Some spoilers can function like a crude wing, though. That's kind of how the stock car spoilers/wings work. They aren't as efficient as a wing but the size and angle of the blade has an impact on the downforce they can generate. It doesn't look like it, but a stock car can generate around 2,000lbs of downforce at speed with the rear blade at a high angle. Obviously the shape of the body comes into play but that rear blade is doing something more than just reducing lift.
There's a reason why when, on a high speed track, a car passing closely on the outside can cause the inside car to spin out since the passing car can reduce the amount of clean air flowing to the inside car's spoiler... loss of rear downforce, loss of grip, loss of control.
I think they are a little different than a typical street car spoiler.
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- Steve
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