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copbait73 copbait73 is offline
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Join Date: Nov 2003
Location: Chesterfield IN
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The wastegate is a turbine flow control device. Itís impact on backpressure is secondary but exhaust backpressure continues to increase after it opens. The wastegate valve is like any other valve and it responds favorably when the pressure differential across it is increased, so reducing its dump path pressure has positive effects. Unless the wastegate (and feed) is too small it will hold the intake at a set point.

The peak compressor efficiency between modern compressors and others is only 5% and this is not significant. The flow range is significant. The factory KKK match at 6000RPM is in the low 60% range. Add another 500RPM and its mid 50%. Use a modern Garrett or KKK modified with a large compressor wheel and you are back into mid 70% efficiency at high RPM. This is significant.

Improved compressor efficiency reduces turbine backpressure as less power is needed of the turbine to produce a fixed intake manifold boost pressure.
Old 01-04-2010, 03:03 PM
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