Producing 345bhp in all forms, the new engine is nearly 100bhp less powerful than the eight-cylinder unit in the old S6 and S7. It counters with significantly more torque, putting out a peak of 516lb ft at 2500rpm.
The electric compressor, also used in the V8 diesel Audi SQ7, is utilised to fill any torque gaps at low revs before the turbo can spool up. Responding in 250 milliseconds, it works up to an engine speed of 1650rpm and spins up to 70,000rpm.
The result is a 0-62mph time of 5.0sec in the S6 saloon, increasing by a tenth of a second in the S6 Avant and S7 Sportback. The top speed is, as usual, limited to 155mph.