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Date: 14 Dec 2004 20:29:04 GMT
From: Dave Hinz <>
Subject: Re: 99 Turbo update - vroom vroom

On Tue, 14 Dec 2004 21:14:44 +0100, Frode <> wrote: > >> Ah, so this is how it measures the boost pressure, through that line. >> Pushes down on the diaphragm to open the bypass valve, yes? An elegant >> solution. > Not very precise, but less prone to oscillations. I'm sure the fact that the > valve opens in the upstream direction most likely contribute to the > 99-engine's reputation for "ketchup-effect". Um. OK, I'll bite. Huh? >> So if I turn down the boost until I get a feel for everything, that'll >> make >> it travel more and un-sticky itself, in thory at least. Sounds >> reasonable. > > Some info from Heynes no. 247, p 246 > ------------------------------------------------- > PSI Bar Turns in/out to obtain correct Excellent! > Another thing just came to my mind: > Back in the days when this was my only car, I reduced the pressure to .5 bar > or so, since I ran out of spare heads. This resulted in an annoying noise > that I chased for a year before I realized it was the wastegate valve > hammering the seat almost from idle. Had a minor crack in the exhaust > manifold removed and welded without any effect amongst other things! I'll probably set the base boost (wups, boost I mean) to normal spec and leave it there. It should be zippy enough as it, I should think. What is the output of this engine, 160 Horsepower or so, right? Dave

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