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mark houghton mark houghton is offline
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Join Date: Jul 2008
Location: Central Washington State
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Originally Posted by RarlyL8 View Post
The valve can become covered with coke and not seat properly and the spring will fatigue with age. So yes the wastegate can become less crisp in response or accurate with age. Complete failures can occur in cars that sit for extended time as oxidation forms and hoses become brittle.
Add to that valve guide wear and too much boost air bypassing via a bad guide, and you'll have a sluggish WG. Or coke buildup in the guide itself, causing the valve to hang-up and not fully seat. As Brian mentioned, I suppose that the spring can eventually loose it's "spring" due to constant heat affecting the spring temper over time.
These WG's are pretty bullet proof, but they do eventually start to show symptoms in high mileage cars. Fortunately there are great aftermarket solutions.
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 01-29-2010, 08:12 AM
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