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Turbochargers and superchargers are devices that are used to compress the fuel-air mixture drawn into the cylinder of an internal combustion engine. This increases the amount of combustible fuel in the cylinder, thus producing more power. A turbocharger is driven by the engine's exhaust gases, while a supercharger is driven mechanically by the engine crankshaft. This is the reason why a turbocharger has some lag between the time that the accelerator pedal is pressed and the boost pressure increases: it takes some time for the exhaust gases to spin up the compressor rotor inside the turbocharger.
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