Quote:
Originally Posted by CanAutM3
Incorrect. Cd are empirical numbers that are calculated off the actual measured aerodynamic drag of the car obtained in either wind tunnel or road testing.
Tire width would definitely affect the Cd value, but all tire options are the same widths.
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did some more reading and it turns out you are right. i had read somewhere it was generated by CFD
but what i don't understand -
M550i Cd is 0.22
M340i Cd is 0.23
Why is the M3 so bad?