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Originally Posted by ennored
Thick boundary layer -> less base drag (via less jet pump affect)
Can the affect also be measured as a pressure increase on the back of the car? Did you have sensors on the back of the Tesla?
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No I didn't think until afterwards that I should also have measured base pressure on the Tesla. But I can easily disturb side flow on another car and see if side pressures decrease and base pressures decrease.
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And related... Same idea apply to vortex generators? That is, they upset/disturb the jet pump action?
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Despite the claim often being made, I've never seen any evidence that vortex generators work in altering base pressure. They certainly can work in putting energy back into the boundary layer and causing better flow attachment around corners, but that's a completely different thing.