First and foremost, its features a revolutionary electric powered compressor (EPC) that forces air through mechanical turbochargers when the engine is in the lower reaches of the rev range, purportedly doing away with traditional turbo lag by reducing the spool - up time. (motoring.com.au)
But this Audi developed engine, which has already been released in the SQ7, is supposed to use a triple charged forced induction system, with a 48v electric powered compressor generating this massive torque at 1000rpm. (autocar.co.uk)
The new 4.0 litre V8 TDI gets twin turbos plus a new electric powered compressor (EPC) which works with the turbos to add boost at low revs. (carsuk.net)