R8 TDI concept
The V12 TDI engine is built at the Györ plant, in Hungary. The Audi R8 TDI Le Mans still produces a massive 500PS and the 83.0 mm bore and 91.4 mm stroke produce a total displacement of 5,934 cc. At only 684 mm long, the large diesel engine is very compact and just 166 mm longer than the V8 TDI. This is key to accommodating the V12 in the mid-engined Audi R8.
The two new dual-piston high-pressure pumps build up to a pressure of 2,000 bar in the rails. The high pressure distributes the mixture optimally throughout the combustion chamber. The result is that the ignition process is faster, more homogeneous and more acoustically refined. The more efficient combustion process also increases power output, cuts consumption and reduces pollutant emissions.
The two turbochargers are located on the outside of the engine's 'V' and generate up to 2.6 bar of boost pressure. They play a crucial role in producing the huge torque of 1,000 Nm that the V12 TDI maintains from 1,750 rpm to 3,000 rpm. In developing 368 kW (500 hp), the diesel achieves a specific output of 62 kW (84.3PS) per litre displacement.
The Audi R8 TDI Le Mans already fulfills the Euro 6 emissions standard. The heart of the system is a special catalytic converter downstream of the oxidising catalyst and particulate filter. The second component in the system is an additional tank containing an aqueous urea solution. Small quantities of the solution, known as 'AdBlue', are injected into the exhaust system. The hot exhaust gases break the solution down to form ammonia that splits the nitric oxides into nitrogen and water.