The 4.0 TFSI in the new Audi S8 plus represents the top version stage of the V8 biturbo engine. Its high-tech character is manifested in numerous details, such as the twin-scroll turbo chargers that provide for the early and rapid development of torque, in the innovative thermal management and in the layout of the cylinder heads. Their intake side is on the outside and the exhaust side on the inside. The turbos and their intercooler are located in the inner V. This layout results in short gas flow paths with minimal flow losses and spontaneous response.
The sonorous engine displaces 3,993 cc, producing 445 kW (605 hp) and delivering peak torque of 700 Nm (516.3 lb-ft). With overboost, this temporarily increases this as much as 750 Nm (553.2 lb‑ft). The large sports sedan accelerates from 0 to 100 km/h (62.1 mph) in 3.8 seconds. The electronically governed top speed of 250 km/h (155.3 mph) can be optionally increased to 305 km/h (189.5 mph). Output has been increased 63 kW (85 hp) compared with the S8* and fuel consumption is 10.0 liters per 100 kilometers (231 grams CO2 per kilometer) [23.5 US mpg/371.8 grams CO2 per mile].
The Audi S8 plus achieves these values thanks to the technological expertise of Audi and quattro GmbH. Their many years of experience with high-performance models has flowed into the further development of the 4.0 TFSI. Measures range from the specific engine management with increases to both engine speed and boost pressure to modified exhaust valves to the internal geometry of the turbochargers, which has been optimized for efficiency. The cylinder on demand (COD) system activates just four of the eight cylinders when operating at part load. Active Noise Cancellation (ANC) transmits precise antiphase sound to the cabin via the loudspeakers of the sound system to compensate for any intrusive noise while the engine is operating on four cylinders.
The equipment, data and prices specified in this document refer to the model range offered in Germany. Subject to change without notice; errors and omissions excepted.