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"Race car Aerodynamics" By Prof. J.Katz (Pub.Bentley) deals with ride height in chapter 6. He shows that a front wing will achieve double the downforce of the wing alone if the ride height over chord ratio (h/c) is less than 0.3.
Elsewhere in his book, he says that "ffor ground clearance of less than h/c=0.5, the lift can easily increase by 50%"
But he also makes the point made above - airflow is dependent on so many other factors, in and around the car, that an absolute relationship is impossible.
I recommend his book to anyone with an interest in car aero.
John
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