Engine Performance: System: Turbocharger: Description

The turbocharging system is mounted on the top rear of 3.8L engine and on left side of 1.8L engine. It includes a turbine assembly, center house rotating assembly (CHRA), compressor assembly, plenum chamber, wastegate, and throttle body. Turbine is spun by exhaust gas and causes compressor to draw air.

Both engines use a port fuel injection system for fuel delivery. The throttle valve, located inside throttle body, determines amount of air delivered to engine.

Maximum manifold pressure (boost) is controlled by an exhaust by-pass valve called a wastegate. The wastegate senses pressure differences through a diaphragm type actuator, to determine how much exhaust should be routed to turbine. Any excess exhaust gas is by-passed into exhaust system.

On 3.8L engines two types of turbochargers are used. One for "E" models and one for "G" models. Both are similar in design and operation. The only distinction between the two will be in the Removal & Installation procedure. All testing, inspection and repair procedures are the same for both units.