The new 4.0-l V8 TFSI engines from Audi - the logical combination of efficiency and performance

摘要

The 4.0-l V8 TFSI engines from Audi are a new development that introduces the downsizing strategy to the high-performance market segment. They are twin-turbo engines that develop up to 382 kW (520 bhp). Thanks to forced aspiration, the V8 TFSI develops a supreme flow of power, with up to 650 Nm of torque available at engine speeds between 1700 and 5500 rpm. The cylinder head concept with the intake system on the outside and the exhaust system on the inside is designed to keep the gas flow paths short, with minimal flow losses. The engine, with its two twin-scroll turbochargers, has a highly spontaneous throttle response. As a highlight on these engines, the 'cylinder on demand' system, based on the Audi valvelift system (AVS) is employed. In addition, friction losses have been significantly reduced by various measures, and innovative thermal management (ITM) adopted. The new V8 TFSI will initially be available in the Audi S6, S7 and S8 models. Both the Audi S6 and the Audi S8 from the previous model generation were powered by a 5.2-l V10 FSI engine. The change to the new 4.0-l V8 TFSI has cut CO_2 emissions by as much as 25% despite much improved performance figures.