Turbocharger - Gasoline: Operation: Compressor

The compressor is connected directly to the turbine by a shaft, therefore, the speed of the turbine wheel will be the same as the compressor wheel. No exhaust gas is actually passed into the compressor. The spinning compressor forces more air into the intake manifold than would normally be drawn in under atmospheric pressure.

With a higher intake manifold pressure and denser charge available, more air/fuel mixture is drawn into the combustion chamber on the piston intake stroke. A denser mixture results in more power output from engine. The faster the compressor spins, more air is compressed into manifold.