QUOTE(SirAndy @ Jun 12 2013, 12:25 PM)
The 430 are too hard for AX, IMHO. I'm running the 250 which are the softest GY you can get and even those never get up to temp.
In my experience, they work better with much lower pressures than one would usually run.
I've tried everything from high 30s down to 15. Depending on the surface and ambient temps, i found the sweet spot for me to be in the low 20s.
The car will feel weird with that low of a tire pressure but actually stick better. Once you get used to the odd feeling.
Try starting out in the low 30s and go down during the day and see what that does for your times ...
Andy is right, although having run Goodyear for a long time, I'd even start lower.
My sweet spot was running 250's 18/20 or even 17/19 (F/R) on a 1700# car. Get them hot and they will make your day! They definitely go through a metamorphosis when they get hot, i.e., from mechanical grip to sticky grip.
Like lap 3 at Medford after having run through 30 corners on the way to 65 corners in a 4+ minute run.
I would guess that Paul (URY914) with his super light light weight 914, probably runs in the 20's.