slicks wear pattern - Page 2

68camaroSS · 10-16-2009, 06:34 AM

Quote:

Originally Posted by Keith 944

thanks for the post, that makes sense, i have seen this on almost every tire i have run, all sizes, brands, and pressure.

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 ??

buzzinhalfdozen · 10-16-2009, 07:21 AM

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

tiremaster · 10-17-2009, 08:13 PM

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.

JMatt · 10-17-2009, 09:54 PM

Try this: Weight / 320 = recommended tire pressure.

68camaroSS · 10-18-2009, 06:03 AM

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.

JMatt · 10-18-2009, 06:45 AM

Quote:

Originally Posted by 68camaroSS

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.

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

68camaroSS · 10-18-2009, 09:47 AM

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.

10-16-2009, 07:21 AM	#12
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 985 Likes: 0 Liked 12 Times in 9 Posts	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 __________________ Joe Buchanan SS/BX 3117

10-17-2009, 08:13 PM	#13
tiremaster Junior Member Join Date: Oct 2009 Posts: 36 Likes: 0 Liked 8 Times in 4 Posts	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.

10-17-2009, 09:54 PM	#14
JMatt Junior Member Join Date: Sep 2009 Posts: 87 Likes: 0 Liked 0 Times in 0 Posts	Re: slicks wear pattern Try this: Weight / 320 = recommended tire pressure.

10-18-2009, 06:03 AM	#15
68camaroSS Junior Member Join Date: Aug 2008 Location: columbia TN Posts: 88 Likes: 0 Liked 0 Times in 0 Posts	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. Last edited by 68camaroSS; 10-18-2009 at 06:10 AM.

10-18-2009, 09:47 AM	#17
68camaroSS Junior Member Join Date: Aug 2008 Location: columbia TN Posts: 88 Likes: 0 Liked 0 Times in 0 Posts	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. Last edited by 68camaroSS; 10-18-2009 at 10:30 AM.