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Date: Sat, 11 Jan 2003 19:07:39 +0000
From: Johannes H Andersen <johsnopsamsizefitterzzzz.com>
Subject: Re: 9-5 Aero Raves & Rants (mostly rants)


Paul Halliday wrote: > > in article Xns93006A7DF27AFfritzfriicomnopsam17.128.40, Gary Fritz at > fritzxxxnopsamrii.com wrote on 11/01/2003 17:28: > > > I gather from a previous post that you've driven other Saab turbos (namely > classic 900s). If I can gently put it, maybe you need to re-learn your turbo > driving style. The 9-5 is no doubt a very different beast to the older Saab > turbos. The one I test drove (just for fun) was exciting, simply put, but > I'm sure I would be in the same position as you if I had one. It did appear > too keen at times you didn't it and reluctant to "go for it" when you did. > > I often liken turbo driving to automatic driving - you need to work with the > car, rather than just instruct it. Tromping on the gas will not give the > full boost when you demand it, but I don't need to tell you that. Given the > fuel injection system on the 9-5, I would have thought that the boost curve > would have been more gentle than you describe. I would have thought that the > fuel injection would "fill in" the power band until the turbo was ready for > boost. As I said above, perhaps you just need some time with the car to get > to know it a bit better and learn how and when to apply the accelerator to > full effect for the turbo. > > If you're not that bothered about the full boost power, perhaps the ECU can > be slightly detuned to produce a more gentle spool-up. > > Regards. I hope it becomes a little less of an annoyance to you though. > > Paul > > 1985 900i 16V > 1989 900 Turbo S > http://pjgh.go.dyndns.org/saab/index.html But 2 seconds of turbo lag does seem an awful long time. I've never driven an aero, my 1993 9000 lpt responds instantly with no noticeable turbo lag. Only very occasionally do you notice the lag. Maybe the turbo by-pass valve needs adjustment. This valve lets the turbo spin when off power, so that it boost is ready when needed. Some people tinker with the by-pass valve thinking they can get more power by restricting its action, but the valve is there for a reason. Johannes

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