Quote:
Originally Posted by pride355
If the charts located at this link http://www.m3post.com/forums/showpos...7&postcount=17 is at the rev limiter, then E9x M3 could do therotical 316 km/h in 6th gear; not 302 km/h which surprised me a lot when I first read it and responded immidiately with the above post.
This kind of therotical top speed (that is 302 km/) is really not BMW style.

The figures posted are an approximation of the
true speed i.e. the 302km/h is my "desktop" approximation of the true top speed of a 6MT M3 (assuming no electronic speed limiter). Here is my methodology:
First I calculated the
theoretical top speed following this:
Quote:
Originally Posted by swamp2
Tire diameters are: std. calculation:
Without tolerances: [(265 x 0.4) x 2 + (18 x 2.54)] * pi = 2.10m

The theoretical top speed for the M3 I came up with based on the above (assuming 19" 265/35 tyre)
is 315.4km/h for the 6MT and 335.4 for the DCT.
Then what I have done is to apply a 15% "tyre distorition factor" (which basically is a manual factor adjusting for tyre compression at higher speeds) in order to come to an approximated
true top speed. The 15% figure came by comparing my theoretical speeds at redline for each gear of the DCT versus the actually measured true speeds for a stock DCT as these were measured by GPS equipment from a reliable Greek auto magazine. I was happy to see that my 15% correction factor was uniform accross all DCT gears and yielded the same true speeds as those measured by the magazine.
Then I applied the empirical 15% distortion factor to all gears of the 6MT.
The
true top speeds I came up with are 302.3km/h for the 6MT and $321.4 for the DCT (assuming no electronic limitation).