GTB/ZR-1

I'm going from V710s to S05s, as I'm giving them a shot because I've always run Kuhmos and getting the set on closeout from Hoosier.

What pressures are recommended for asphalt & concrete.

I normally ran 32-30 cold on my 710s & adjusted from there, a bit lower on asphalt.
Are the S05s very sensitive to cording the sidewalls if the pressure isn't high enough? The Kuhmos have never given me an issue in that regard.

Also, are they as sensitive (!) to heat as the 710s?

Thx ppl

MightyZR-1

Start there and you will be happy with the results. No sidewall cording issues!

TedDBere

Autocross: Hoosier A3S05s

Asphalt: 40/36

Concrete: 42/38

I never had heat problems with the S05s, but had to water down the 710s.

XPC5R

Water them down if they are hot to the touch, that will help. as for pressures, keep the fronts above 27psi, and as long as you have good camber (these tires love camber) you'll be set. Try the low 30's and the high 30's, and see what you like (or what the clocks and pyrometers say).

Looking at your sig picture, you have big wheels and look to be low and stiff. On our car 27 hot in front worked great, 21-22 rear gave very good bite.

TedDBere

How many runs did you get down at those levels? I dropped to 36/32 and corded my fronts with -2.0 front camber. Of course I'm only running 275s on the front in SS and they had 50 runs on them, but still....

Those look like A6 pressures.

XPC5R

I pull them off at around 40-50 hard runs, have not had any cording issues. Ran those last season, in 275/40/17 front sizes. The rears came closer on shoulder wear, but I tend to slide (actually I prefer the term burn) them a lot harder than the fronts.

2.0 negative is not enough for the low pressures, try 2.5 to 3. I 'm running just over 3 now, and that is just barely enough to keep up with the body roll, on a stiff car.

Fast_Toys

For auto-x where you don't get a big increase in tire pressure from the heat generated, I corded the outside of my front tires at 38 psi with 2 degrees of camber. I now run 42 front and 40 rear and have no issues.

GTB/ZR-1

Wow, these tires seem to be prone to cording...
I only run -2/-1.3, w/ heavy springs & stock bars w/ '04 Sachs shocks--relatively stock.
I've never had an issue w/ cording Kuhmos all these years & iterations.

I'll be running 315/335 setup. I tend to like a bit of tire compliance, so I run on the lower side of pressure.
Heck, you guys have me as to what to run...

gonzalezfj

The S05 tire is know for its tendency to cord. My cor-driver and I stopped using them a year ago for that reason.

If you want the fastest tire out there today, get the Hoosier A6 or R6. They are low pressure tires with better stick than the Kumho 710. It is too early to tell how well the A6/R6 will wear, but you can't beat them for high traction.

Frank Gonzalez

XPC5R

Keep in mind, you have stiff springs (VBP or T1 I'm guessing) and wide wheels - they look like 11-12". Those go a long way towards supporting the contact patch and not running the tire on the shoulder.

My experience is on a stiff car (coilovers, hotchkis bars), with more camber (-3F, -2R) and 275/17 and 305/18 - 335/18 on Z06 sized wheels.

I would gather other's setup info along with their pressures, to better compare pressure requirements.

Fast_Toys

I was running Z51 suspension with BMR sway bars and 17 x 11 wheels with 315's all the way around

AUTO_X_AL

Running the lower pressures with the 315/35R17 on all four corners I was cording the inside rears and cording the outside fronts. Last weekend we went up in pressure to 46f-44r and the result was a little diffrent feel but the car was still very fast. We also ran 10 events this weekend and the tires seem to have held up alot better than previous weekends at the lower pressure. I also believe that the hoosier is a better hot tire than the 710. The hoosier works better for us being a 2 driver car as we don't seem to have to water them down where as the kuhmo seemed to get a bit greasy after a few hard runs. The 05 hoosier is a good tire and quite fast you just have to pay alot of attention to them as the durability issue is more prominant in the 05 as opposed to the 710 or the A6. Just my 2 cents.