Quote:
Originally Posted by Vman455
After trying coast down testing several times this summer, I agree with all of this. It was just about impossible to get data consistent enough to show a change in drag with the windows up versus down, let alone try to calculate the cD with that spreadsheet (which I tried the first time. It came up with a radically different cR and higher cD with windows up than down!).
I wish there was anywhere here that I could do 100+ mph legally.
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I think is quite impossible to calculate the Cr without all coefficients and data of tyre and tarmac.. i used the formula that at least considers pressure and speed but i know there is an approximation error