Steve said he was at Roebling which is a real race track with a long history of club sports car racing. It also has a very long front straight where most cars run completely out of Hp trying to push air out of the way. I have run this track many times in a Lola S2000 car as well as my 986 S but I can't say what speed, as I don't look down much heading into turn 1 there.
I will avoid a useless internet debate over the application of sway bars.
Steve: if you send me data on your spring rates, and corner weights if you have the data (if not, I can use mine), I have some computer models that calculate natural frequency and ideal damping rates based on our cars geometry that I can send you.
I'm not sure about the ride height data that you gave, but I am guessing that it was measured from the ground to the top of the wheel arch. If so, the tire OD has a direct influence on the measurement, so that makes it hard to compare data, but I'm guessing that your ride heights are too low. One problem with running the ride heights too low on these cars is that the low control arm goes over horizontal, at which point you start to loose camber with increasing suspension compression. It is best not to go much below the OEM ride height on these cars.
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Kippis

986S
991S
Van Diemen RF97
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