► Audi V6 TDI Biturbo 320 HP engine

New 3.0 TDI with biturbo technology and 235 kW (320 hp). It accelerates the five-door coupe from zero to 100 km/h (62.1 mph) in 5.2 seconds on the way to an electronically governed top speed of 250 km/h (155.3 mph). Average fuel consumption is just 6.1 liters per 100 km (38.6 US mpg), which equates to 162 g CO2 per km (260.7 g/mi). The biturbo TDI is always paired with quattro permanent all-wheel drive.

A sound actuator in the exhaust system gives this diesel engine a rich, resonant sound reminiscent of an eight-cylinder unit. A valve connects the two in-series turbochargers. At low revs it is closed. The small charger with its variable turbine geometry does most of the work, and the large charger is responsible for the pre-compression. From about 2,500 rpm, the valve starts to open and the small charger increasingly transfers the major share of work to its counterpart. Between 3,500 and 4,000 rpm, the valve opens completely, and only the large charger still operates.

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