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Possible to use patched/plugged tires at a HPDE and AutoX???

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Possible to use patched/plugged tires at a HPDE and AutoX???

Old 01-12-04, 06:33 PM
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Possible to use patched/plugged tires at a HPDE and AutoX???

I picked up some (4) Pirelli P4000s and 2 of them have had a hole plugged (heard plugging is different from patching?).

The original size of the hole is about the size of a BB (BB as in pellets for BB guns).

The hole has been plugged but I'm wondering if there will be any problems if I use them on a 2 mile track and at autocrosses.


I am a novice driver (read: 1 school, 1 open lap day). Assuming that high speed braking causes significant stress/load on tires, the highest speed that I have braked from is ~110mph and I don't think I will be braking from much higher speeds.

Do you think these will be able to stand a driving school and a few autocrosses? As long as they don't blow up or depressurize suddenly mid-turn...

Here is a picture of the plugged up puncture (match for size comparison)


Here is a picture of the plugging on the inside of the tire.
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Old 01-12-04, 06:49 PM
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I wouldn't do it. Especially considering the fact those are touring type tires -- hardly ideal for performance.
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Old 01-12-04, 06:56 PM
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Should be okay for autocross.
Heck, we even used plugged tires for drifting event. and it was in the rear too.
I think plug is better than patching. It should not come out.
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Old 01-12-04, 08:38 PM
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Autox would be just fine but for a high speed lapping event I would err on the side of being anally cautious and not use them. Having things go wrong at high speeds should be avoided whenever possible.
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Old 01-12-04, 09:24 PM
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http://www.nasaproracing.com/hpde/preparing.html

WHEELS & TIRES The wheels should be round without any dents or damage to the mounting surface. The tires should be in good condition. The tread should be above the wear bars. No cords or belts should show. Flat tires repaired with plugs should not be used as these could fail under the high stress of track conditions. Hubcaps or beauty rings should be removed. They can come off causing a dangerous situation for you & other students.

I strongly advise against using those tires for high speed track events. I wouldn't worry too much about autocross though. Autocross isn't anywhere near as harsh on tires (or anything for that matter) as road course events. Also, the speeds aren't as critical.
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Old 01-13-04, 07:06 AM
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Damon should get a "top 5 quotes of the year" award for that one...

Cory
has used plugged tires for autocross.
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Old 01-13-04, 07:24 AM
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Originally posted by Cwaters
Damon should get a "top 5 quotes of the year" award for that one...
Thanks. I try to force myself (no matter the expense) to keep things like tires, brakes and suspension in perfect order. Don't ever let a problem happen if you can prevent it. Too many times I see people go drive anyway with a known issue they have not fixed. I know I sound like somebody's Dad but it only takes one time to hurt yourself; don't give it a chance.
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Old 01-13-04, 06:38 PM
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thanks guys!
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Old 01-13-04, 08:37 PM
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Wow...

You know, I always bitch and complain about having to get to tech in the morning, but then I come across something like this, and I remember why they have tech!

That said, it is truly unfortunate that you would probably make it past tech with those tires at most of the events I have attended...
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Old 01-13-04, 10:08 PM
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on one side: i have seen guys race on slicks that were plugged, no prob. cover it with some rubber cement to be sure. give it a day or two to cure. i have seen a tire dealer do this on his race car!! i have driven on one tire that's been patched. 195/50/vr15 sumitomo htrz. drove willow and sears several times.

on the other hand: i don't think i'd do it again. i'd certainly switch the plugger to a spare, and buy a new tire (or 2?)
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