Secondary Turbocharger (If Equipped)

The secondary turbocharger is attached to the right exhaust manifold and is secured to 3 studs on a flange on the manifold with nuts. On production, no gasket is used to seal the joint surface between the turbocharger and the manifold. In-service vehicles will require a service gasket to be fitted if the joint surface is disturbed.

A second flange on the turbocharger provides for the attachment of the right down pipe of the exhaust system. Two screws secure the down pipe to the flange and a gasket seals the joint.

The compressor end of the turbocharger has two hose connections. The central connection provides a clean air supply from the air cleaner to the compressor. The second connection on the outside of the housing provides for the attachment of the charge air ducts.

A pipe on the center housing of the turbocharger provides for the connection of a bleed air pipe from the charge air duct connection with the electric throttle. The bleed air is used to pressurize the seals of the compressor stage to prevent oil leaking into the compressor housing when the turbocharger is not running.

Attached to the rear of the turbocharger is a turbine intake shut-off valve operated by a vacuum actuator. The ECM operates the turbine intake shut-off valve solenoid to apply and release the vacuum in the actuator, which opens the turbine intake shut-off valve when a vacuum is present. The turbine intake shut-off valve is closed when the system is operating in mono-turbocharger mode, diverting exhaust gases from the right exhaust manifold, via the exhaust cross-over duct to the left exhaust manifold. A position sensor in the turbine intake shut-off valve allows the ECM to monitor the shutoff valve for correct operation.