Go off as in overheat to the point where they just don't dig in and drive (tyre becomes too soft and defroms, I believe) like they were before.Originally Posted by Dafe
Generally you should drop the pressures for any tyre when going from the road on to the racetrack, so as to get a bigger contact patch, and allow them to heat up more (not sure exactly why tyres with more air in them heat up less...partly to do with the fact there's a smaller contact patch, but also some other phenomenon involved. I was told once, but forgot).
As Pilot Powers already heat up more easily than your average tyre, they need less help (in the form of dropping the pressures) to get extra heat in to them. I know for a fact that in the second to last session at Puke one day, my front had leaked a bit during the day, going from 33 psi at the start of the day to 24 psi in that session. By the 3rd lap, it was already giving me that sensation that a tyre does when it's overheated, or 'gone off'.
Just do as you would do normally on the track dude. If, when you start pushing the beast, you do consistently experience a loss of grip and a strange (squiggly? spongy?) feeling, which leads to understeer (if front overheats) or oversteer (rear overheats), try applying the above theory.
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