Gary Z

Well, your average speed for the sixty feet is (obviously) 60 feet per 1.5 seconds which is equal to 27.27 miles per hour. Assuming linear acceleration, your instantaneous speed at sixty feet will be twice your average speed which is 54.55 miles per hour. OK, we’re talking about zero to 54.5 mph in 1.5 seconds. Suppose we’re also talking about a manual transmission with a first gear ratio of 2.66, 26-inch diameter wheels, and a 4.11 ratio rear gear. Then, assuming you are still in first gear and not spinning, your engine speed will be 7700 rpm. Is this beginning to seem a bit fantastic? Do quick M6 guys hit second gear before sixty feet? How fantastic is a 1.3 second sixty? Any comments or corrections would be welcome.

OutlawZ

iTrader: (4)

wow interesting theory.....

I don't think the acceleration will be linear though..... And I definitely can't see anyone doing 60 by the first 60 feet.... 60 feet is a pretty short distance.... Then again a 1.5 60 foot is plenty enough power to hoist the front end so it's definitely sub 3.0 second 0-60 easy....

Gary Z

This is a very good point. A more reasonable multiplier of the average sixty speed might be 1.75 rather than 2.0 In that case, our instantaneous speed at sixty feet would be approximately 48 mph and engine speed (still in first gear) would be 6750 rpm - much more reasonable.

Bitemark46

I don't think that m6 guys are shifting before the 60'. I have 4.56's, 26" tire and a 3.37 first gear ratio and I shift just about at the 60' marker. It would be cool to find out what my 0-60 is. -Mark

Gary Z

If anyone is interested in my simple model they can download the attached excel workbook. The constants in column H have names like "RearGearRatio" and it is easy to change them to other values.