Quote:
Originally Posted by ZDan
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!
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.
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Oops you're right I did forgot to add for the driver, but I still don't think that formula is accurate enough to indicate whether it was 2933 pounds or 3029 pounds (especially given the variance in quarter mile results... I've seen a lot more 93-94.x than 95.x trap speeds reported).