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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Thinking out loud.

Pressure in the heat exchangers is around 25-30 lbs on boost. Even with a muffler on the WG the WG will open as much as it can or has to, to maintain the desired boost pressure up to the point where the WG becomes a restriction. If that happens the motor will probably then experience boost crepe and raise boost above goal.

Not totally sure if this is the case.

Reducing back-pressure after the turbo is a different story as it allows gasses to pass through the turbine wheel faster and easyer to the lower pressure area created if there is no or less muffler (back pressure).

With less turbo back pressure more energy can be transferred to the turbine because of the greater differential pressures. Thus more energy can be compressor wheel and maintain boost longer. It also lowers pressure in the heat exchanger and more exhaust can exit the cylinders.

Thus more power at the same boost due to an increased in VE and more power as the turbo can maintain boost further up the rpm range.
Old 01-05-2010, 02:22 PM
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