BMW 7 Series Redesign In Depth

 BMW 7 Series Redesign In Depth
BMW 7 Series 2005

Eeady for the second half of its model cycle

Press Release

BMW 750i/Li and 740i/Li: Even more power on the same fuel consumption as before

Fundamentally updated and modified key engines in the BMW 7 Series.
Following BMW’s innovative straight-six petrol and diesel engines which made their debut last year, BMW is now focusing on its V8 power units as the new highlight in the Company’s engine initiative. Accounting for almost 65 per cent of all BMW 7 Series delivered to customers, these key engines in the 7 Series have been fundamentally updated, offering significantly more power and thrust through their increase in size to 4.0 and, respectively, 4.8 litres. Fuel consumption nevertheless remains unchanged, the large V8 now also complying with the strict ULEV II US emission standard.

Unique smoothness and the perfect balance of sound make the BMW 7 Series with its new eight-cylinder power units an absolutely superior luxury saloon. At the same time the 750i/Li and the 740i/Li stand out as very sporting and dynamic cars boasting fast-revving and efficient power units responding spontaneously to the gas pedal.

In their overall combination of power and performance, fuel efficiency, responsiveness, and motoring refinement, the new BMW 7 Series with their eight-cylinder petrol engines rank right at the top of their respective segments.

The new BMW 750i/Li with its 4.8-litre eight-cylinder

 

Significant improvement of all dynamic driving data.

The larger of BMW’s two V8 power units featured in the new 750i/Li displaces 4,799 cc and develops maximum output of 270 kW/367 hp at 6,300 rpm. Given this kind of power, the dynamic 750i accelerates to 100 km/h in 5.9 seconds (750Li: 6.0 seconds). Maximum torque is a substantial 490 Nm/361 lb-ft at 3,400 rpm, and it almost goes without saying that the car complies with the EU 4 emission standard.

Versus the former 4.4-litre power unit, engine output is up by 10 per cent (previously 245 kW/333 hp) and torque by 9 per cent (previously 450 Nm/332lb-ft). Acceleration from 0–100 km/h is 6 per cent faster than before (previously 6.3 sec). Despite the larger size of the engine, a lot more power and torque, and even more dynamic acceleration, fuel consumption remains unchanged in the EU cycle at 11.4 ltr/100 km (24.8 mpg Imp) and the new 750i/Li have been upgraded in their fulfilment of US emission standards, with an improvement from LEV to ULEV II.

Best-in-class up to 5.0 litres.

Offering truly outstanding power and performance, the 750i/Li featuring BMW VALVETRONIC and double-VANOS play a leading role in the segment of luxury saloons with engines between 4.0 and 5.0 litres capacity. Maximum output of 270 kW/367 hp is an outstanding figure in this segment reflected by appropriate acceleration both from a standstill and at speed.

The most impressive point, however, is the overall package offered by the 750i/Li, making it quite unique in the market: The BMW 750i/Li ensures exceptional engine response and rapid reaction in all driving situations, offering ample power and performance reserves whenever and wherever required. Again reflecting that typical BMW style, the eight-cylinder revs up quickly and smoothly like a turbine, giving both the driver and the passengers an extremely sporting and dynamic driving experience based on supreme agility and nimble handling.

At the same time the BMW 750i/Li offers sheer supremacy in all situations: Through its running smoothness, high torque at low engine speeds and the optimum combination of comfort and sportiness borne out in particular by the aluminium chassis and suspension of the BMW 7 Series, the 750i/Li is the leading luxury saloon in the five-litre class. It stands out both as a sporting four-door and as an elegant saloon full of presence in meeting the highest demands in terms of comfort and design. Just how popular the 750i/Li is among customers in meeting their demands is proved by the fact that more than 50 per cent of all BMW 7 Series ordered by customers so far feature the large V8 power unit.

Efficient Dynamics: Power up by 29 per cent, fuel consumption down by 9 per cent in just four years.

A comparison with the former eight-cylinder in the BMW 740i sold successfully in the market until 2001 clearly underlines the progress made within the 7 Series’ engine compartment: Within just four years, engine output has increased by almost 29 per cent from 210 kW/286 PS, torque is up by more than 11 per cent, and fuel consumption as well as emissions are down by 9 per cent.

 

The new BMW 740i/Li with its 4.0-litre eight-cylinder

 

Making a dynamic and efficient entry into BMW’s upper-class V8 segment.

Displacing exactly 4,000 cc, the smaller of BMW’s two new V8 power units is exactly in line with the new 740i/Li model designation. Maximum output is 225 kW/306 hp at 6,300 rpm, peak torque is 390 Nm/287 lb-ft at 3,500 rpm. The new 740i accelerates to 100 km/h in 6.8 seconds (740Li: 6.9 seconds) and consumes 11.2 litres/100 km in the EU cycle (25.2 mpg Imp), certainly a moderate figure for a V8 saloon with this kind of power and performance. And it almost goes without saying that the 740i/Li comply in full with the EU 4 emission standard.

A convincing boost in power.

The increase and performance on the 740i/Li is also impressive, particularly considering that this improvement comes almost “for free�, that is with virtually no increase in fuel consumption (up by only 0.9 per cent): Compared with the power unit featured so far in the 735i, engine output of the new 740i/Li is up by 13 per cent (previously 200 kW/272 hp), with an increase in torque by 8 per cent (previously 360 Nm/265 lb-ft). Acceleration from 0–100 km/h, in turn, is 9 per cent faster than before (previously 7.5 seconds).

Leading the way in power, performance, dynamics, and efficiency.

Offering a virtually perfect balance of power, performance, elasticity, refinement, dynamics, and fuel economy, the new BMW 740i/Li comes right at the top in its class. Reflecting the concept of Efficient dynamics, all relevant parameters have been jointly improved to the benefit of a higher level of all-round performance for the customer.

In its class, the 740i/Li is unparalleled in terms of both responsiveness and superior torque. This is mainly attributable to the interaction of VALVETRONIC and double-VANOS, a combination of high-tech features exclusive to BMW. As a result, the smaller of the two V8 petrol engines in the 7 Series offers supreme cruising qualities and the muscular sound of eight cylinders, that is features the customer would otherwise only expect from cars with an even larger and more powerful engine. At the same time the 740i/Li leaves behind the competition through its immediate response to the gas pedal and a standard of nimble handling which gives new meaning to BMW’s concept of driver orientation: Also in the guise of the 740i/Li, the BMW 7 Series is a supreme luxury saloon consistently designed and built to give the driver an active motoring experience of the highest calibre.

Power and fuel consumption successfully separated.

Until the year 2001 (in the former model), BMW’s smaller V8 petrol engine developed maximum output of 175 kW/238 hp and peak torque of 345 Nm/254 lb-ft on average fuel consumption of 12.1 ltr/100 km. Since then engine output has been increased by 29, torque by 13 per cent, while at the same time fuel consumption is down 7.4 per cent to 11.2 litres/100 km or 25.2 mpg Imp.

Technical highlights of BMW’s V8 petrol engines

 

VALVETRONIC and double-VANOS making these engines the most progressive in their class. With fuel consumption and emissions reduced by up to 10 per cent.

One of the most outstanding technical features of BMW’s petrol engines – and at the same time a feature coming as standard! – is throttle-free load management by way of BMW’s VALVETRONIC fully variable valve drive. With this technology engine output is no longer controlled by the throttle butterfly, but rather by the valve opening period. The main advantage for the customer is a significant decrease in fuel consumption and emissions, VALVETRONIC reducing fuel consumption by up to 10 per cent above all under part load, that is under the driving conditions experienced most frequently.

Exceptional responsiveness.

BMWs featuring VALVETRONIC power units such as the 750i/Li and the 740i/Li respond perfectly to the gas pedal, in many respects outperforming even the high-performance power units with individual throttle butterflies commonly used in motorsport and acknowledged for their fast reaction. VALVETRONIC transmits the driver’s commands from the gas pedal to the engine by wire, implementing the driver’s instructions directly in the combustion chamber by increasing valve lift. Hence, the period elapsing between the driver’s commands and the actual generation of power is extremely short indeed, VALVETRONIC offering the driver truly outstanding engine response in every situation.

A leading technology suited for all markets.

A point particularly important to a global player such as BMW is to have a technology suitable for reducing fuel consumption which is fully independent of specific conditions and requirements in each market, such as the availability (or non-availability) of low-sulphur fuel. And precisely this is what VALVETRONIC – a leading technology absolutely exclusive to BMW – has to offer. As a result, the BMW 7 Series consistently and successfully meets the wishes and needs of BMW customers in virtually all global markets, offering all customers the same supreme standard of high technology.

Double-VANOS: Fully variable timing on all 32 valves. Precise gas cycle, more power and torque.

Complementing the valve opening periods controlled and masterminded by VALVETRONIC, double-VANOS controls the individual intake and outlet phases with maximum precision and fully variable flexibility. The driver benefits from double-VANOS in terms of much “beefier� torque at low engine speeds and extra power at high speeds.

 

Source: Text & photos courtesy BMW AG

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