Quote:
Originally Posted by Dan Stokes
I'd take a good look at the wastegate. If it isn't operating smoothly it may be bypassing exhaust gas when you need it to "feed" the turbo. This is an over-simplified explanation but a definite maybe. Perhaps when you have it at partial boost the waste gate finally opens to the turbo and the turbo can then get busy like it should. Worth checking.
Dan
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The wastegate should be CLOSED until the actuation pressure is reached at which point it opens, bypassing exhaust gas around the turbine.
The valve could be stuck from carbon and held slightly open, which would require a much higher flow of exhaust gas for a given compressor pressure.