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As I have also stated before, your braking will begin suffer at the higher PSI where handeling is optimized. Anything higher than that will beyond a reasonable doubt negitivly affect your car. Don't believe me, go have a third party do some controlled testing. Your car will be engulfed in a cloud of tire smoke if you try to push it.
I and all other showroom stock racers will disagree with your braking suffering. In proven experience braking is improved because there is less deformation of the tire carcass at upper pressure limts. (don't misunderstand, I'm talking about 40 to 50 psug here, not 60 + psig)
The one change that we have noted in recent R compoundtires is their lighter weights and stiffer carcasses so pressures don't have to be raised as much on comp tires like they do on street tires. No one who doesn't like burning $10 bills to lite cigs runs race tires on the street.
And yes if you do drag race starts higher tire pressures simply don't hook up. But once you get going rigid carcasses beat flexible ones any day.
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