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So, using the data from the spreadsheets and my model, I calculated the Cd for the baseline and then the final run, which had lowering, lower extended, spoiler, and grille block.
The baseline Cd was 0.52 and the second one was 0.46. The rest fell somewhere in between, but in the interest of time and my sanity (I do monotonous calculations all day at school), I didn't calculate them.
Needless to say, that is substantially higher than the actual number, which I found on wikipedia to be 0.36 for the generation of civic right after mine. They have a very similar shape, though, so it should be close. So, I guess we could adjust these drag numbers down by multiplying them all by (.36/.52).
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