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Old 03-25-2008, 08:03 PM   #2 (permalink)
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Join Date: Jan 2008
Location: Mirabel, QC
Posts: 1,672

The Guzzler - '08 Hyundai Elantra GL
90 day: 33.12 mpg (US)

Got Soul? - '11 Kia Soul 2U
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Ah, the Jaray shape, I really like those designs from an aesthetic standpoint.

Honestly, I would not worry about the vortices, you're always gonna have two trailling vortices unless you have something close to a round boattail. Plus, you car is pretty well designed when you look at the c pillars and the slope of the back light.

One thing your car could probably benefit from is a lip spoiler that would otherwise be a decklid extension on a notchback as the B angle in your illustration is borderline. You should first check if you have an occurence of that arch vortex on you car or if the flow simply detach somewhere on the back light. One very easy way to ckeck would be to do some wool tuft tests at the bottom of the back light. You can even just apply wool tufts on one side, but do the test in to directions to account for sidewinds.
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