Quote:
Originally Posted by CanAutM3
I am curious on the mathematical formula you used to calculate 0-60mph from a 0-100km/h number  |
A very rough approximation is the following:
t(100km/h) = t(60mph) * 1.036
This simply assumes that the acceleration from 60 mph to 100 km/h (about 2 mph change in speed) occurs at a constant acceleration and is equal to the average acceleration during the 0-60 mph portion. This is accurate to only about 25% for the M3, it predcts 0.15 s but the actual result is about 0.2 s. The largest error is due to the fact that most of the 0-60 time is in 1st gear but the 60 mph to 100 km/h is in second gear.
For cars of this rough power to weight 0.2 - 0.3 is a very good rule of thumb and better than the formula.