Date: Tue, 11 Jul 2000 11:38:46 +0200
From: "Mads Lund" <Mads.Lnopsamin.Dk>
Subject: Re: Turbo specs on 9-3, 9-5 needed


"> Perhaps because the Opel engine isn't strong enough to handle > more power? Another factor is the imbalance caused by the asymetrical > loading caused by the turbo. Saab compensates for this by using > different valve springs on the two banks, but I wonder what would > happen if the turbo pressure was changed to the same level as > the Aero... Opel engine in a Saab ???? Are they completly off line. But I agree the solution sucks. V6 engines is designed fore twin turbo's and in that case would the 3.0l engine produce way above 300 hp. What about the cam timing, isn't that differet between the two banks ?? The different valve springs has no influence at low rpm, where the valve motion 100% is controled by the cam profile, and if the cam profiles are the same, will the exhaust resistance caused by the valves be the same. My suggestion on a suiatble solution would hav been to make a back pressure valve (simple seve controled rotary valve) in the exhaust pipe from the non turbo cylinders. And by having 2 pressure sensors, is it very easy to maintain the same back pressure on all cylinders. But it seems like they have employed a opel designer, so what can you expect ;-) But it could be quite interesting to find out of witch corpressor, and turbine configuration is used on the turbo. Because the fow in the compressor (even it is at very low boost level) need to be quite high. So perhaps is the turbo a mix of a GT 15 bearing, a GT 15 exhaust turbine, and a larger (gt 20) compressor stage. In my case not usefull, because the GT17 compressor is a bit to large, while the exhaust turbine is just in the small end for a 1100 ccm bike engine (GT20 turbine is prefferable) Mads Lund Ninja9R Turbo

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