Hankook tire pressures?

[Ralf]

Last year I was running on some old Hoosiers but this year went with new Hankooks and had a heck of a time keeping it on the track. The Hoosiers started at 32psi cold but when I tried 32 psi on the Hankooks, I was oversteering all over the place. Some of it was probably the 40 degree track temp, but I think I had the most off track excursions out of everybody.
Any ideas for cold tire pressures for the Hankooks?
Thanks.

[jjjanos]

Any ideas for cold tire pressures for the Hankooks?

We found that dropping the starting pressures by 2lbs worked.

[Matt Rowe]

Cold tire pressures are tough to guess because there are a lot of factors that play into how much pressure gain you will get for a hot pressure. Nitrogen vs air, water content (even with N2, unless you are purging the tires) and even setup/driving style will have some effect.

My experience has been to get hot pressures between 42-44 psi which for me typically means starting at 35-36 front (FWD so more heat) and 38 rear but your mileage may vary. That is with N2 but without multiple purging cycles to drive out all the moisture.

[Flyinglizard]

Cold pressures are just a guess to hit your target pressures. They have no real value. The hot targets, are what matters. On a hot day the colds #s, are closer to the hot #s.
A road course has a dominant turn direction. Right . for most. My LF cold pressure may be 27, RF may be 29, LR 38, RR 39. MY target pressures are about 33-4 front, and 40 RR ,38LR.
Run the car 3 laps ,set the fronts to mid 30s, and go from there.
If the car is loose, lower the rears , but not under 30#.
You want max front grip, and you want to be able to adjust the rotation, by rear pressures.(less rear grip).
MM

[TStiles]

Hankook says 40 Hot and a couple of pounds less for light cars

[Ralf]

Ok, sounds like I just started with too low of tire temps.
Here is my video of the morning qualifying session. I had already done one lap trying to get temps up and still had to tip-toe around the track. Track Temp was around 40 degrees.

[ame]http://www.youtube.com/watch?v=OGIwr7PYREg[/ame]

The race was much better with higher front pressures.
[ame]http://www.youtube.com/watch?v=3zGWRT8GmOs[/ame]