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my only experience with R compounds were with the Nitto NT01's, and it wasnt my z it was on my 06 mazda mx5. i didnt get them heat cycled, but i did put them on, heated them up for the first time, and also jacked up my car for a little over a day. I autocrossed with these tires, and never took them off the car, drove on 'em almost every day, got over 8,000 miles out of them and about 10 autox's. However this was on a 2450lb car, do that with the Z, and im sure the addtional weight and additional power will kill the tires 2x fast.
anyway, after i broke them in, my first 2 autox laps, they SUCKED!! Understeer here, understeer there, little bit of over steer. After that, they were amazing, i never got the car to understeer ever again, incredible tire. For Autox i ran 45psi up front and 42 in the rear, that gave me my best results, however again, that was with a mazda not a Z, tire pressures surely will be different.
The only down fall is that after you drive on a R compound, you will never ever want to drive on any street tire again, nothing compares. Even for spirited drives, the R compounds were sick.
Good luck!
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