Flatten it some more and let us know. - Saab 900 Bulletin Board - Saabnet.com
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Flatten it some more and let us know.
Posted by JohnB (more from JohnB) on Fri, 8 Mar 2002 14:55:30
In Reply to: Backpressure and Boost, John92900tc, Fri, 8 Mar 2002 13:49:40
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The general rule of thumb is one psi backpressure drops 4 psi boost capability for the turbo. But remember this is a wastegated turbo capable of over 20psi (ignore the efficiency map for a moment) so a minor exhaust restriction won't affect the turbo's capability to hit the engine's rated, what, 11-12 psi?
Perhaps the weather changed for the better...less humidity, lower temps, better fuel as where you live changed to summer fuel or you got gas at a diffo place, or even something else happened under the hood....
posted by 140.32...
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