The Audi SQ7 is powered by a 4.0L sequential turbo diesel V8. It’s good for about 435 horsepower and 660 lb-ft of torque, which is great, but the fun doesn’t stop there.In order to eliminate unresponsive nature of turbocharged engines.
source/image: Engineering Explained
Audi has fitted the car with an electric supercharger, the first in a production vehicle. This means adding an onboard 48V system that can handle the additional power requirements of the electric powered compressor (EPC).
Which at full throttle can produce 7 kW of power, enough to spin the compressor wheel up to 70,000 RPM in just a quarter of a second. Full details of how this system works in the video, as well as animations.
Audi’s set up gets even more clever than that. At low RPMs, the supercharge does all the forced induction, while at mid-level RPMs only one turbocharger kicks in. At high RPMs, when there’s enough exhaust to power them, both turbochargers engage for maximum power.