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Hmm,
Well, a wing could be made allot more aerodyanmically efficient than a dam, or lip spoiler.
But it would have to stick way out in front, so that the gap between the car and the trailing edge does not choke off the air flow accellerated by the surfaces of the wing from flying upward. Wings work by throwing air off their trailing edges toward the concave curved side of the wing. The accelleartion of the air perpendicular to the wing, creates a reaction force (same as a rocket engine thrust) that pushes the wing towards the convex surface of the wing.
Your picture of the ramp is not a wing, and its not going to work any better than dam, I think.
Sticking so far out in front, the torque put on the mounting points is going to be tremendous. So it would take some careful engineering. To be effective, the wing would have to throw a whole bunch of air upward, and air has mass. And the fast you go, the more air per second you have to throw upward. And the more downforce there will be.
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