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Originally Posted by Deslock
I'm not sure where you're getting that from, but the RX8 didn't make anywhere near 220 whp. By the simple weight & hp formula, 207 whp is needed for 3050 pounds and 95.5 MPH, and the RX8 didn't make anywhere near that either.
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You forgot to add weight for the driver and some fuel. Try it again with 3250 lb. instead of 3050.
Mazda lied about the RX-8's hp, but not by THAT much!
[edit]Oh yeah, the formula is for flywheel power, not rear wheel. RX-8 rwhp ~185-190 from what I've seen.
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It's worth noting that formula only provides an approximation as it doesn't account for things like traction, temp, air density, and CoD (which is quite low for the FT86).
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Especially for lower-powered cars, traction doesn't affect trap speed much.
Some mags correct 1/4-mile results for temperature and air density.
Minor differences in drag (Cd*A) won't change results much.
The equation *is* a quick/dirty approximation/estimate. But it's a very good one for getting in the ballpark.