Quote:
Originally Posted by kach22i
I'm not familiar with actual data on this, but phrases/experiences like the "steering got light" when going fast, and seat of the pants experiences going fast on a secondary highway with rolling hills feeling the car lift like a roller coaster ride is conformation enough for me.
The physics is there, the automobile will react to those forces be they F = ma in the vertical or aerodynamic.
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If you reduce the effective weight of the car by half through aerodynamic lift, you will decrease the unloaded car's suspension static deflection by half. If the car has a static deflection of (say) 3 inches, and you have 50 per cent lift, the car will ride 1.5 inches higher. That will increase CdA, and may well in fact cause further lift.
(The opposite happens when you lower a car* - Cd, CdA and Cl all tend to decrease. *Road cars, with normal ground clearance.)