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Back a decade or so I was measuring everything and on a 1983 8v turbo I measured back pressure at 5500 rpm and 7psi at 21psi on the exhaust manifold. Basicly three to one with stock turbo and stock exhaust. I also discovered for every pound of back pressure I lost after the turbo I lost 2.5 psi before the turbo. After changing to an Aerocharger I could get the ratio of boost to back pressure down to 1 to 1 at any load or boost setting upto the 14psi we were working with at the time.
Brad
posted by 209.172.21...
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