Re: slicks wear pattern
 

So with this combination, 15" rim and 17" tire, 3100 lb. car, do you recommend 10-12 pounds of air pressure, or will this tend to round the tire up and put less rubber on the ground ??

Re: slicks wear pattern
 

The higher tire pressure is needed to prevent the tire from "rolling under" too low of pressure on that weight car and you run over the tire, you need to give the sidewall some help. Joe

Re: slicks wear pattern
 

What class does this car run? That is a high pressure. I know a lot of S/G guys that run these as low as 5 1/4 psi. S/STyou probably need more. If they are hooking and running consistant 60' times I would leave them alone and not worry about the tread pattern.

Re: slicks wear pattern
 

Try this: Weight / 320 = recommended tire pressure.

Re: slicks wear pattern
 

The car has run some S/ST, but for the last couple of year's been in bracket mode, run's 6.0''s in 1/8 mile, leave 3,500-4,000 rpm. Just trying to fine tune a couple of things that I wondered about. Always been a "hump" in the racepak driveshaft trace about 3 tenths out that has puzzled me. I have been told diff. causes, the tire running over itself, or could be tire spin, shocks too tight, etc. just trying to pin it down.
The formula from Indyracer would put air pressure at about 9.85 pounds.

Re: slicks wear pattern
 

Increase rear shock compression damping. What shocks are you running?

Re: slicks wear pattern
 

rear shocks are Santhuff Double adj. coil-over steel shocks. Normally set at 9 sweeps rebound, 5 clicks compression from full tight. This is a 4-link car.