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Brian,
I was careful to describe the behavior as street, not track. G force with street tires and springs will be under .9 typically. Race tires might bump that up to 1.5 G, so the camber figures that I state won't apply to the race track. Race tires like a bit of negative camber to compensate for sidewall flex, so I'm not surprised that race cars have such high negative camber. But - I wouldn't want to run high static negative camber because of tire wear and tracking problems.
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Richard,
I was afraid of the jacking effects too, so in our setup, I lower the rear roll center a bit with shorter springs and modified top damper mount. Our static (street) roll centers are still a bit higher than yours but they come down to similar heights when the car is lowered for the track.
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