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Originally Posted by morepower2
The question is impossible to answer simply. It depends upon backpressure, compressor and turbine efficency as well as how well the engines tuned, fuel quality and where in the compressor map you are dwelling.
It can go from almost nothing to as much as 30-40 hp at the extremes.
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I read somewhere that 1 psi = about 11 Hp. Probably 10 or 9 on a dead stock car , and the 160-200 Hp difference between the non-turbo and the factory 5 psi on the turbo Zs would seem to bear this out.