Quote:
Originally Posted by Vettezuki
The doubling per one bar of pressure is a rough, but fair rule of thumb. Obviously things like intercooling make quite a difference, but it gets you in the ball park.
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All things being equal, that may be true, but common sense says all things can't be equal. You are increasing air charge temps, which you have to compensate for by pulling timing, adding fuel, etc... You can run much more timing on 5 lbs of boost than you can on 12. You can also run leaner at 5 PSI than you can at 12. You also have to take into consideration the blower. How much parasitic loss are you going to experience from having to turn that blower? That will vary with the blower, but every blower will have some parasitic loss. If you add an intercooler, then some of these factors don't have as much of an effect. But we were talking abot enkeivette's car, which I believe doesn't have one.