Tyre Pressures

[B1 ECC]

What tyre pressures are the owners of 18inch rims running.
I'm still having problems with tyre movement. I've done a little research and it would appear that my pressures are to low especially for trackdays.

[steve_D]

Not driven mine yet but if you do a search there are a few entries including this

Steve
Edited to put in the correct link. Sorry.

>> Edited by steve_D on Sunday 9th May 08:51

[jschwartz]

I prefer tire pressures higher than those recommended by the factory. For track day use I like 25 psi all around. I run less for raod use. I am using Goodyear F1 Fioranos which have a very stiff sidewall.
Jeff

[bluesatin]

Jef

At 25 psi what are the temps you are getting across the tred block front and rear?

[jschwartz]

At Road America recently, about 120 deg F, maybe 5 degrees variation across the tread after a 20 minute session.
Keep in mind my "Worst Built Utlima in the USA" is so Bastardized from factory spec nothing I do applies to other Ultimas.
jeff


>> Edited by jschwartz on Monday 10th May 23:32

[bluesatin]

Looking at the picture on your profile you have two of the most perfectly formed Ultima that I have seen!

[B1 ECC]

Thanks for the info, I've been using pressures close to the factory reccomendations and sometimes lower to get heat into the P zero's.
This might be fine for road use, but not for track?
I'll move the pressures up into the 20's and see if I get the same tyre movement

[mkoch1]

jschwartz said:

At Road America recently, about 120 deg F, maybe 5 degrees variation across the tread after a 20 minute session. Keep in mind my "Worst Built Utlima in the USA" is so Bastardized from factory spec nothing I do applies to other Ultimas. jeff >> Edited by jschwartz on Monday 10th May 23:32

Don’t feel bad Jeff, my red headed step child canam will soon be joining your exclusive club.

mark