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Old 01-03-2004, 12:25 AM   #11
Scooby Specialist
Member#: 524
Join Date: Nov 1999
Location: WA
04 STi


Actualy A wastegate doesn't NEED to flow enough exaust to control boost, it only needs to be able to control the pressure drop ACROSS the turbine. So the stock wastegate setup in a VF39 works great because while it doesn't flow worth a damn, its great and murdering the flow out of the turbine with the stock downpipe in place. In fact I bet if you could measure the flow through the wastegate for both the stock downpipe and a aftermarket bellmouth, you would find that the flow goes up alot with the aftermarket setup... yet can't control the boost as well thanks to the flow not being able to affect the flow out of the turbine anywhere near as well as with the stock downpipe
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