New Lexus IS: In Depth

2005 Lexus IS

L-Finesse on the road

November 28, 2005 7:58 PM
Filed Under: Japanese, Lexus

Press Release

Short Version

DESIGN

Following the next generation GS, the new Lexus IS sedan is the second road-going iteration of L-finesse, the unique Lexus design philosophy. Deeply rooted in Japanese culture, this design rationale informs every aspect of the new IS, developing strong visual synergies between the interior and exterior design of the new Lexus.

Combining a wide track and prominent wheel arches with short front and rear overhangs to give the car a low centre of gravity and a broad, muscular stance, the next generation IS marries the elegance of powerful, sweeping coachwork lines with an intriguing contrast of convex and concave surfacing. The resultant purity of overall form is complemented by a substantial reduction in exterior component gaps – in some cases to just 0.35 mm.

On board, a stunning new interior has evolved from the further combination of convex and concave surfaces. Rigorous fit and finish management has reduced, and in some cases eradicated altogether, gaps between interior components, creating an environment of clean, uncluttered luxury unprecedented in this class. Careful consideration has gone into the modelling and spacing of individual components, with a detailed coordination of new, LED interior illumination, chrome highlighting to key touch surfaces such as the steering wheel mounted gear shift paddles, and a bird’s eye maple wood centre console finished by Yamaha’s piano manufacturing craftsmen.

Rear seat legroom has been significantly improved through the addition of 60 mm to the wheelbase of the new Lexus, increasing the distance between front and rear passengers to a class-leading 881 mm. Seating upholstery is available in a choice of standard fabric, sports fabric and perforated, semi-aniline leathe r, double stitched to unprecedented tolerances.

BODY AND CHASSIS

The new Lexus IS is 175 mm longer and 75 mm wider than its predecessor, with a track width increased by 40 mm to the front and 60 mm to the rear. A body shell of 20% higher torsional stiffness combines with an aluminium bonnet, suspension members and powerplants to reduce overall unsprung weight and yaw moment.

With a drag coefficient of just 0.27, the new Lexus IS is one of the most aerodynamically efficient cars in its segment. Smooth, minimal panel-gap bodywork with triple-seal doors and a flush mounted windscreen combine with the use of numerous aerodynamic under-body elements to promote high-speed stability and minimal wind noise, whilst reducing fuel consumption. And comprehensive anti-noise vibration and harshness (NVH) measures, including a floor carpet featuring an absorption-insulation-absorption material sandwich to minimise road noise penetration, ensure ultra-quiet cabin acoustics.

The next generation IS is equipped with new, double wishbone front and multilink rear suspension configurations, which combine legendary Lexus ride comfort with the excellent handling and dynamic abilities appropriate to a dynamic luxury sedan. New, high performance, monotube shock absorbers with an increased piston diameter further improve ride comfort, steering feel, road holding and body control. The IS 250 in Sport specification is equipped with a bespoke suspension configuration featuring stiffer spring and damper settings.

The IS also features a brand new, speed-sensitive, electrically assisted power steering (EPS) system. Key steering parameters have been amended from the current IS model range to create

a quicker, more direct steering feel.

POWERTRAINS

The next generation Lexus IS is offered with a choice of two power plants: a 153 kW/208 DIN hp, 2.5 litre direct injection V6 petrol engine, and Lexus’ first diesel, a 4-cylinder, 130 kW/177 DIN hp, 2.2 litre state-of-the-art unit which will dramatically strengthen Lexus’ position within this highly competitive market segment.

Developing an impressive 400 Nm / 295 lb.ft of torque between 2,000 and 2,600 rpm - a class-leading figure for engines of up to 2.2 litres in this segment - the new 4-cylinde r, 2,231 cc common-rail diesel unit presents an aluminium block and combines an exceptionally high injection pressure of 1,800 bar with one of the world’s lowest diesel engine compression ratios of 15.8:1.

Particular attention has been paid to reducing noise and vibration to the lowest levels, ensuring the new unit fulfils Lexus standards.

The IS 220d will accelerate from 0-100 km/h in 8.9 seconds and on to a top speed of 215 km/h, yet return fuel consumption figures of just 6.3 l/100km in the combined cycle. Equipped with Lexus Clean Diesel Technology, the new powerplant returns NOx and PM emissions of just 0.159 g/km and 0.0019 g/km respectively, easily surpassing EURO IV emissions requirements, and is one of the cleanest diesel luxury cars on the market for combined values of these emissions.

The 2.5 litre V6 petrol engine adopts D-4 direct injection technology to reduce the intake mixture temperature, therefore allowing a higher compression ratio. Furthermore, it employs an electrically activated, 2-stage Acoustic Control Induction System (ACIS) and Dual VVT-i (Variable Valve Timing-intelligent) to significantly ameliorate engine performance and fuel efficiency. When equipped with an automatic transmission, the IS 250 can achieve a maximum speed of 225 km/h, accelerating from 0 to 100 km/h in 8.1 seconds. The combined cycle fuel consumption is 9.1 l/100km.

Both engines are mated to a newly-developed, 6-speed manual transmission. A shorter differential gear ratio is fitted as standard to the new IS 220d in Sport specification, for an average 30% improved in-gear acceleration. And the new V6 unit may be mated to an optional 6-speed automatic transmission featuring sequential, steering-mounted, paddle-shift control.

SAFETY

The new Lexus IS offers the highest content of sophisticated, safety technology available in this segment, including Lexus’ state-of-the-art Vehicle Dynamics Integrated Management (VDIM) and Pre-Crash Safety (PCS) systems, as well as the world’s first SRS twin-chamber passenger airbag.

The new Pre-Crash Safety system (PCS) available on the IS 250 uses a millimeter-wave radar sensor to detect obstacles in front of the car and to determine, in advance, whether a collision is unavoidable. If the system determines that this is the case, it will pre-emptively activate the Pre-Crash front seatbelt pretensioners and simultaneously prepare the emergency Brake Assist system for optimum efficiency once the brake pedal is depressed. Complimentary to the PCS system, Adaptive Cruise Control (ACC) can automatically match the speed of the vehicle in front and, once the road ahead is clea r, accelerate back up to the selected cruising speed.

The Vehicle Dynamics Integrated Management system employs brake pressure, steering angle, torque steer, yaw rate, longitudinal and lateral acceleration, and vehicle speed sensors to fully integrate the new IS’ Anti-Lock Brakes (ABS), Traction Control (TRC), Vehicle Stability Control (VSC) and Electric Power Steering (EPS) systems. VDIM has been designed to activate before the limit of the vehicle’s performance envelope has been reached, not only greatly improving active safety, but also promoting smoother ‘on-the-limit’ vehicle behaviour through unobtrusive intervention and, hence, a more rewarding drive.

Within a highly rigid, extensively reinforced body structure, a host of airbags are fitted as standard, including driver and passenger SRS knee airbags and the world’s first SRS twin chamber front passenger airbag, which offers improved protection to sensitive facial areas. The new IS further benefits from second generation WIL (Whiplash Injury Lessening) front seats and swivelling, bi-xenon, Intelligent Adaptive Front Lighting (I-AFS) for both low and high beam, featuring 4-bulb high beam lamps.

INTERIOR REFINEMENT AND TECHNOLOGY

With a choice of three equipment specification grades, carefully considered to simplify and enhance life on board, and several new, leading-edge technologies, the next generation IS offers high levels of interior luxury and practical innovation.

The entry level model boasts a comprehensive standard equipment package including a Smart Keyless Entry System, driver and passenger front and knee airbags, side airbags and curtain shield airbags, electronic climate control, electric windows and electric, heated door mirrors, windscreen de-icing, sequentially illuminated LED entry lighting, Optitron instrument lighting, a 13 speaker stereo system with a 6-CD in-dash autochanger and 16" alloy wheels. Both Sport and Luxury specifications further include sports fabric or full leather power adjusted, heated and ventilated front seats, electrochromatic interior and door mirrors, bi-xenon I-AFS headlamps, Lexus Parking Assist Sensors (front and rear), wood trim (only on Luxury specification) and 17" or 18" alloy wheels.

This class-leading range of standard equipment may be further supplemented by numerous, unique, high technology options, including the Lexus Multimedia and Navigation System. It comprises the new Lexus navigation system, the Mark Levinson® Premium Surround Sound System and the Lexus Parking Assist Monitor.

The new Lexus navigation system, premiered in the Lexus IS, features 3-language voice activation, and combines 7", 32,000 colour range, LCD touch screen technology with voice guidance in 10 languages. BluetoothTM connectivity is integrated into the system for hands-free mobile phone operation.

For those wanting the best in automotive infotainment, a new Mark Levinson® premium surround sound system, unique to the Lexus IS range, features a 10 channel, 300-Watt RMS (Root Mean Square) amplifier and 14 speakers, including the company’s first use of a 200 mm inverted subwoofer. It utilises Mark Levinson® Surround (MLS) audio software to reproduce ‘discrete’ 5.1 sound, via a surround sound 7.1 channel speaker topography, from both stereo CD and 5-channel DVD source material.

The Lexus Parking Assist Monitor features a video camera mounted in the rear number plate surround that projects a full colour rear view of the surroundings. Even greater manoeuvring accuracy is promoted by screen-generated guidelines which indicate the prospective path of the vehicle based on the current steering position.

Long version

DESIGN & EXECUTION

Representing a new design approach implemented for the first time in the next generation GS, the new IS dynamic sedan is the second road-going iteration of L-finesse, the unique Lexus design philosophy.

Integral to Lexus’ ceaseless quest for perfection, L-finesse is a ground-breaking design strategy deeply rooted in Japanese culture, with references drawn from the timeless heritage of true Japanese design iconography, both ancient and modern. L-finesse informs every aspect of the next generation IS, its complex rationale not only reflected in both the interior and exterior design of the new Lexus, but also in the development of strong visual synergies between the two.

EXTERIOR DESIGN

The next generation IS marries the elegance of powerful, sweeping lines with an intriguing contrast of convex and concave surfacing which reinforces the central tenets of the L-finesse philosophy. The resultant purity of overall form is complimented by a substantial reduction in exterior component gaps – those between bumpers and adjacent body panels having been reduced to just 0.35 mm.

To the front, a trademark, vertically latticed grille instantly identifies the new IS as a dynamic member of the Lexus marque; its wide track and prominent wheel arches combine with short front and rear overhangs to give the car a low centre of gravity and a broad, robust yet sophisticated appearance. The aggressive, twin-barrel headlamp clusters are positioned on a higher plane than the grille itself. This carefully considered disposition of the key frontal elements will become a unique characteristic of future Lexus models, focusing the eye at the very apex of the vehicle to strengthen the impression of speed and agility.

In profile, tight shoulders and a wide side surface support a steeply raked windscreen and a “C” pillar glazing motif inspired by “Kirikaeshi”, a symbol of traditional Japanese culture that expresses dynamism through a rapid, yet fluid change of direction, creating an analogy to Japanese calligraphy or the movement of a Samurai sword. This strong “arrowhead” motif will become a key future styling element to the Lexus marque.

Astern, splayed rear wheel arches taper into a short rear overhang topped with powerful LED lamp clusters. The unique sporting design graphic of the rear lamp cluster reflects an elegance central to the L-finesse philosophy, and once more sets a precedent for the styling of future Lexus models. The IS’s widespread adoption of external LED illumination to stop, clearance and licence plate lights not only provides a sharper, more refined light source, but also increases lamp life and promotes energy saving – 50% in the case of license plate illumination.

The next generation IS will be available in a range of ten colours, of which two are exclusive to this model. Four ‘character’ premium quality paint finishes have been specifically developed to embody the Lexus L-finesse design philosophy reflected in the exterior styling: Glacial Blue has an enhanced brilliance under strong sunlight, Ice Blue emphasises the contrasts in convex and concave surfacing, Desert Sage Green, unique to the new Lexus IS, offers subtle changes in hue reflecting the maturity of a Lexus saloon, and Morello Red, a wet, glossy look with outstanding depth, is a multi-layer finish employing aluminium for the first base coat and artificial mica for the second, resulting in highlight brilliance and a greater change of colour intensity from highlight to shade.

The IS grille generates a powerful coachwork line which highlights the clean muscular bonnet surface before sweeping seamlessly into the windscreen pillar. An adjacent concave surface stretches between bonnet and wheel arch to reinforce the car’s wide, dynamic front stance, and is punctuated by a new, sporting, door-mounted mirror design as it flows into the narrowing belt line.

INTERIOR DESIGN

On board, the L-finesse design philosophy is perfectly reflected in a stunning new interior, which once more combines convex and concave surfaces; the former denoting control functions such as the centre console switchgear and engine start button, the latter accommodating driver and passengers. The seamless, dynamic flow of the door panel surfaces into the dashboard culminate with the projecting instrument binnacle, the focal point of the new IS cabin.

The vertical linking of cabin elements through the centre console and door grips, once again inspired by the “Kirikaeshi” principle, further reinforce the volumetric homogeny of the interior design, whilst the apparently dislocated position of the side air vents reflects the influence of another symbol of Japanese traditional culture, “Hazushi”, or “shift out of phase”. This expresses the intriguing notion of something that is part of a whole but, at the same time, retains its independence.

A combination of high quality slush moulding and vacuum forming production processes have been adopted for the upper and lower dashboard, as well as the door trim panels. These soft-touch components are finished in a new, scratch resistant natural grain pattern which enhances the visual, tactile and acoustic refinement of the new IS interior. A black, upper dashboard finish may be combined with a choice of three lower dashboard colours: matching black, frosty grey or ivory.

Rigorous fit and finish management has reduced, and in some cases eradicated altogether, gaps between interior components, creating an environment of clean, uncluttered luxury unprecedented in this class. And careful consideration has gone into the modelling and spacing of individual components, with a detailed coordination of both interior illumination and finishes to touch surfaces such as the chrome highlighting to door handles, gear shift paddles, gear knob and starter button.

Used in conjunction with conventional, incandescent bulb lighting, brighter, more focused LED illumination to front and rear map reading lights, front passenger footwell and gear lever puddle lighting adds an enhanced elegance to the after-dark ambience of the new Lexus’ interior. Luxury specification IS models further feature unique, blue LED illumination to the stainless steel front door scuff plates.

Also unique to the IS Luxury specification, the centre console is finished in bird’s eye maple wood. Only 1% of global bird’s eye maple supplies meets Lexus’ exacting standards, and it takes more than three weeks to select, process and finish the wood. Sourced from sustainable plantations in Canada, the centre console panel is laminated to an aluminium backing plate to ensure optimum rigidity before being cut into three component parts for the manufacture of the main panel, ashtray lid and storage compartment lid. This approach, though time consuming, ensures absolute visual consistency of the finished console.

The finishing process is carried out by Yamaha ’s piano manufacturing craftsmen. Yamaha has

a 40 year long tradition of preparing wood for automotive interiors, dating back to 1966 when the company supplied its first real wood components to the Toyota Motor Corporation. The bespoke, patented process involves the 20 step, multi-coating application of lacquers to the centre console, resulting in an ultra high-gloss, scratch resistant finish.

The new steering wheel features a redesigned rim cross-section for added comfort, and the gear shift paddles are mounted directly on the steering wheel, eliminating the need to modify steering wheel grip, even when cornering.

The front seats combine snug lateral support with a broad shoulder area, reflecting the optimum balance of ride comfort and driving dynamics inherent in the new IS chassis. Rear seat legroom has been significantly improved through the addition of 60 mm to the wheelbase of the new Lexus, increasing the front-rear couple distance to a class-leading 881 mm.

IS seating upholstery will be available in standard fabric for entry level models, sports fabric for the Sports specification, and perforated, semi-aniline leather for Luxury grade models.

Employing a technique favoured by bespoke furniture makers, Lexus semi-aniline leather receives a supplemental top coating of highly dispersed pigments and dyes. By dyeing the leather throughout before this final surface coating, a particularly even colouration is achieved with only a thin finishing layer, whilst the leather itself remains significantly softer. Moreove r, the use of smaller, non-visible stitching holes allied to significantly tighter tolerances in the leather’s double stitching – now reduced by 17% - results in a particularly clean appearance.

Further examples of Lexus’ comprehensive attention to detail may be found throughout the new IS interior. For example: The over-door assist grips now feature a unique, twin articulation axis design which combines a flush storage position with greatly improved user ergonomics. Both front and rear door ends are visually enhanced by a black resin cover to the panel and attachment bolts, and the floor mounted, front seat rails have also been covered to give a cleaner appearance and offer additional safety to rear seat passengers.

BODY & CHASSIS

With a body shell of high torsional stiffness, featuring aluminium bonnet, suspension members and powerplants to reduce overall weight, the next generation IS is wider and lower than its competitors. The resultant low centre of gravity combines with a sophisticated suspension system and new electric power steering to afford the next generation Lexus a dynamic driving performance without compromising the marque’s legendary ride quality.

Smooth, minimal panel-gap bodywork and the use of numerous aerodynamic under-body elements combine to promote high-speed stability and minimal wind noise, whilst reducing fuel consumption. And comprehensive anti-noise vibration and harshness (NVH) measures ensure the reduction of external noise intrusion to a minimum, for ultra-quiet cabin acoustics.

BODY SHELL

Based on a new, luxury saloon platform which it shares with the latest generation GS range, the new Lexus IS is 175 mm longer and 75 mm wider than its predecessor, with a track width increased by 40 mm to the front and 60 mm to the rear.

Excellent torsional stiffness, increased by 20% over the current model, is achieved through the extensive use of high tensile steel sheeting throughout the bodyshell, allied to a brace installed between the frontal attachment of the rear sub-frame and the front floor reinforcement. Transverse rigidity is further improved through the pipe brace interconnection of the new bracing members.

Moreover, the bonnet, main powerplant components and diverse suspension elements are all fabricated in aluminium to reduce yaw moment and unsprung weight, therefore enhancing the agility of the new Lexus IS.

AERODYNAMICS

With a drag coefficient of just 0.27, the new Lexus IS is one of the most aerodynamically efficient cars in its segment. The sleek, flowing bodywork boasts exceptionally narrow panel gaps and minimal protrusions. Flush bonnet, headlight and windscreen surface surrounds minimise airflow separation, whilst door mounted mirrors reduce air turbulence adjacent to the ‘A’ pillar. Astern, a duck-tail lip to the boot lid trailing edge and an “air-kick” detail moulded into the tail lamp clusters ensure a clean passage of air to further reduce drag and turbulence.

A deep front spoiler, side skirts, front and rear tyre fairings, and covers to the cabin floor, transmission, fuel tank and rear suspension create the smoothest, flattest possible surface to enhance high-speed vehicle stability and reduce wind noise to a minimum. Furthermore, a new engine undercover has been designed to create a Venturi effect, which generates downforce to ensure a 0 lift coefficient at high speeds, whilst a rear floor diffuser features twin vertical fins - in the manner of racing sportscar undertrays - to reduce the rear lift coefficient and bolster high speed handling stability.

NVH (NOISE VIBRATION AND HARSHNESS)

Particular attention has been paid to the reduction of external noise intrusion and the acoustic characteristics of the new IS’s cabin. An abundance of sound absorbent and insulating materials located throughout the interior envelope includes newly developed, foam-type asphalt sheeting to further reduce weight. Rubberised underbody floor covers and sound absorbing, Polyethylene Terephtalate felt and Styrene-Butadiene rubber resin rear wheel arch liners combat noise intrusion from water and gravel splatter. The floor carpet features an absorption-insulation-absorption material sandwich to minimise road noise penetration.

The detailing of external bodywork seals, weather strips and door and window frame mouldings contribute to greatly reduced wind noise. Triple seals have been adopted for all four doors, with additional door sill seals to eliminate air ingress. A rubber seal is fitted around the entire bonnet rim, and flush mounted mouldings to the windscreen and door glazing further combat wind noise. The windscreen itself is equipped with an acoustic inner film boasting high noise damping characteristics, leading to a cabin noise reduction of up to 4 dB at idle.

In a further example of Lexus’ attention to detail, unique, perforated, sound absorbent sun visors have been incorporated, their proximity to passengers heads resulting in a significant reduction in wind noise from windscreen head and “A” pillars.

SUSPENSION

The new Lexus IS is equipped with a double wishbone front and multilink rear suspension configuration which combines legendary Lexus ride comfort with the excellent handling and dynamic abilities.

Front Suspension

The front, high-mount, double wishbone suspension system combines a lightweight, forged aluminium knuckles with a high tensile steel lower arm and a hollow anti-roll bar to reduce unsprung weight.

The new suspension configuration features a 35% higher camber angle than that of the current IS, which improves steering wheel centring, enhances negative camber to the outside wheel when cornering, and improves steering feedback. An 18% higher kingpin angle improves straight line stability, a 10% increase in caster trail promotes a more stable steering feel, and a 22% reduction in roll centre height provides improved cornering stability with reduced body roll.In addition, new, forward mounted power steering gear allied to low toe variation along the suspension stroke promote a more linear yaw response, precise steering control and excellent straight line, high speed stability.

Rear Suspension

To the rear, an advanced multilink set-up with toe control arms and an aluminium rear axle carrier combines stiffer suspension component materials with a reduction in unsprung mass for excellent ride comfort with high cornering stability. The adoption of a double-linked upper arm and integrated bearings and hub combines optimised geometry and high rigidity with significant weight reduction.

The utilisation of a multilink configuration facilitates the optimum balance of handling, stability and ride comfort: The upper arms contribute to a reduction in upward spring motion, the mid-arm contributes to reduced body roll, and the lower arm provides an improved anti-lift / anti-squat ratio. Moreover, aligning the shock absorbers along the same, lower axis as the coil springs facilitates a wider boot loadspace.

SHOCK ABSORBERS

The next generation Lexus IS features new, high performance, monotube shock absorbers. The new monotube configuration also dissipates heat more efficiently, resulting in better control and a reduction in high-use fade.

A large, 45 mm piston diameter offers a sharper shock absorber response to any vertical wheel movement, a new fluid and oil seal design combine to provide greater damping force under smaller compression, and a pyramidal valve stack design reduces damping force under high piston velocity – reducing impact shock when, for instance, the vehicle drives over a bump at high speed.

Large diameter, liquid-filled bushing to the lower suspension arm further reduces the transmission of vibration, and rebound springs are incorporated in all four shock absorbers to control roll angle in extreme situations.

The IS 250 Sport is equipped with a bespoke suspension configuration featuring stiffer spring and damper settings that also decrease ground clearance by 10 mm. This further reduces body roll and improves handling characteristics.

ELECTRIC POWER STEERING (EPS)

The next generation IS features a brand new, speed sensitive, electrically assisted power steering (EPS) system. It is superior to comparable hydraulic systems in offering perceptible fuel savings, noise free operation and, through the location of the steering gearbox ahead of the front axle, smooth, linear feedback to the driver. Both the DC motor and reduction mechanism are now built into the ultracompact steering gear housing.

The system’s electric motor uses 42 V AC current for more prompt response to steering inputs. Unlike conventional systems, wherein power assistance is determined solely by vehicle and engine speed, the Lexus IS’s EPS also registers steering angle and torque in calculating the degree of assistance required at any time.

Key steering parameters have been amended from the current IS model range to create a quicker, more direct steering feel. The number of turns lock-to-lock had been reduced from 3.00 to 2.91, and the gear ratio has been simultaneously reduced from 14.5 to 13.5. Furthermore, the new IS delivers a class-leading turning circle of 5.1 m.

In IS models fitted with Lexus’ unique active safety system, Vehicle Dynamics Integrated Management (VDIM), EPS is incorporated within the system to promote smoother “on-the-limit” vehicle behaviour through unobtrusive intervention. Via the EPS actuator, VDIM will provide steering assistance to reduce torque steer under braking on surfaces of varying grip, as well as introducing steering torque assistance in both understeer and oversteer conditions, helping the driver to optimise the front wheel steering angle and maintain vehicle stability with minimum input. Unlike conventional stability control systems which simply correct the vehicle’s trajectory when under or oversteer are detected, VDIM acts in anticipation of these dynamic thresholds with a discrete and smooth intervention designed not to detract from performance driving pleasure.

BRAKES

The new Lexus IS features powerful, 298 x 28 mm ventilated front and 291 x 10 mm rear disc brakes throughout the range. A new, brake-fade pressure compensation system constantly monitors brake performance by comparing brake pedal effort with vehicle deceleration, applying additional pressure to minimise the effects of brake fading. In addition, a stiffer brake hose material displays lower distortion under pressure for improved braking feel, and new, high friction coefficient brake pads further increase the IS’s braking efficiency.

A new, link-type variable ratio brake pedal provides a progressive action combining optimum low-deceleration feel with maximum high-deceleration power.

Via this new brake system, the next generation IS deploys a comprehensive range of active safety braking functions: Anti-lock Brakes (ABS), Traction Control (TRC), Vehicle Stability Control (VSC), Brake Assist System (BAS), Electronic Brake-force Distribution (EBD) and Hill-start Assist Control (HAC). In models equipped with automatic transmission, HAC allows the IS to pull away smoothly on a gradient without rolling backwards - this is achieved by maintaining brake pressure for five seconds after the brake pedal has been released.

IS models fitted with Vehicle Dynamics Integrated Management also benefit from VDIM’s integrated activation of these braking, stability and traction control systems, further improving the overall dynamic performance of the vehicle.

WHEELS AND TYRES

The new Lexus IS will be available with a choice of bespoke, 16", 17" and 18" alloy wheels, determined by the model range specification.

Vehicles featuring 18" wheels are fitted with wider 255/40 R 18 Dunlop SP Sport Maxx tyres at the rear, specially developed for the Lexus IS to provide superior grip under all road surface conditions.

The next generation Lexus IS is offered with a choice of two power plants: a 153 kW / 208 DIN hp, 2.5 litre direct injection V6 petrol engine, and Lexus’ first diesel, a 4-cylinder, 130 kW / 177 DIN hp, 2.2 litre state-of-the-art unit which will dramatically strengthen Lexus’ position within this highly competitive market segment.

Both engines are mated to a newly-developed, 6-speed manual transmission. The new V6 unit may be mated to an optional, 6-speed automatic transmission featuring sequential, paddle-shift control.

POWERTRAINS

2.2 LITRE DIESEL

Fulfilling the most exacting standards of Lexus refinement, the new 4-cylinder, 2,231 cc common-rail diesel unit features an aluminium block to optimise weight saving and driving dynamics in the new IS 220d. The engine includes several unique design features and, as befitting the marque, particular attention has been paid to reducing noise and vibration to levels unprecedented within a diesel engine.

The new Lexus diesel generates 130 kW / 177 DIN hp at 3,600 rpm and an impressive 400 Nm / 295 lb.ft of torque between 2,000 and 2,600 rpm. The IS 220d will accelerate from 0-100 km/h in 8.9 seconds and on to a top speed of 215 km/h, yet return fuel consumption figures of just 6.3 l/100km in the combined cycle.

Integrating 3rd generation common-rail technology with piezoelectric injectors, the new Lexus powerplant combines an exceptionally high injection pressure of 1,800 bar with one of the world’s lowest diesel engine compression ratios of 15.8:1. A low compression ratio reduces the compression build-up inside the large diameter combustion chamber, minimising the noise and vibration attendant to each explosion and eliciting exceptionally quiet combustion.

Via high-flow, high speed injectors featuring 10 holes with a 0.13 mm nozzle diameter, the common rail system can produce up to 5 separate injections per cycle.

The new Lexus diesel features several additional anti-noise and vibration measures: The adoption of a balancer shaft within the unit offers significant reduction in engine “booming” noise between 2,000 and 3,000 rpm. A urethane engine cover and three-layer heat insulator combine with urethane spacers on the upper surface of the inlet manifold, oil cooler backside and oil pan rear to further curtail engine noise. A variable back-pressure exhaust system minimises exhaust sound at low speeds, and incorporates twin ball joints to minimise vibration and cabin noise intrusion.

These numerous NVH reduction measures reward the new Lexus IS 220d with a particularly quiet cabin environment, delivering an Articulation Index - measured through the use of random words in conversation - superior to that of many petrol fuelled powerplants.

The new 2.2 litre diesel is further equipped with Lexus Clean Diesel Technology, a package of innovative features that aim to reduce emissions substantially below EURO IV requirement levels. Key to this technology is the Diesel Particulate NOx Reduction (DPNR) 4-way catalytic converter - the only catalyst in the world that reduces NOx and PM (particulate matter) simultaneously. With NOx and PM emissions of respectively 0.159 g/km and 0.0019 g/km, the Lexus IS 220d is one of the cleanest diesel luxury cars on the market for combined values of these emissions.

2.5 LITRE V6 PETROL

The new, chain-driven double overhead camshaft, 24 valve, 2,500 cc V6 petrol engine features a compact design and reduced weight (180 kg service mass). Being no heavier than the current IS 2.0 litre powerplant, the new 2.5 litre V6 employs an aluminium die-cast cylinder block and intake manifold, and a resin-made intake chamber. The overall engine assembly is made lighter and more compact through the installation of the water and oil pumps within the chain cover.

Featuring direct injection technology which affords this unit the highest injection pressure amongst petrol engines (130 bar), it develops 153 kW / 208 DIN hp at 6,400 rpm and

a class-leading 252 Nm / 186 lb.ft of torque at 4,800 rpm, awarding the new Lexus IS 250 performance figures of 0-100 km/h in 8.4 seconds and a top speed of 230 km/h. The highly sophisticated 2.5 litre unit returns 9.8 l/100 km (9.1 l/100 km for models equipped with automatic transmission) in the combined cycle.

The new V6 also employs an electrically activated, 2-stage Acoustic Control Induction System (ACIS). This system divides the intake manifold into 2 sections, with an intake air control valve in the bulkhead opening and closing to vary the effective length of the intake manifold in accordance with the engine speed and throttle valve angle. This increases the power output in all ranges from low to high speed. The ACIS electric actuator is bonded to the plastic intake chamber through an advanced laser welding process.

Swirl Control Valves (SCVs) are installed in the intake manifold -one per cylinder. Via optimised intake port diameter and length, SCVs stabilise combustion at a low coolant temperature and allow the generation of high torque at low rpm.

The adoption of Dual VVT-i (Variable Valve Timing-intelligent) to both intake and exhaust camshafts also significantly ameliorates engine performance. Able to control intake and exhaust camshafts through angles of up to 40 and 35 degrees respectively, Dual VVT-i allows a greater intake/exhaust valve overlap, benefiting both low-end and top-end torque as well as contributing to a reduction in exhaust emissions and better cold-start performance.

Roller rocker arms have been adopted for the chain-driven valve system, the marked reduction in friction between the cam and sliding components helping enhance fuel efficiency. In addition, a concave camshaft profile increases valve lift to boost output. The system requires no valve clearance adjustment over the life of the vehicle. All exhaust components are fabricated in stainless steel. The adoption of a dual-tube exhaust manifold construction enhances corrosion resistance whilst reducing both heat-loss and noise. In comparison with the current IS 300 exhaust system, enlarged dual main mufflers with variable back-pressure valves and a long-tail structure both reduce low-frequency booming noise - 7dB less at 1,200 rpm - and reduce high rpm back-pressure by 30% to enhance engine output.

TRANSMISSIONS

Both diesel and petrol engined versions of the new Lexus IS are mated to a compact, accurate, 6-speed manual transmission featuring multi cone synchronisers to reduce shift effort, slide ball bearings in the gear lever shaft and fork shaft to improve shift efficiency, a triple synchro mechanism from 1st to 3rd gears to enhance shift feel, and a shift guide plate to decrease post-shift transmission play.

The IS 220d features a quiet, durable driveline adopted from the Lexus LS 430 and further enhanced by a liquid-filled differential mount for improved vibration damping. Models equipped with 18" wheels (standard in Sport specification and optional in the Luxury grade) feature a shorter differential gear ratio which improves in-gear acceleration by an average of 30%.

As well as the standard 6-speed manual transmission, the ultra-smooth Lexus V6 may be mated to a new 6-speed automatic transmission featuring sequential, paddle-shift control. Activated by simply selecting ‘S’ in the gear lever gate, the gear shift paddles are mounted directly on the steering wheel, eliminating the need to modify steering wheel grip, even when cornering. In addition, gear range selection can also be performed through the conventional gear lever. Providing a faster downshift than fully automatic mode, the sequential mode allows for greater driver involvement, allowing exploitation of the new Lexus’ dynamic abilities to the full.

This transmission adopts 3 planetary gear units, 4 clutches and 4 one-way clutches. A new clutch-to-clutch shift control is adopted between 5th and 6th gears, eliminating the one-way clutch between them to both save weight and facilitate a more compact design. An Artificial Intelligence (AI-SHIFT) control automatically changes the gear shifting schedule according to road conditions and driving style.

While an enhanced lock-up timing control can improve fuel consumption in 5th and 6th gears, an automatic transmission fluid warmer further benefits fuel economy during cold starts.

SAFETY

ACTIVE SAFETY

Pre-Crash Safety (PCS)

The next generation IS 250 offers a sophisticated Pre-Crash Safety system (PCS) that can help reduce collision damage and injury. The PCS system features a millimetre-wave radar sensor, operating within a 20 degree scanning amplitude to detect obstacles in front of the car to a range of 150 m, even during cornering. Via numerous sensors, the Pre-Crash system computer monitors vehicle speed, steering angle and yaw rate inputs to help determine in advance whether an impending collision is unavoidable. In such an eventuality, the system pre-emptively activates the Pre-Crash seatbelt pretensioners, retracting all slack from the front belts, and simultaneously adjusts the Emergency Brake Assist system to provide maximum braking force once the brake pedal is depressed. In addition, at vehicle speeds in excess of 15 km/h, PCS will also activate in case of severe under and oversteer, or during emergency braking.

Adaptive Cruise Control (ACC)

Complementary to the PCS system, the new IS 250 also features an Adaptive Cruise Control (ACC) system. The system offers two modes: constant speed control, and vehicle-to-vehicle distance control. The constant speed control functions in the manner of a conventional cruise control system. Capable of differentiating between vehicles directly ahead of the Lexus and those in an adjacent lane, the vehicle-to-vehicle distance control system employs the PCS millimetre-wave radar sensor, allied to constant speed, decelerator, follow-up and accelerator controls, to automatically slow the IS, match the speed of the vehicle in front and, once the road is clear ahead, accelerate to the previously selected cruising speed.

Via a steering wheel mounted switch, the driver can select long, middle or short vehicle-to-vehicle distances. The system control settings are indicated on the IS’s Multi-Information Display.

Vehicle Dynamics Integrated Management (VDIM)

The new IS 220d features Lexus’ unique, state-of-the-art Vehicle Dynamics Integrated Management (VDIM) system to enhance performance, traction control and vehicle stability. With comprehensive status data provided by sensors throughout the vehicle, VDIM integrates the IS’s Anti-Lock Brakes (ABS), Electronic Brake-force Distribution (EBD), Traction Control (TRC) and Vehicle Stability Control (VSC) active safety systems with the Electric Power Steering (EPS).

By the application of integrated control of all the elements related to vehicle movement, including engine torque, brakes and steering, VDIM not only optimises the activation of braking, stability and traction control systems, but is also able to further improve the overall kinetic performance of the vehicle.

Moreover, whereas conventional active safety systems are only activated immediately after a limit of the vehicle’s dynamic envelope has been reached, VDIM activates control before that limit is realised. As a result, the limits of the vehicle’s dynamic threshold have been expanded, whilst offering smoother vehicle behaviour at this threshold through less obtrusive

intervention and, hence, a more pleasurable drive.

When braking in a corner, for example, a loss of rear tyre grip may result in oversteer. Through the Electronic Brake-force Distribution function, the use of linear brake actuators makes it possible to begin control before the vehicle’s limit has been reached. The VDIM system apportions the appropriate braking force to each wheel, ensuring continued vehicle stability by pre-emptively restraining the spinning tendency, whilst contributing to superior braking performance.

Under even stronger braking in a corner, front wheel lock-up and loss of grip may result in understeer. By once again independently controlling the braking force to all four wheels via the EBD system, VDIM helps to prevent front wheel lock-up and regain vehicle balance, offering seamless control.

Moreover, via the EPS actuator, VDIM will augment Vehicle Stability Control operation by providing steering assistance to reduce torque steer under braking on surfaces of varying grip, as well as introducing steering torque assistance in both understeer and oversteer conditions, helping the driver to optimise the front wheel steering angle and maintain vehicle stability with minimum input.

Intelligent Adaptive Front-lighting (I-AFS)

The new IS is fitted with Lexus’ Intelligent Adaptive Front-lighting System (I-AFS), which swivels one projector (covering both high and low beam functions) of the xenon headlamps through up to 15 degrees, helping to illuminate a bend as the driver steers into it. The new, bi-xenon headlights now incorporate four high-beam bulbs, widening the high beam illumination pattern from mid to long range. And an electro-mechanical shutter provides the sharpest possible upper pattern cut-off to low beam illumination.

PASSIVE SAFETY

Body Structure

Reflecting stringent car-to-car impact compatibility standards unique to the Lexus marque, the highly rigid bodyshell of the next generation IS range features numerous structural reinforcements to enhance its collision performance.

A new, octagonal section, front side member crash-box improves energy absorption within a shorter front overhang construction. The inner door reinforcements have been strengthened, and the gap between the inner door panel and the ‘B’ pillar reduced. This more effectively communicates the impact load to the door belt line reinforcement, reducing the load to the pillar in the event of an offset frontal collision.

Delivering improved side impact protection, the ‘B’ pillar itself has been reinforced, whilst the use of high tensile steel for both the bulkhead inside the rocker and the cross-member reinforcement further optimises structural stiffness. The integration of enlarged roof reinforcement with the front pillar reinforcement rear-end joint and the rear pillar reinforcement front-end point helps reduce roof rail cabin intrusion in the event of a side impact. Furthermore, passenger seat-base rod

reinforcement effectively disperses side impact energy throughout various adjacent body areas such as the floor tunnel upper bracket, reducing vehicle body deformation in the immediate proximity of the seats.

Internal tests suggest the new IS 220d / 250 has the potential to achieve 5 stars in the Euro NCAP adult occupant rating.

Car-To-Car Compatibility And Roll-Over Tests

The IS 220d / 250 is the first Lexus to be developed according to the company’s own, more stringent, car-to-car compatibility crash-test standards. Previously enacted at 50 km/h, these tests now comprise a 55 km/h frontal collision involving a 2-ton vehicle (50% overlap impact, both vehicles moving at the same speed), a 55 km/h side impact from a 2-ton vehicle, and a rea r, 50% overlap crash, again involving a similar vehicle. The 5 km/h speed increase represents an additional 20% impact energy. In addition, the new model has also undergone rigorous roll-over testing.

This stringent test programme ensures the new Lexus IS’s class-leading passive safety technology affords optimum passenger protection in the most comprehensive diversity of real-world situations.

Airbags

Driver and passenger knee airbags make a first appearance in this segment. New, enlarged, front seat side SRS Torso Abdomen Pelvis (TAP) airbags are 30% bigger than previous designs, and curtain airbags run the full length of the interior. Of the two dual-stage Supplemental Restraint System (SRS) front airbags, the passenger airbag is of a twinchamber design making its world debut in the new Lexus.

The SRS twin chamber airbag features an advanced shape based on the Lexus Omni-Support concept. Once inflated, the twin chambers create a depression in the centre of the airbag, effectively cradling areas of the face such as the nose and mouth, whilst allowing the physical impact of the bag to be dispersed across numerous other, head and shoulder, body contact points.

Whiplash Injury Lessening (WIL) Seats

Allied to seatbelt pretensioners and force limiters to both front and rear outer seats, and a rear seatbelt guide to provide better comfort and belt fit for children, the new Lexus IS also features the second generation Whiplash Injury Lessening (WIL) seat concept. The revised system features a new seat back structure and headrest design. The new headrest is designed to sit as close as possible to the passenger’s head during normal use, whilst, in the event of a rear impact, the lower seat back pushes backwards, effectively closing the gap between occupant head and headrest, and significantly reducing the risk of whiplash through excessive head movement.

INTERIOR REFINEMENT & TECHNOLOGY

The class-leading range of bespoke standard equipment available to Lexus IS owners may be further supplemented by numerous, ground-breaking, high technology options, including Europe’s most advanced navigation system, and a unique Mark Levinson® Surround System, for the on-board reproduction of “discrete” 5.1 home theatre DVD entertainment.

The new luxury sedan offers a choice of three equipment specification grades: Standard, Sport and Luxury. Even the entry level Lexus IS boasts a comprehensive standard equipment package, including the following:

STANDARD SPECIFICATION

LUXURY SPECIFICATION

SPORT SPECIFICATION

SMART KEYLESS ENTRY SYSTEM

The 3rd generation Smart Keyless Entry System is fitted as standard across the new IS range, allowing for the deletion of a key slot from the dashboard. The system allows the driver to leave the new, lighter, more compact Smart Key in a pocket throughout any drive. When the Smart Key comes within 0.7-1 metres of the locked door, the key communicates with a transmitter built into the door handle and matches ID codes, whereupon a touch of the handle either unlocks or locks the door. The key also automatically activates the IS’s sequential entry illumination, first switching on the door mirror puddle lights, followed by the cabin interior dome lighting. On board, the Smart Key ID is again automatically recognised, and the engine may be switched on via a push-start button without further use of the key. Each IS is provided with two Smart Keys for different drivers. These may be programmed to store the preferred settings of each driver, such as electrically adjustable seat and steering wheel positioning. The system’s ECU may also be programmed to unlock one, two or all four doors via one press of the Smart Key. The new IS may not be locked if the Smart Key is detected within the cabin or boot, and a warning message is posted on the Multi-Information Display when the Smart Key battery runs low.

ELECTRONIC CLIMATE CONTROL

Employing a variable-displacement compressor for optimum quietness and efficiency, the next generation IS’s electronic climate control offers independent left and right temperature adjustment, as well as automatic control of upper and lower cabin air zones, humidity sensor and automatic cool air bypass control.

The air intake is isolated from the engine compartment to reduce engine noise intrusion, and an automatic recirculation mode (on IS 250 only), linked to NOx detection, prevents the ingress of exhaust gases into the cabin. Furthermore, a switchable, face-vent pollen removal filter operates with an efficiency of 97%, minimising the infiltration of airborne allergens to the cabin.

OPTITRON INSTRUMENTS

The sculpted driver’s instrument binnacle features the precision and depth of white, backlit, second generation Optitron technology. Rev counter and speedometer needles feature a progressive illumination system, activating with a full-dial sweep, and are backed by secondary amber sweep rings indicating manual settings for speed limiter as well as optimum gear shift revs, respectively. A red ring will light up in the tachometer if the engine speed reaches the rev limit.

PREMIUM HI-FI

In keeping with legendary standards already established by Lexus in the field of in-car high fidelity, the standard IS sound system features a magazine-less, 6-disc, in-dash CD changer and steering wheel mounted audio control switches fitted as standard. The stereo speaker system utilises 13 individual speakers, including a slim subwoofer mounted in the parcel tray. Every door houses a 3-way speaker configuration featuring a tweeter, woofer and mid-range unit for clear, full-range sound throughout the interior.

The CD system is equipped to play MP3 and WMA (Windows Media Audio) music files, and includes a mini-jack socket to enable a portable music player to be plugged directly into the car stereo system.

LEXUS MULTIMEDIA AND NAVIGATION SYSTEM

The Lexus Multimedia and Navigation System features a unique, Mark Levinson® Premium Surround Sound System, the new Lexus Navigation System and, in addition, the Lexus Parking Assist Monitor.

For those wanting best-in-segment on-board infotainment, a new Mark Levinson® Surround System, unique to the new Lexus IS, features a 10 channel, 300-Watt RMS (Root Mean Square) amplifier and 14 loudspeakers, including the company ’s first use of a 200 mm inverted subwoofer. It utilises Mark Levinson® Surround (MLS) audio software and an all digital signal path to reproduce “discrete” 5.1 sound, via a surround sound 7.1 channel speaker topology, from both stereo CD and DVD source material. Tailored specifically to the acoustic properties of the new Lexus IS cabin, the latest Mark Levinson® Surround System is the result of 3 years research and development.

The 300-Watt RMS amplifier covers a frequency range of 20-20 kHz, with less than 0.1% Total harmonic Distortion (THD). It is fully media-compatible with CD, CD-R, DTS 5.1, DVD video, as well as MP3 and WMA music files recorded either on a CD or DVD. Format compatibility includes 2 channel stereo (analogue and PCM), 2 channel Surround Sound, Dolby Digital 5.1, and DTS 5.1 (from DTS 5.1 CD, DVD video and DVD audio discs).

Key to the new Mark Levinson® Surround System are the 14 loudspeakers, each one custom engineered for the particular acoustic characteristics and location within the new Lexus IS cabin. The system comprises for 25 mm tweeters, five 65 mm midrange units, two 100 mm midrange units, two 160 mm woofers and one 200 mm subwoofer.

The sonic benefits of the new, 14 speaker system include lower distortion, higher resolution, natural dynamics through greater sound pressure levels and an extended frequency response for harmonic richness and musicality. Via the system ’s bespoke, 7.1 channel surround sound speaker architecture, separate side and surround channels provide a greater sense of listening envelopment and depth for both front and rear seat passengers.

Installed in conjunction with the Electro Multi Vision’s 7", full colour, LCD centre console display screen, the Mark Levinson® Premium Surround System introduces Lexus IS owners to a complete, discrete 5.1 home theatre entertainment experience optimised for the playback of music, music videos and DVD films within the luxurious environment of the new IS interior.

The new IS is the first model to receive the marque’s next generation Lexus Navigation System. Employing a DVD disc to store map information of the entire Western Europe, the new system’s speed of calculation has increased by an impressive 65%, whilst the graphic draw performance is also three times faster.

Thanks to an increase in system hardware power, the new Electro Multi Vision’s 7", full colour display has now evolved from EGA to VGA (800 x 480 pixels) and replaces the previous system ’s 256 colour range with a remarkable 32,000 colours.

The new system is equipped with 3-language voice activation (English, French and German), and voice guidance is available in 10 languages (Norwegian and Portuguese have been newly added). The system is one of the few on the market to combine the advantages of both touchscreen and voice activation to control several functions of the navigation system, audio, air

conditioning and phone. A Help function has been incorporated, allowing the user to receive further instructions, as well as a route tracing feature and lane guidance in major European cities

(Berlin, Birmingham, Brussels, Cologne, Frankfurt, Glasgow, London, Manchester and Munich). Dynamic Route Guidance is also featured.

A BluetoothTM phone, hands-free system is also integrated into the new Lexus Multimedia and Navigation System. It enables the user to make and receive hands-free mobile phone calls by operating the touch-sensitive LCD screen, through voice command or the steering pad switches. Moreover, the system can store up to 1,000 contact numbers from a mobile phone.

Available for the first time in this segment, the Lexus Parking Assist Monitor features a video camera mounted in the rear number plate surround that projects a full colour rear view of the surroundings onto the centre console display screen. Even greater manoeuvring accuracy is promoted by screengenerated guidelines which indicate the prospective path of the vehicle based on the current steering position, both for serial or parallel parking.

ADDITIONAL LUXURY FEATURES

The full leather, 3-memory, 8-way electrically adjustable front seats fitted as standard to IS Luxury specification models are equipped with lumbar support adjustment, as well as heating and ventilation. In ventilation mode, two fans draw air silently through the perforated seat-back and cushion to improve passenger comfort during long journeys. A 3-memory system for seat, exterior mirrors and steering wheel adjustments further complements these features.

The Luxury grade IS also features an electric rear sunshade which automatically retracts whenever reverse gear is engaged. With a forward gear selected, the shade automatically re-deploys as soon as the vehicle reaches 15 km/h.

In Sport and Luxury grade IS models, both the interior rear-view mirror and door mirrors include an electrochromatic anti-glare system, the door mirrors automatically tilting downwards when reverse gear is engaged to improve kerb visibility when parking.

The Sport and Luxury grade IS range is also fitted with the Lexus Parking Assist Sensors, which combine information from both front and rear mounted sonars to warn of object proximity during low speed and parking manoeuvres. The system indicates the position and proximity of any detected obstacles both on the Multi-Information Display screen and via a firstly intermittent, then continuous, buzzer.

The new Lexus IS optional sunroof features a unique sunroof operating system which combines one-touch full opening and closing with rotary knob control offering 10 intermediate positions.