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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,682
Most of the time, it's enough to just supply compressed air (or just blow trough it) trough vent hole (on the top of wastegate bell) and see if it vents further down.

If it does, diaphragm is ruptured.

That being said, a faulty/stuck BOV will give you boost peaks on overrun despite having fully functional wastegate. If your boost-sensing line (going to boos gauge) is connected before throttle, a stuck BOV would let turbo build pressure way over what wastegate would allow. It will do that due to impeller inertia. Reason that BOV exists is to recirculate air on shifts so this doesn't occur.

You can also test WG by just hitting third gear and watching the boost gauge. If it hovers around 0.7 bar (for stock spring), it's OK.
Thank you for your time,
Old 04-09-2008, 06:26 AM
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