Your were running them 30-32 hot?

 

Cold starting pressures & let them creep, cooling w/ water between runs.

 

very high

 

Were those A6's? You need R6's for the road course...

NM-you were running autox, right?

I went through 2 sets of 285/30-18 V710's this season. Not cheap.

 

Not really. They were A6's on an autocross course with stock style struts. Only 2 degrees - camber up front. I should have run higher pressures than that considering the conditions.

 

Take my word for it-45lbs is too high, especially on stock suspension.

 

One thing to consider is the length and content of your runs. We get probably 50-60 or so good runs on a set of Hoosier A6's, but many of our local events are 30-45 second courses with many transitions and few long high speed sweepers. If you are running on a road course you will probably have more high speed sweepers that will eat the edges up real fast.

The Kumho V710 usually lasts about 50-60% more runs than the A6. You description of the two is right on. The Hoosier has more overall grip, but does not like much slip angle. The Kumho likes more slip angle and gives more feedback of what the car is doing. . .

EVOlutionary

 

45 lbs is a little high for the stock suspension. I was running 38 all around on the stock suspension. I got 50 runs out of the tires, and about 25 of them were on a lot we call "The Cheesegrater."

The A6's are suprisingly indifferent to pressure. At Nationals last year there were people running as low as 24 lbs and as high as 42 lbs in the A-stock Solstices.

 

You need a LOT more camber...like -3.5 to -4.0 to make those tires last longer. 40-43PSI hot according to Hoosier. I'll be testing a set at Road Atlanta this weekend.

Cleve

 

i'm gonna have to go ahead and disagree with you there.

on the stock suspension i would be shooting for the 45psi range on the front to help with the poor geometry. even with good alignment i'd be at or above 38psi on the front.

I'm not sure i'd say the a6's are indifferent to pressure settings. a couple psi can really change the balance of the car and 10 psi can cut the life of the tire in half.

 

I'm just saying, there were people running a huge range last year on that particular car. According to Hoosier, the A6's can handle lower pressure than previous versions of their DOT R.

 

I understand, but i would be very hesitant to take tire pressures run on a solstice and run them on an evo. there is very little similar between the the two cars.

 

Back on Kuhmos & prefer them. They telegraph so much better & I like a bit of slip-angle, as it suits my driving style better.

I'm sure ultimate grip is given up, but I believe I'm slightly quicker w/ the 710s for the above reasons...

And, I KNOW they last longer

BTW, I can run 33-34fr & 31-32rr (cold) w/ no adverse wear on them.

 

Yep, that sounds like a good place to be for pressures on the Kumhos. The Hoosier A6's need a little higher. The Hoosier A5's and A4's need ALOT higher . . .

As far as what's faster, datalogging has showed us that the Hoosier A6 is about 1/2 second faster on a 50 second course, even though it FEELS slower. . .

That is on our particular setup. YMMV. . .