Z214's come in 3 compounds I believe, all of which should work fine on track. The softest compound will most likely die after a half hour of lapping, but they should be fine for qualifying and sprints. Corvette guys run A6's during sprint races if that tells you anything..
that being said, no I dont have any actual track experience with these tires. Doing track days on slicks seems like a waste of money IMO. Get yourself some RA1's or NT01's, they will last much longer.
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