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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
Posts: 3,899
Something aint right for it to work for awhile, then quit working. Apparently you do have the boost line connected to the corrrect bango (the one on the side, vs. the top one that just goes to atmosphere).

Upon inspection, your diaphram doesn't have a small tear does it? The only other thing might be a worn valve guide which could let the boosted air escape instead of pressurizing the diaphram and opening the valve as it should.

When you bench test, you'll most likely hear some air escaping through the guide. SOME air is probably normal, a lot of air is not. Also, you will probably need more than .8 bar (12 psi) of air pressure to open the valve on the bench. That's normal since there is no exhaust pressure present. It's been my experience that around 16-17psi is needed when bench testing, depending on age/condition of the WG.

You could leave the WG in the car and with the engine running, simply add a known amount of pressure via the hose connected to it and listen for the WG to open.
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 01-29-2012, 06:04 AM
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