For you 944/951 track guys running RA1s:

What hot pressures do you shoot for to obtain maximum grip. I'm getting a set mounted on Monday, my first set of RA1s after years of using MPSCs.

Is the target hot pressure staggered front to rear, or the same at all four corners? Michelin recently began suggesting using a staggered setup; with a two pound variance front to rear (fronts 2+ higher than rear.) This has actually worked out quite well.

What works best for RA1s?

TIA

 

I try to get 40lbs hot on all 4. I run 245's all around.

HTH

 

not Pcar related, but RA1 related...

in the Talon we run the same size tires all around and shoot for 40# hot also.

 

I just recently started to do lots of track events. The recommendation I got from a couple of different places is also to shoot for 40# hot. I'm running 225/50/15 RA1 on all four corners.

 

Same here - 40 hot, 225s all around on a 2750 lb car.
alan

 

38-39 hot all around on 225's. Car weighs around 2600 with me in it.

 

funny enough i have used a few sets now and i get the best grip at 32. thats with 255 and 275

 

38-40 hot on my spec car.

 

i am talking 32 psi. whats that in lbs

 

It's still 32 lbs per square inch.

 

I run RA1's, 245/46/16 at all 4's. I look for 40psi hot, I usually run with one pound less in the rear, except for last weekend where I was at an unframiliar track and had to make a "adjustment" for understeer. I went 2psi higher in the rear and it helped. Talking to tire guys their advise is 40-43psi on our car(3,000lb) and 25-30 heat cycles for competition, not practice. I have found this to be true, other racers can run forever on a set, but mine seem to loose grip around 30...

 

good just making sure

 

39 front all around. I have founf that you if you are off on your cold pressures and you hot makes it over 40 the grip goes away very quickly. I have been to 41-42 and the car is all over the place. Did you get them shaved?

 

Thanks for all the input guys, excellent feedback, I appreciate that.

Skip -- I didn't get them shaved, as I needed to get them in quickly and their shaved tires would have taken an additional 5-7 days to deliver. So when you're kicking my a** on Friday at Nelson's, it's because my tires blocks are all squirmy due to the full tread. That's my story and I'm sticking to it.

 

I agree with Skip, 39-40+ psi and all hell breaks loose. (shaved)
Brian