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Date: Tue, 14 Jan 2003 21:58:14 GMT
From: Paul Halliday <pjghnopsamyonder.co.uk>
Subject: Re: 9-5 Aero Raves & Rants (mostly rants)


in article Xns93039582E349Cfritzfriicomnopsam17.128.40, Gary Fritz at fritzxxxnopsamrii.com wrote on 14/01/2003 21:41: > Paul Halliday <pjghnopsamyonder.co.uk> wrote: >> Well, no, I don't think you are wrong. The manual for the C900 says it >> should not enter the red, but may under certain circumstances. > > The Aero manual sez: > > "At low loads, the needle will move within the white zone. At higher loads > and during heavy acceleration, the needle will enter the yellow area. At > very high loads (certain variants only) the needle may enter the first part > of the red zone without indicating that there is a fault. > > Under certain barometric conditions the needle may enter the first part of > the red zone without necessarily indicating that a fault has arisen. > > If the needle repeatedly enters the red zone and the engine at the same > time loses power, because the monitoring sytem is holding the charging > pressure down, you should contact an authorized Saab dealer." > > Mine normally enters the red under heavy acceleration, and it does not lose > power. That's where it gets the MOST power, when it hits the "slam you > into the seat" phase. > > Maybe running at 5000' elevation affects it? I see. You do get better turbo performance with less outside atmospheric pressure. I think any turbo owner will tell you they get different performance depending on the weather. Since you do not lose power in the red zone it's very likely that the external atmospheric pressure is an influence here. This is no doubt a contributing factor to the sharp tail off as well >> I'm sure Gary's car is not setup right. It's only when he mentioned >> the behaviour of the gauge that I fully understood what he was >> experiencing. If it's been tinkered with like that (I shudder to think >> about whether knock-sensing has been disabled), it should be setup >> correctly as soon as possible to prevent any permanent damage. > > It hasn't been tinkered with, at least since it was new. The trip to the > dealer for the 10000mi checkup was the only time (well, and one other oil > change) that anybody's been under the hood. Well, and one other oil change > at 5000mi. *I* sure haven't messed with it. I'm sorry for suggesting it has been. In that case, we're back to square one with suggestions. I think making an adjustment to the wastegate will generally help the overall boost curve and rid you of those uncomfortable top boosts. Do you really need that kind of power? I'm not sure what to do about the bottom end though. Have you thought about moving down from the mountains? I suppose a good comparison for you to make would be to take a weekend drive to the coast and see if you like the way the car handles at sea level :) Paul 1985 900i 16V 1989 900 Turbo S http://pjgh.go.dyndns.org/saab/index.html

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