HOW A TURBOCHARGER WORKS
The exhaust valve opens and the remaining combustion energy (heat and pressure) is released down the exhaust ports. The expelled exhaust gas is forced through the turbine side of the turbocharger harnessing some of the energy by spinning the turbo shaft connected to the compressor side. The compressor receives fresh atmospheric air from the air-intake system and raises the pressure to above atmospheric in the intake manifold. The intercooler stage increases the efficiency by cooling the fresh-air charge after the compressor stage (resulting in denser air) before it reaches the intake manifold. The engine breathes air at the intake valve at a higher pressure than atmospheric, which results in more oxygen filling the combustion chambers than in a naturally aspirated engine of similar capacity.