Quote:
Originally Posted by smeghead
On Pirelli Diablo Supercorsas the accepted optimum pressure is 28psi f & r hot (track).
Race 3 as it woz cold & a bit wet I started the day at F33 & R31 & worked my way down as the day/track warmed. I did a PB with this (relatively) poor level of grip (I love these Pirellis).
In the cold & wet the tyre temp gradiant is less so the pit start pressure is higher to get to optimum track pressure, in the heat it's the opposite. Also in the wet higher pressure keep the tread open to clear the water.
In the cold & wet, when grip is a lot less, getting feel from the bike is more important so instead of dropping pressure to get more temp from carcase flex try softening the suspension a bit. If you can read what the bike is telling you about the level of grip then everyone wins & everyone is safer.
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imho there is risk of confusion between pressures for track tyres and street tyres.
a pilot power (or any street tyre) is no where near the stickiness of a diablo supercorsa.
a sticky race tyre is designed to withstand constant abuse. Its never not accelerating flat out, spinning as fast as the bike can go, braking to the point of skidding or cornering to the point of sliding.
the faster you want to go the stickier the tyre needs to be and somewhat counter intuitively a softer compound tyre is harder to put heat into ie: it needs that abuse to achieve operating temperature.
a street tyre like the pilot power is designed to be sticky at much lower temperatures than a DOT race tyre and come up to operating temperature under conditions much less abusive than a race track.
finally i dont disagree with you envee, scroll up you will see i dont run higher than 35psi in a rear pilot power (and thats for a 38C track day). Ive not run 40psi in a tyre since i was riding 250's and a complete n00b although i thoroughly recommend learning on 250's with BT45's or similar at 42psi
edit: i suppose the best advice is if dragsta has found the limit of pilot powers, it may be time to start rolling on something designed for the track. although somewhere in twist of the wrist keith code advocates learning to ride fast and to slide a bike around on less sticky tyres. its a lot easier and safer to practice sliding at 40 degrees of lean angle than at 50.
