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Originally Posted by SVOboy
Haha, I meant that fugly spoiler, sorry!
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Is that yours?
Man, that shape is a great base to work from. What year? Do you have the specs on it such as kerb weight, Cd (
believe it to be 0.32), base mpg, etc?
How much cleaning up is there to do on the underbelly? I assume it would be fairly typical for such a car. The great thing about something like the CRX is that it's already pretty good for a car - small, and modest fastback design. So compared with something like mine which I imagine would get at least upwards of 0.35, probably a bit higher (it's shaped like a miniature minivan so should be similar), it gets most of its improved Cd from exterior modification - the basic shape.
Which is great, because in an attempt to get a low drag, they have done most of the work with the exterior and left all the easy bits for you - i.e. undertray, wheel skirts, wheel covers, deflectors, grille. Which means that there is more potential for drag reduction. You can get your car looking more like a streamlined body than my dustbuster - smooth a semi-streamlined body, it's always going to beat a smoothed dustbuster.
I'd hazard a guess that with a flat car design like yours, you'd get even BETTER results than mine for doing the undertray, simply because you have a wider undertray.
And to compare the base CdA figures, mine probably has a Cd of 0.36. Using the gross approximation of the car having a rectangular cross section, my base time height is 3060 square inches. Yours is 3246. That means to compare the two, your CdA would be 6% better than mine, with more scope for improvement. I suppose it's not that much different, now that I think about it, but I think that your advantage would swell to something like 10-15% once we had both maxed out aero mods. (Actually now that I think about, your frontal area is better than it appears, because it tapers to the top. Which means that your CdA figure will beat mine by probably 12-17% once everything is said and done. Bugger.
I'm envious.
The only thing is, they've stymied an attempt to further reduce drag with a boattail by flaring the edges too early (but probably optimal for that length).
I wonder what sort of FE numbers you'd get if you dropped my 660cc EFI engine in there (daihatsu EF-EL)? Since the weight is comparable, you should get similar performance to my car.
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