Anybody want to share thoughts on the tire pressures they run with their V710's? I know this is subject to change given the surface and temperature, but I am looking for some help. I ran two weeks ago at 35 psi all around. It was generally neutral with no oversteer whatsoever, but there was some understeer (probably iatrogenic in nature). I was considering bumping up the pressures in the front. Does that make sense?

The theory I have read is that with less camber (I am at -1 both sides in front and -1.5 in back) more pressure is needed. I need to get the car to a race-savvy alignment shop, but that is a bit difficult to do in the middle of American Siberia.

And, if anyone wants to share their typical pressures, I would be cool with that. I know I ran much higher pressures with my Mustang, but that was a different animal all together.

Thanks.

 

With camber settings pretty close to yours, Aaron and I ran 35F/37R at Walnut Ridge Pro. That was with OTS Koni's at full-soft front, full-stiff rear.

At warmer/grippier Ft. Myers Tour, we ran higher pressures and a higher front/rear differential...we seemed to have more push issues there for some reason...bumping up rear pressures helped there (as well as softening the front shocks...we had started running the practice course there at full stiff all around)

Bryan

 

Thanks. I was thinking about softening my front shock settings as well. I might end up going up in front and back in terms of tire pressures. Back > front...

 

I am still working with my 05 RX-8, I am only on its 3rd autocross. I have similar camber settings. I started out with 42 psi/40 psi and took tire pyrometer readings after each run. I also checked how far the tire contact patch was rolling towards the side wall. After the first event I brought the pressure down to 40 psi/38 psi. The heat evened out across the tire and the tire scuffing went to the edge of the side wall. I was happy with the handling. I will be checking that when the weather gets warmer (70o to 80o vs 50o to 60o) to see if I can get better pyrometer readings when the tires retain heat longer.

 

I've found the fronts to be relatively insensitive to pressure changes running anywhere from 38-46psi. I tend to favor the higher pressures since it gives a better feel in transitions. Rear pressures are much more sensitive. I've gotten rollover at 37 and it becomes very loose above 42 indicating the contact patch is lifting off. I tyically adjust the rears first for best traction and then use front pressure for balance.

 

55/58

 

No, no, that's a typo -- it should be 65/68.

 

I used to run about 100 psi....on my 10-speed.

 

Well, that's where they thought they were setting them. We "helped" when they weren't looking. :D

 

LOL, we actually had to run the front tires that high with the BMW's back in the early Hoosier radial days

 

Lol! Only when you walk away, forgetting you are adding air to your tires.
I'm using 40/36.

 

stupid question here.....are the v710 legal in B-Stock??? I thought no R-Compunds? I am new so I don't know much about how the rules are interpreted, but this could definately impact my plans when buying new wheels/tires!

 

Yes they are. Tires for stock have to be DOT rated, (ie: No slicks) which the V710s are DOT rated.

 

Very cool! I went to the tirerack site after I posted and saw that the v710 were DOT approved....I guess the two grooves count as "measurable tread depth" satisfying the scca rules