Description And Operation

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In previous turbocharged engines with lower specific power, the cylinder exhaust collected in a single volume exhaust manifold which is in turn connected to the turbine entrance. This is defined as "supercharging at constant pressure". These exhaust gases entering at the same volume expand slightly, reducing the typical pressure pulses, allowing the turbine to operate more efficiently but at the expense of pure performance.

When the cylinder exhaust is sent directly to the turbine, supercharging is defined as the "pressure pulse" type. With this direct connection, the pressure pulses make the turbine operate at high efficiency but, at the same time, with higher turbine impeller reactivity. Pressure pulse supercharging is typical in racing cars where pure performance is the most important consideration.

The exhaust collector is part of the turbine housing. With this design, the turbocharger has a direct connection between the cylinder's exhaust and the turbine impeller.

The exhaust gas bypass waste gate valve is electrically actuated. The turbocharger is manufactured by Honeywell.

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At the front of the turbocharger, there are ports for connecting the coolant inlet and coolant outlet of the low temperature cooling system.

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Oil from the engine lubrication system enters the turbocharger at the top.

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Oil returns to the engine lubrication system from the bottom of the turbocharger.

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The turbocharger actuator that moves the bypass waste gate valve is equipped with an electric motor and a position sensor. When the engine is off, the Powertrain Control Module (PCM) places the waste gate valve in the open position. When the engine is started, the PCM closes the waste gate valve.