I have a set of Yok A032s that have seen 10 days at the track. They are still gripping well but are down to and through the wear bars. The wear is even with maybe a bit more in the center. Not very much tread to be found in the center. How much farther until I get to the cords ? I would like to run them for 2 more days.
Also, I seem to be getting the best grip starting with 34 psi cold. All 4 corners get to about 40 psi hot. I have tried higher cold temp
(by cold, I mean the night before after sitting a long time) and they go up about the same amount but feel greasier. I have not tried starting
them lower. The car is a 944 S2 with coil overs, the rest is stock. Any advice on the pressures ? Certainly the even hot pressure at all 4 corners is a good thing I would think. Thanks, Nate

 

Be careful! I saw a guy in same situation at Thunderhill and he quit when he saw the cords. However, he did not make it home and had to use his temp spare.

 

Nate,

I started with 34psi warm (measured the pressure when I arived to the track after driving 1 hour) and ended up at 39psi at all 4 corners. It seemed to match what you indicated and the car seemed to stick pretty well.

 

Oops, my car is a 930 so you may want to disregard my above post.

 

Nate,

I'm running 235/17 and 255/17 A032's on 17x7 and 17x9 wheels on my 944-S. I run 30 PSI all the way around and see hot temperatures on of around 36-38 on 100+ degree days at Watkins Glen.

The car sticks great at these temps...very neutral handling with easy drifting. Got about 10 days on the tires and 3-4k street miles before cord was visible in small cuts in treads.

However, the S has less power and weight (188 HP when new) than your turbo S, so the higher pressures may be appropriate for you.

Cord is currently starting to show on the shoulders, and the tires are being replaced with Toyo RA-1's.

FWIW, my lap times are in the 2:33's with the original shocks/struts etc. from 1987.

Matt