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roof spoilers
I tried an L bracket across the entire roof, just below the peak of the roof, so that it doesn't contribute to frontal area. The idea was to trip the air into following the rear windscreen better.
Cd 0.382 +55 counts
Fz 391 N -46 N
It did reduce lift but at the expense of a huge increase in drag.
Vortex generators: V shaped pieces arrayed across the width of the roof.
Cd 0.326 -1 count
Fz 420 N -17 N
Any benefit in lift and drag is OK by me. It doesn't hurt, and it may keep the rear windscreen clean. Definitely worth trying. it may work well in conjunction with a trunk spoiler.
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