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i should have qualified my comment by saying that it wouldn't be terribly streetable if you went much beyond half of what the supercharger would do. by streetable i mean mixture correct, good cold starts, not having to raise the idle, yada yada. turn key normal in operation, daily driver reliable in all weather, just as if nothing had been done.
at 180 at the wheels, you would be making about 215 at the crank. a far cry from 250+, and more like i would expect. to answer the math question, drivetrain loss is a fixed number, not a percentage like many think. were you to use the standard 15% for drivetrain loss though, you would end up at 207 from 180 at the wheels. even farther from 250+. just as a note, both of those numbers are about half of what the supercharger would do. the supercharger would push the entire curve though, and not just the right side.
the real problem with cranking things up normally aspirated is that the curve gets really spikey. horsepower numbers are pushed to the right of the curve. the thing that makes a car go fast is torque. widening the torque curve, and pushing that up is the key.
like i said, it's diminishing returns. you end up spending a lot more money trying to do it normally aspirated, and generally lose reliability in the process.
again, not selling the idea. just pointing out some realities. i've done it just about every way that can be thought of, and all of them have their own plusses and minuses.
i look forward to seeing the charts though. i'd like to know just what somebody can do, in streetable trim (not interested in race car setup).
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