Turbo Pressure Control

Turbo Pressure Control

The turbo pressure in the intake manifold depends mainly on engine speed and load. At higher loads, however, turbo pressure is restricted by the waste-gate.

The wastegate is a flap valve which closes or opens the bypass channel at the side of the turbine. The flap valve is actuated by a rod from a diaphragm unit mounted on the compressor housing. The diaphragm is controlled by compressor pressure and a spring in the diaphragm unit closes the flap.

At low or normal loads, the wastegate is closed. When the load increases and turbo pressure approaches the highest permitted level, the force of the spring is overcome and the valve opens the bypass channel, thus reducing the pressure.

The pressure is controlled continuously by means of a solenoid valve connected by hoses to the turbocharger and the diaphragm unit.