Quote:
Originally Posted by 67-ls1
I'm now driving my 66 Chevelle eco project and am getting over 30 mpg.
Im working on a front air dam now and will probably add a small splitter to the bottom of it.
is there any kind or a rear spoiler I could add to the rear of the trunk lid to help airflow off the back?
Either a small wickerbill or a flat extension. Which would be better for economy? I don't need downforce.
And how do I calculate the overall height or length and the fore-aft placement along the trunk lid?
Thanks,
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Why not just do some testing?
Is there attached flow on the rear window and trunk? Tuft testing will show you that.
If not, a flat extension spoiler will do nothing. And if not, to gain flow reattachment, you will need to lift the trailing end of the trunk (eg by a raised spoiler or 'wing' (that isn't).
Throttle stop testing (other thread) will also show you if you're managing to get a decent drop in drag (ie above a few percent).