Turbocharger (TC)
Only applies to turbocharged engines.
The exhaust gases enter via the manifold (1) down to the turbine housing (8) and out to the exhaust system via a downpipe and catalytic converter.
The turbine expels the exhaust gases and rotates the compressor wheel (3). The compressor wheel creates a certain amount of suction using the intake air. This intake air enters the compressor via the air filter and uses a rotational movement to speed up the air, creating the boost pressure. The air then continues into the intake system via the charge air pipe and charge air cooler.
The electronically controlled By-pass valve (4) then controls the boost pressure in the turbocharger by determining the amount of exhaust gases which must pass the turbine. The turbine transfers drive to the compressor. The wastegate valve (2) is a membrane which equalizes the pressure of the intake and exhaust air to eliminate noise.
The turbocharger is lubricated by the engine's oil system (7). The oil system also acts as a supplement to the coolant system (5 and 6).