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Date: Tue, 14 Dec 2004 09:54:32 +0100
From: Frode <>
Subject: Re: 99 Turbo update - vroom vroom

Dave Hinz wrote: > Ah. I have no exhaust system on the car right now aside from the > header, and that has leaks. Must sound interresting, Should give you more high-end boost than most 99's, but I don't think that is the source of your problem. > How do I check the wastegate with a bicycle pump, please? Locate the tube going from the exhaust manifold near where the tranny dipstick is located to the aluminium top cover of the regulator housing. Disconnect it at the top cover, careful with the threads at the manifold side, they are likely to be rusted and brittle. Now you can verify that the diaphragm is intact by gently applying compressed air onto the housing. There should not be significant leaks, as that would flood the regulator with hot exhaust all the time, no doubt with harmful results, I am not sure how much pressure is needed to crack open the valve, especially not one that has been sitting for a decade, so if say a moderate 10-15 psi is insufficient I would rather remove the four 4mm (5mm? (no 4!)) nuts and the lid, thus gaining mechanical access to the end of the valve shaft. Don't rotate it as that would destroy the expensive rubber-diaphragm instantly! Check that it can be pushed in and that it comes out again by itself. BTW, the big, locked nut at the end of the shaft is of course the place to adjust the boost. Increased spring pretension results in more boost. You may want to go the other way at first. That will exersize the wastegate system a bit extra too. -- Frode

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