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      11-24-2013, 05:28 PM   #70
CanAutM3
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Drives: 2021 911 turbo
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Quote:
Originally Posted by swamp2 View Post
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.
Agreed. This is in line with what I would have predicted.

I expected 4.1-4.2 0-60mph from the advertised 4.4 0-100km/h. Not 4.3 as the OP posted. This is why I asked what formula he used.
Appreciate 0