The engine in the R8 TDI Le Mans study is closely related to the diesel race engine technically speaking - the high-performance sports car is equipped with a six-liter V12 power unit whose output of 368 kW (500 hp) and torque of 1,000 Nm (737.56 lb-ft) are good for a top speed comfortably in excess of 300 km/h (186.41 mph). The R8 TDI can also be seen at the Lake Wörther Tour, as the major annual gathering of horsepower-happy Audi and VW enthusiasts is known. Audi has already transferred the superior power of the TDI engines into its road-going cars: the TT and TT Roadster both feature a mighty two-liter unit generating 125 kW (170 hp) and 350 Nm (258.15 lb-ft) of peak torque, coupled to the quattro all-wheel-drive system. As is plain to see, Audi continues to build on its lead in the technology stakes.

The high-performance TDI under the bonnet of the Audi A3 TDI clubsport quattro is like nothing that has gone before it. From its displacement of just 1,968 cc, it summons up an output of 165 kW (224 hp). Torque - the true measure of effortless motoring ability - peaks at an exhilarating 450 Nm (331.90 lb-ft), which is on tap from just 1,750 rpm; in other words, the very bottom of the rev range. As for in-gear flexibility, the diesel model leaves its gasoline-powered rivals standing.

The mighty TDI bestows the Audi A3 TDI clubsport quattro - which tips the scales at just 1,475 kilograms (3251.82 lb) - with pulling power befitting of a sports car. The sprint from 0 to 100 km/h (62.14 mph) is over in a fleeting 6.6 seconds and the speedometer needle keeps rising all the way to 240 km/h (149.13 mph).

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