Toyota Yaris TS in Depth

Press Release

Dual VVT-i technology

• All-new 1.8-litre Dual VVT-i engine

• Complements existing, innovative engine line-up

• More mid-range torque and power

• Low emissions and fuel consumption

The all-new 1.8-litre Dual VVT-i engine which powers the Yaris TS is designed to offer enjoyable driving performance with low fuel consumption and sophisticated refinement. Its low weight The new engine complements the existing broad choice of powertrains already available through the Yaris model range – each one carefully selected to offer customers a balance of lively power output, low fuel economy and low ownership costs to suit their needs.

Indeed, an important feature of the Yaris engine range is innovation, offering advanced technology from Toyota that enhances the ownership experience. The entry-level 1.0-litre petrol is a threecylinder VVT-i (Variable Valve Timing – intelligent) unit that combines lightweight and compact design yet still delivers 51kW (69 hp DIN) at 6000 rpm.

The 1.3-litre petrol also features VVT-i for increased power and reduced emissions. The 1.4-litre D-4D available in Yaris is part of Toyota’s advanced common-rail diesel engine range which helps drive Toyota’s sales growth in Europe.

This innovation continues with Yaris TS which introduces Dual VVT-i, a significant evolution of the popular and effective VVT-i technology already available across the current range of Toyota petrol engines. By simultaneously varying the timing of both the intake and exhaust valves, the new technology is able to create optimum combustion conditions over a wide range of engine speeds.

The 1.8-litre Dual VVT-i engine develops 98kW (133 hp DIN) at 6,000 rpm and maximum torque of 173 Nm at 4400 rpm. Most significantly, over 90% of the maximum torque output is constantly available from 2000 rpm to 6000 rpm, giving Yaris TS excellent mid-range pulling power and thoroughly enjoyable open road driving performance.

At the same time, Dual VVT-i boosts top-end power so Yaris TS feels lively and exciting with good acceleration. Top speed is 194 km/h and the car will reach 100 km/h from standstill in 9.3 seconds.

Yet this performance is not at the expense of fuel economy. The combined cycle fuel consumption for Yaris TS is at 7.2 litres/100km with a CO2 output of 170 gm/km. The Dual VVT-i system uses hydraulic pressure, controlled by the main engine computer, to independently alter the advanced and retard settings of both the intake and exhaust camshafts.

This is more effective than the current VVT-i system, which works only on the intake timing.

Optimum setting of both camshafts allows the engine to develop increased torque at low and medium engine speeds with increased power output at higher engine speeds. Higher output is also achieved by increased valve lift.

At the same time, the more efficient combustion created by the Dual VVT-i technology offers better fuel economy and lower emissions – giving Yaris TS owners more enjoyable driving pleasure and reduced costs of ownership.

Further contributions to combustion efficiency come from the ‘diagonal squish’ design of the combustion chamber, the long port intake manifold and the long reach spark plugs which contribute to enhanced anti-knock performance.

Light weight, low friction

• Extensive use of Computer Aided Engineering (CAE)

• Reduced frictional losses

• Better engine response

But the new engine is not just about more power and more torque. It is also a very compact and lightweight unit with considerable focus on reduced frictional losses and low levels of noise, vibration and harshness (NVH). These measures contribute to increased driving pleasure, better engine response and better fuel consumption.

The overall size and weight of the aluminium block unit has been reduced by optimising the timing chain layout and changing the oil pump position. The water pump and lubricated oil passage are integrated into the front of the engine.

Extensive use of computer-assisted engineering (CAE) has reduced the weight of the reciprocating parts and increased the rigidity of the engine block structure. Further weight reduction comes from the use of a resin-type intake manifold.

A roller rocker arm system is used to reduce friction between the camshaft and the valve mechanism while oil-pressure activated adjusters mean valve clearance is automatic and maintenance free, further reducing ownership costs.

Low tension piston rings, an offset crankshaft and optimised intake ports all further contribute to excellent low friction and reduced fuel consumption.

Low levels of NVH

• Premium driving pleasure

• Rigid cylinder block and crank case

• Excellent noise suppression

Driving pleasure with Yaris TS is further enhanced by the low noise levels and premium vibration suppression of the 1.8 Dual VVT-i engine. The extensive use of CAE has ensured the rigidity of the cylinder block and aluminium crank case while the three engine mounts are rigid to avoid any uncontrolled movement. In addition, a balanced, forged crankshaft has been used and a highly rigid, steel oil pan is fitted. Noise transmission from the engine is suppressed with the sound-absorbing engine cover.

Slick five-speed gearbox

• Carefully selected gear ratios

• Leather trimmed gear knob

Power from the 1.8-litre Dual VVT-i engine is channelled through a new ‘C56’ five speed manual gearbox which has been specially adopted for the engine. Gear ratios have been carefully selected to maximise the performance characteristics of the engine

with excellent mid-range acceleration.

The tactile pleasure of the new gearbox is emphasised by the chrome-plated shift lever knob which is trimmed in leather. Gear changes are slick and smooth – and the gearshift gate has been designed to promote accurate and rapid changes. Double cone synchromesh is adopted on first gear for slick downshifts and the second gear synchromesh has also been re-engineered. Low viscosity gear oil helps contribute to improved fuel economy.

This combination of slick C56 gearbox, flexible 1.8 Dual VVT-i engine and Yaris TS sports chassis and suspension ensures the car delivers enjoyable driving performance – with refinement – under all driving conditions.