TURBOCHARGER The turbocharger forces additional air into combustion chambers so that engine can burn more fuel and develop more horsepower than if it were naturally aspirated. In some cases the turbocharger is used for the engine to retain efficiency (balanced fuel to air ratio) at altitudes above sea level. The turbocharger consists of a turbine wheel and a centrifugal blower, or compressor wheel separately encased but mounted on and rotating with a common shaft. The power to drive the turbine wheel-which in turn drives the compressor is obtained from energy of engine exhaust gases. The rotating speed of the turbine changes as the energy level of gas changes; the engine is supplied with enough air to burn fuel for its load requirements. The turbocharger is lubricated and cooled by engine lubricating oil.