Besides length, my guess would be that the sides weren't helping due to not being right at the edge of the car for obvious legal reasons, and the bottom should probably continue straight back from the end of an underbody panel (it may already have been doing that, it's just hard to see from the photo if such was the case).
Vortex generators are quite debatable as to whether they improve or hurt fuel economy, but
this article talks about someone fixing a similar detached airflow spot on the rear window and trunk lid of his Mercedes. Might go for an interesting ABA test.
Quote:
Originally Posted by 19bonestock88
I’m getting to where I wanna redo it though,(though I am thoroughly in love with the look) I shoulda chose some better coroplast, taken more time with my cuts, made my underside supports more carefully...
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What do you use to cut coroplast? Unless it's straight lines, I find it pretty hard to get a "perfect" cut on coroplast, no matter what I use. I haven't tried a jigsaw yet though lol..