Quote:
Originally Posted by chillsworld
That's only 1.65" difference in tire size? So by your examples and the above chart, tires should/could account for less than .02 or .03 increase in CD  I understand that percentage wise, that accounts for a lot of the cars drag, but it's still less than a third of the increase in CD from .22 to .32.
~C |
Okay now that you actually pull numbers up I'm starting to doubt myself.
I suppose the lack of wheel covers adds a little bit more, and the AMG probably has some kind of brake cooling duct which adds a little bit more. Still, does a radiator block really do that much? It appears to be the only difference. I am pretty sure all CLAs have underbody paneling.
If anything, I'm very skeptical about the 0.22 number. The Lexus LS460 has a longer tail and all sorts of aero features and fails to get close to 0.22.