Quote:
Originally Posted by ptitviet
Hello GreenTDI! Since you are now trying to see very little differences, I think it would be interesting to do some coast down testing. It helps you to get experimental values of rolling and air resistance.
I have use the "old" method but with better tools and found SCd values accurate to 2% to the real value.
Can you show on your computer display the driving speed? Then by recording with a smartphone your screen during the coast down you can get very good accuracy.
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That's a good and simple method indeed. I'm sure I will try this with my new wheels. I'm not taping my current rims again, it's not a sustainable solution.