There are more ways to turn an air pump than using a belt drive system. A turbocharger uses a turbine mounted in the exhaust system to spin a small centrifugal compressor. The extra restriction in the exhaust may rob the engine of a few horsepower, but it is considerably less than the power needed to drive a supercharger from the crankshaft.

Selecting the right turbocharger is not only a question of engine size, but a question of when you want the boost to kick in and how much boost you wish to run. A small turbocharger can spool up quickly to deliver boost at 2,000 RPM or less, but a larger turbo will be able to feed the engine more boost at high RPM for more peak power. Larger amounts of boost will not only require a larger turbo, ...

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