First off you are NOT slow! A very low 159 is a very good time in 100+ deg temps. Tire wear at those speeds and temps will be high, the only other thing that you may have already tried would be soften the rear bar. I will be going to Buttonwillow next weekend to see if I can give the NorCal guys any challenge, hoping the temps will not be like what you had last weekend.

Mike

 

I'm coming to the conclusion that "it is what it is" with these R6s and that my car and driving style won't get me more than 10HCs.

Are you running R6s also? I agree that camber of -2.0 in the rear is better for R6s. The problem is that it's not enough for Hankook TDs that I'm also running. The TDs tend to wear more on the outside indicating that they would like a bit more camber than the -2.5 that I have. You can see from the picture I posted that the outside edge is not far behind. In my estimation, 1-2HC. Reducing camber in the rear would get me at best 2 more HCs on R6s but would kill my TDs.

BTW, Hankook TDs in 295/235 are faster than R6s for me by ~1-2sec. I'm also getting more HCs with TDs. Only problem right now is that 295s are impossible to find

Didn't try softening the rear bar, the car handles good right now so not sure I want to change settings. Have fun at Buttonwillow. I wanted to go for that one but impossible due to family commitment.

Chuckwalla this past week-end was hot as Hell, literally! Still managed to have a good time despite all my tires problems: corded R6, blew a front TD on track and corded my pickup tires!

Here is my TT run from Sunday. This is HC 4 of my 315/255 R6 set. If you watch the temp needle, you can see it increasing as the time goes. The video is lap 1-2 after warmup lap. Look at outside temp on the dash! First time I overheat with the car, I could do ~3-4 laps and had to do a cool down lap.

 

i like slick or nitro
i run -3.5 to -3.75 front and .5 to .75 less camber rear.

 

ti jean great driving love that dash..what system are you using for data?

mk

 

Thanks! Data system is Aim SoloDL. I'm using Dashware to overlay data and video.

 

Several of us on the east coast were having the same problem. Cording on the inside after a few heat cycles. Same tire. Noticed your pressures were 34 hot. And I was running the same pressures. We went to our tire guy at Radial Tire in Maryland. He is a major Hoosier distributor out here. HIs info from Hoosier was that Hoosier said to run pressures at 39 - 40 hot. Now have two sets of Hoosiers, one with 14-15 heat cycles and the other with 19-20 heat cycles and no cording.

Might be worth a try.

 

Thanks for the info I have a set with just a 3-4 HCs on them. Will try to increase hot psi to 39-40 and see if I can get more HCs. That would be awesome if it works

 

^+1

34 is too low, you need more psi to even out the wear. I run mine at 38 and get even wear. 3.3 degrees front, 0 tow; 2.1 degrees rear, 2mm total toe.

 

u should flipped them after every 4-6 HC and you can get more than 10-12 hc

 

yes, the really really fast guys with good car control run 38-39. car is eaier to drive at lower pressure but faster at 38-9 and last longer.

 

Seems counterintuitive to me. ;-) I see it more as a trade off: go faster at lower pressures but they won't last as long.

Running higher pressures allows them to last longer and requires higher skills because they have less grip, while lower pressures instill more confidence and are easier to drive because they have more grip - at the expense of shorter tire life.

I have -2.0 degrees negative rear camber and am now running 36-38psi hot which yields a reasonable combination of confidence, feel, grip, speed and tire temps. However, I had a rear inside edge that was starting to cord at 16 HC (6 Summit Point and 10 Mid Ohio), so even though I like the feel of lower pressures better, I might try 38-39 hot to see how that feels. Granted, while Mid Ohio has a relatively low grip surface it wears tires more than most tracks due to the very high lateral weight transfers and sections that push excessively. I once erased all grooves on both brand new left side tires in one day in my RSA!

Another interesting characteristic of Hoosiers that seems counterintuitive is that the center can have accelerated wear when the tires are under-inflated. Something about the way the tire shape changes under load when under-inflated. In a typical street car or trailer tire a worn center indicates over-inflation.

There is one safety factor associated with Hoosier tire pressures that came directly from Hoosier but wasn't widely distributed. Hoosier sent guidelines to distributors in about September 2012 saying that when driving tracks with excessive loading due to high banking - but also citing Watkins Glen due to the loading induced being similar to a high banked oval - that tires should be run at 40-42psi to increase the load capacity. I can't find it at the moment, but am trying to get another copy and will post if I do.

 

^ yes, counter intuitive to me as well. but the truly fast guys, not always porsches all prefer the high pressure. even in a lwt s2000, they run it at 38. it's not for saving tires, but for absolute lap time. they run the high pressure in races to. since they drop me like i am parked with 150hp or 200hp less than i do, i didn't dare argue with them

 

I appreciate the info and will experiment with the higher pressures, thanks! Much easier to do with the GT3 than my RSA; I loved that car, but the performance and forgiveness in the GT3 is simply astounding - wow!

Fortunately for me the next track I will drive is extremely easy on tires (Road America). Where Mid Ohio was the track that most favored the lighter weight of the RSA, Road America is the one that will favor the GT3! :-)

 

Hoo hoo's are faster when 38 or higher. Turn in is more precise. I tried 30 before- not so good felt sloshing around the turns. But if u do kuhmos it has to be 32 or lower. Mike

 

Mike. West coast pressures must be different.

Maybe on bumpier tracks pressures need to be lower cause hoohoos drive like grease that high at Sebring. I've tried it several times at higher temps felt like rally driving. A bunch of fast gt3 drivers find the same here

33 hot. My pyro reading great and good grip.


Mk