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Date: Sat, 7 Sep 2002 00:20:39 +0000 (UTC)
From: "telboy39" <>
Subject: Re: 9-5 Aero turbo lag

Check to see if your dump valve is ok just in case the initial vacuum from the engine as you accelerate is opening it, this happened on my 94' 900T and made the car feel slow. "Gary Fritz" <> wrote in message news:Xns92816D8B048Bfritzfriicomnopsam17.128.4... > In most respects I like my 2002 Aero wagon just fine. But the turbo lag is > driving me a bit crazy and I wondered if something is wrong. > > I noticed *some* lag when I test-drove several Aero's. Some lag doesn't > bother me -- I've been driving Saab turbos for 14 years -- but the lag in > my car seems extreme, much more than I remember from the test drives. > > I can be cruising along in, say, 3rd gear at 3000rpm. Right in the middle > of the power curve. Then I punch it -- and waaaaiiittt. I've timed it and > it takes 1.5 - 1.8 seconds before the turbo spins up and the power finally > starts to level off! That seems like an eternity when you need power NOW. > > Even more annoying, it happens on every gear as I accellerate. For > example, say I'm starting out from a stop. I start out in 1st, and > actually don't notice the lag terribly badly other than needing to have the > RPMs up a bit before I even release the clutch. But then in 2nd, 3rd, 4th, > and even 5th if I'm accellerating to highway speeds, I upshift, and.... > wait... ahhh, *there*'s the power. It's nearly impossible to accellerate > smoothly because there's such a huge jump in torque from "when I release > the clutch in the new gear" to "when the turbo finally spins up." > > My '86 900 turbo and '88 9000 turbo both had some lag, but *nothing* like > this. Part of the problem may be because the Aero has so MUCH power once > it winds up, so there's a much larger difference between "pre-turbo" and > "post-turbo." But I'm 99% certain that the lag TIME is also much longer > than in my older cars. And I thought Saab had *improved* their turbo > technology over the last 15 years and reduced the turbo lag. > > My wife has an 18-year-old Porsche 911. I believe it's actually rated to > have less horsepower than the Aero (and of course it weighs a lot less), > but it *feels* more powerful because the power is there when you ask for > it. When you punch the 911, your head snaps back before your foot even > hits the floor. When you punch the Aero, you have to wait almost a second > before the power even starts to build, almost two full seconds before the > power maxes out. It makes the car feel really sluggish, even though it > does have tons of power once it gets going. The "ruler-flat torque curve > from 1800-4500rpm" doesn't do you much good if you have to phone ahead to > use it. > > Is this normal? Or should I take it back to the dealer and find out what's > wrong? > > Gary

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