Audi TT 2.0 TDI quattro

Audi has released a turbodiesel version of the Audi TT, powered by a 2.0 litre TDI turbodiesel putting out 170 horsepower at 4,200rpm and 350Nm of torque between 1,750rpm and 2,500rpm, taking the Audi TT Coupe up to 100 km/h in 7.5 seconds, and up to a top speed of 226 km/h, while consuming an average of 5.3 litres per 100 km for the Coupe model, and 5.5 litres for the Roadster model.

The turbodiesel features common rail direct injection with eight-hole nozzle piezo injectors which can inject up to 5 distinct injection sequences per cycle at a 1,800 bar pressure. The turbocharger has Variable Turbine Geometry to reduce turbo lag.

In this particular installation, the piston geometry has been modified and the acoustics of the camshaft drive belt has been overhauled. Two balance shafts reduce crank vibrations. These are all measures to raise the maximum engine speed of the turbodiesel to 5,000rpm, relatively high for an oil burner. This engine is mated to a 6-speed short throw manual with long final drives to suit the diesel torque curve.

Of course being a performance Audi, it is equipped with quattro all-wheel drive, which can divert 100% of power to either the front or rear axle, but runs most of the time in a front axle-biased 85:15 ratio.