4.0 TDI

Superior

The V8 TDI with a capacity of four liters introduced for the A8 in 2003 was Audi’s largest diesel at that time, and the most powerful of its kind on the market. Its common-rail fuel injection system had been further developed and now featured seven-hole nozzles and a higher injection pressure. Key figures were a power output of 202 kW (275 hp) and a peak torque of 650 Nm (479.42 lb-ft). With cylinder centers spaced at 90 millimeters (3.54 in) and timing chains at the back of the engine, the 4.0 TDI introduced two design features that were to appear again on the future generation of Audi V-engines that began to appear a year later.