Re: Can a 900S '95 be turboed? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Can a 900S '95 be turboed?
Posted by Dean (more from Dean) on Wed, 14 Feb 2001 09:45:42
In Reply to: Can a 900S '95 be turboed?, Arne, Tue, 13 Feb 2001 22:38:14
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Your compression ratio is too high. So the amount of boost you can apply will be small. The cams will also have too much overlap as well. As you cannot apply much boost, the fact that your engine does not have oil jet cooling for pistons will not be a problem.
Your air mass meter will allow some boost. But often, they ECU will cause a fuel cut at some point where the air flow signal value is considered a malfunction.
While on boost, your mixture will knock. You would need a rising rate fuel pressure regulator. These are often inadequate when the manifold pressure is near one atmospere, as the richness is not then happening and the stock engine would be near knock anyways. The stock ECU probably is not going to be retarding the ignition timing properly.
The stock engine and its motronic controls are probably not the way to go. If you are going to all of this trouble and expense, you want more than a low pressure boost.
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