Quote:
Originally Posted by Piotrsko
Total drag should increase as a result of speed increases. If it didn't, everybody here would drive like everyone else@100 mph and there would be no reason to add aero
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Of course. I was being a bit pedantic in pointing out that the coefficient of drag, which we usually assume is one static number, it isn't really static. It varies with the air's speed, density, & viscosity. A rear diffuser shape/angle steep enough to be optimized for 40mph would begin to have some flow separation at 80mph.
Again, the differences are minute so you can just ignore it unless you're super OCD or trying to win a very close competition