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There are alot of factor when you start working out the vehicle dynamics.
Generally rule of thumb is that the lower control arms cannot be lower than when it is parallel to the ground.
If you get pass this point, that is when the roll centre really start getting out of whack and you start seeing performance reduction.
But if you compare it lap time against lap time to a stock suspension, very often aftermarket suspension still fair better due to increase in roll stiffness from higher springs rate and damping rate.
It is never clear cut black and white.
And what works for one may not work for another.
But these rule of thumb are there for a good reason, and generally they give you a pretty accurate result; but not always.
Jerrick
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