Tire psi ?? - Kawasaki ZX-10R.net
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post #1 of 11 Old 06-29-2006, 07:52 PM Thread Starter
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Tire psi ??

I have a drag car with 33x17.5 goodyear slicks on the back. We usually put about 6.5 psi in them, but the problem is that the tire only seems to be burning on the edges from what i see in the wheel wells since there is 2 rubbed stripes on each side. So that means that I need to run more psi? right?

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post #2 of 11 Old 06-29-2006, 10:33 PM
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Are you saying that the stripes are rubbed into the actual wheelwell? If so I would think that would be a clearance issue. If when you do a burnout and the mark (on pavement) is darker on the edges than in the middle then yes you need more psi, and vice verca if it is darker in the middle than on the edges you need less. Experiment till ya get a nice uniform tire mark (or good times) .Usually works,but by no means am I a know it all dragger. Hope that helps



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post #3 of 11 Old 06-30-2006, 01:40 AM
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more psi if the outsides are laying down more

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post #4 of 11 Old 06-30-2006, 10:43 AM Thread Starter
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The tires arent rubbing the wheel wells...there are 2 stripes of rubber in the exact same spot on each well..Its an ex-pro stock car and I have a 600ci chevy motor...and all the other guys that have the same style of car are running like 5 1/2 psi..and when I tried that I just seem to be burning the tire on the outsides...So from experience would tell me that the tire is under-inflated, correct?

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post #5 of 11 Old 06-30-2006, 10:44 AM
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post #6 of 11 Old 06-30-2006, 10:52 AM
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Quote:
Originally Posted by FAF


SOunds like the sidewalls are stiffer, and theres not enough psi to hold up the middle.

If it was over inflated, it'd stretch out the middle, but not close to the edges cause the sidewall would then hold it closer to the rim, if that makes any sense at all...if not, just go with the




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post #7 of 11 Old 06-30-2006, 03:06 PM
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I used to race, too. I would say that you're underinflated. The other guys might be running a different width wheel. What you're probably doing is cupping the slick. You're slick is just wanting to grab on the outsides because there isn't enough pressure inside the tire to keep the center planted under hard acceleration. I ran a smaller tire, so it's just my .02. Do you get a lot of shake?
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post #8 of 11 Old 06-30-2006, 03:43 PM
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Quote:
Originally Posted by hillcountry10r


SOunds like the sidewalls are stiffer, and theres not enough psi to hold up the middle.

If it was over inflated, it'd stretch out the middle, but not close to the edges cause the sidewall would then hold it closer to the rim, if that makes any sense at all...if not, just go with the
:iamwithst
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post #9 of 11 Old 06-30-2006, 03:43 PM
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Quote:
Originally Posted by The Duke
Are you saying that the stripes are rubbed into the actual wheelwell? If so I would think that would be a clearance issue. If when you do a burnout and the mark (on pavement) is darker on the edges than in the middle then yes you need more psi, and vice verca if it is darker in the middle than on the edges you need less. Experiment till ya get a nice uniform tire mark (or good times) .Usually works,but by no means am I a know it all dragger. Hope that helps
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post #10 of 11 Old 06-30-2006, 06:38 PM
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