Date: Sun, 12 Jan 2003 11:46:50 GMT From: Paul Halliday <pjghnopsamyonder.co.uk> Subject: Re: 9-5 Aero Raves & Rants (mostly rants)
in article 3E206B7B.782D4C5Dnopsamsizefitterzzzz.com, Johannes H Andersen at johsnopsamsizefitterzzzz.com wrote on 11/01/2003 19:07: > Paul Halliday wrote: >> >> in article Xns93006A7DF27AFfritzfriicomnopsam17.128.40, Gary Fritz at >> fritzxxxnopsamrii.com wrote on 11/01/2003 17:28: >> 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. > 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. It does sound very laggy doesn't it? The C900 turbos I've owned have been very responsive. The turbo spins up as the revs climb and boosts when you want it. It could be controlled a little for better boost on well timed manoeuvres by holding in the broken white zone on the gauge briefly before letting it go. I'm not sure of the answer here. Your suggestion that the bypass valve, or the wastegate, could be altered to reduce top power might ease the situation of what sounds like too much power. It don't think it would help with the lag though, but the boost curve as a whole might feel more comfortable. Paul
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