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Correction... Posted by Larry West [Email] ![]() ![]() ![]() In Reply to: Re: It's boost, Jim, but not as we know it >, Larry West ![]() ![]() |
1 bar of "boost" means an absolute manifold pressure of TWO bar (one bar atmospheric at sea level, plus one bar of boost = 2 bar).
That line between the white and yellow, where the boost needle sits when the car is off is representative of ambient atmospheric pressure, or an absolute manifold pressure of 1 bar (at sea level).
Actually, IIRC, 1 bar is not always the same thing as sea level pressure.
ANY throttled motor, turbocharged or not, will pull the needle into the white area to the left at idle or run-on, and move towards the right end of the white when you go to full throttle (it's called a vacuum gauge on a non-turbo, and goes from 30 to zero...). The difference is a turbocharged motor pushes more air into the inlet manifold and makes the needle move into the yellow as the boost pressure rises.
The OP's problem is that the boost is leaking out someplace. Often the leak is small, and under vacuum, will "seal" itself, but under any kind of boost, opens and dumps the boost pressure.
_______________________________________ Current: 2002 9-5 Aero Kombi Cosmic Blue 2000 9-5 SE sedan, Imola Red 1990 900S Rose Quartz, Auto Past: 1999 9-5 LPT Combi 1999 9-5 LPT sedan 2002 9-5 Arc 1990 900 5-speed 1986 900 turbo Convertible 1991 9000 turbo 1980 99 GLi 1986 900 turbo 1986 900 S 1991 900 turbo 1984 900 turbo 1976 99 GL
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