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YOUR RESEARCHTire chunking
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fastest i have driven the car
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Suspected cause · Original poster
This is probably the fastest I have driven the car , but it has never done this before (after many, many track events).
Leading evidence: 'fastest i have driven the car' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'fastest i have driven the car' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Clean tire chunks off of it' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
I'll get that back to you after I clean your tire chunks off of it.
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Suggestion · Original poster
I noticed the rubber really started coming off in chunks or strands, after every run session.
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Suggestion
it sounds like you're near the end for that set due to compounding issues.
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My Pilot Sports have about 25% tread left when I tracked it last weekend. I noticed the rubber really started coming off in chunks or strands, after every run session. This is probably the fastest I have driven the car , but it has never done this before (after many, many track events). Stick was excellent, so I can't figure it out. I wonder if it gets down to a certain level the compound changes and now I will see accelerated wear. Any thoughts?
I was hoping to avoid new tires until the PS2s come out in my size.
I'm not an expert on tires by any means, but I've learned a bunch of things since starting kart racing.
In the karting world many guys will tell you that the faster you drive the tires will wear exponentially (spelling?) more. For example if you're cutting laps at my local kart track at 42 seconds (respectible) you would have a certain level and rate of wear. A 41 second lap would wear twice as fast as the 42 second lap. A 40 second lap would wear 4 times as fast as the 42 second lap and so on.
Also every time you "heat cycle" a tire the compound gets slightly harder. A cycle being defined as going from cold to hot and back to cold again.
Again I'm not sure how scientific the first part is and how much of it applies to car tires, but I thought I would mention it since you're tracking your car.
i 2nd lance's observations. rubber vulcanization occurs after rapid heat cycling, like repeated runs and then extended cool downs. i'd say that's what you're experiencing. it's happened to me many times (other cars, tires, etc.). and it's more common after you're past the 50% wear mark or so. i always fear my tires 'going off' and getting greasy, it usually spells a shorten lifespan thereafter.
I've heard the Pilot Sport Cups get real hard after several heat cycles. It lasts longer than Hoosiers, but the compound loses it's grip and hardens as it gets older. Maybe this also makes it chunk more? Don't know if this relates to the Pilot Sports as this is what I've heard about the Pilot Sport Cups.
I heard the oppsite about MPSC. The MPSC maintain a consistent grip level regarless of heat cycle.
I am trying the MPSC this season and will find out for real.
Multiple heat cycles, "lots" of miles, and now you're pushing the tires harder than ever... it sounds like you're near the end for that set due to compounding issues. My Rossos and S-03s never chunked.
Oh well, time for some Cups!
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