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these are not simple equations when it comes to complex shapes; these things are usually determined emirically or using CFD software on Cataia models. there are no good simple kinematic equations here; everything is a diff eq. read up on the bernoulli effect.
essentially, to know the lift on the entire car, you need to know the difference in airflow velocity between the top and bottom of the car. this is of course a dynamic relationship. additionally, once you know this, it would be necessary to determine lift at the front vs. rear. i don't know of any way to calculate this for a complex shape.
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