Manifold and Turbocharger Section

The manifold incorporates the turbocharger turbine bypass control actuator which is connected by a rod to the pressure actuator which is mounted on the turbocharger. The turbocharger turbine is also located within the manifold fabrication. The turbocharger housing is attached to the manifold with a two piece clamp which is secured with a bolt and nut.

Rest Of World (ROW) Market Vehicles fitted with a Turbine Bypass Control Solenoid 

Rest Of World (ROW) market vehicles are fitted with a pressure operated turbine bypass control actuator which is normally closed. This system uses a turbine bypass control solenoid which opens the turbine bypass control shut-off valve.

The turbine bypass control solenoid is energized by a Pulse Width Modulation (PWM) signal from the Powertrain Control Module (PCM).

Pressure pipes are connected to the inlet air side of the turbocharger housing and are connected to the turbine bypass control solenoid which is located on the turbocharger housing.

The turbine bypass control actuator will start to open at about 0.35 bar (5.07 lbf/in² ) and will be fully open at about 0.55 bar (8.00 lbf/in² ).

On a quick throttle closing, the compressor can be running at high speed with no air flow, which is an unstable operating condition. This creates a sound, or surge, which is quite noticeable in the vehicle. To counteract this, the turbocharger is fitted with a vacuum actuated recirculation valve. The valve is connected via a tube to the intake manifold. The valve addresses the sound by responding to intake manifold vacuum (created when the throttle is closed). The vacuum activates the valve in the turbocharger which opens up a channel from the compressor outlet back to the compressor inlet. This recirculation of compressor air minimizes the unstable surge condition and the related noise.

North American Specification (NAS) Market Vehicles fitted with a Turbocharger Vacuum Solenoid 

North American Specification (NAS) market vehicles are fitted with a vacuum operated turbine bypass control actuator which is normally open. This system uses a turbocharger vacuum solenoid to close the turbine bypass control shut-off valve.

The turbocharger vacuum solenoid is energized by a Pulse Width Modulation (PWM) signal from the Powertrain Control Module (PCM).

Vacuum pipes are connected to the turbocharger vacuum reservoir which is located on top of the intake manifold and the turbocharger vacuum solenoid which is located on the right side of engine.

The turbine bypass control actuator will start to close at about 0.35 bar (5.07 lbf/in² ) and will be fully closed at about 0.55 bar (8.00 lbf/in² ).