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      04-03-2013, 11:34 PM   #30
kotik
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Drives: e90 M3 ESS 575
Join Date: Jun 2011
Location: Germany

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Quote:
Originally Posted by CanAutM3 View Post
I also come up with 196mph (315km/h)

The formula:

Speed in km/h = RPM / Gear ratio / Final Drive * 60 * (Tire width * Aspect Ratio / 100 * 2 + Wheel Dia * 25.4) * 3.1416 / 1000000

RPM = 8400
Gear Ratio = 0.872
Final Drive = 3.846
Tire Width = 265
Aspect Ration = 35
Wheel Dia = 19
Tire size is 285/30-19.

Hmm... maybe i had a bad calculator before.... My math is bad this morning... so what is the descrepancy % if shown speed is 337km/h?. About 7%?
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