How Audi Is Eliminating Turbo Lag – Electric Superchargers

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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.

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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.

VIAEngineering Explained
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