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| | TurbochargerA supercharger powered by an exhaust-driven turbine. Turbochargers always use centrifugal-flow compressors, which operate efficiently at the high rotational speeds produced by the exhaust turbine. Boost PressureThe increase above atmospheric pressure produced inside the intake manifold by a forced-induction system such as a turbocharger or supercharger. Boost is commonly measured in psi. Turbo LagWithin a turbocharger's operating range, lag is the delay between the instant a car's accelerator is depressed and the time the turbocharged engine develops a large fraction of the power available at that point in the engine's power curve. Waste GateA valve used to limit the boost developed in a turbocharger. A waste gate operates by allowing some of the engine's exhaust flow to bypass the turbocharger's turbine section under certain conditions.
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