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Old 10-15-2006, 02:51 PM   #1
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Default Foams are chunking. Help!

Is there any way to put an end to foam tire chunking? I'm running a FT TC4 on a fairly tight track, some kind of ozite-like racing carpet, and Speedmind Hybrid 2 foam tires. I'm seeing a chunk lost from the outer edge of my front tires about once every two races. Is there a way to stop this? More camber? Change camber link angle? Change caster angle?
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Old 10-15-2006, 03:00 PM   #2
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glue the outside edge.
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Old 10-15-2006, 03:07 PM   #3
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drew, with what kind of glue?
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Old 10-15-2006, 03:09 PM   #4
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I personally find that gluing the sidewalls leads to more chunking. As the tires wears down, the crispy edges catch on the carpet and tear. It also seems to be unnecessary unless you're in very high-traction situations. I believe a lot of people consider gluing a tuning option, and not something that's mandatory.

Are you cutting down your tires before running them? If so, what height do you start them at? Is there any chance something is hitting the tires, like your body perhaps? Have you tried another brand of tires to see if you have the same trouble? I find Parma tires to be the most durable.
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Old 10-15-2006, 03:32 PM   #5
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the easiest way to stop chunking is to stop crashing all togther
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Old 10-15-2006, 03:34 PM   #6
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I would say glue the rear tires but you have to glue them a couple of times. The only part on the sidewall you want to glue will be where the foam meets the rim. I use the losi glue but honestly any fast drying glue will work. I also glue the tire sidewall while the tires are on the car. What I do is if have the motor not be hooked up to the drivetrain and let it free wheel. I will rotate the drivetrain and apply the glue to the edge at an even ammout to all outsides of the tires. Do this a couple times and you should be OK. Another way to help this is when cutting the foam tire, while rounding the edges round the edges with more of a radius. This should help.
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Old 10-15-2006, 03:34 PM   #7
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hey syndrome.

Yeah, I turned my tires down to 2.295-2.300" before the first race. After two races and a corner swap (one side was wearing faster than the other), they are down to 2.275-2.295". Maybe I should have rounded off the outer edge more?

My body wheel wells are cut with lots of clearance for the tires. It may be happening when I hit other cars or touch the Road Rails, though.

This is the only tire I've ever ran.
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Last edited by adamge; 10-15-2006 at 09:11 PM.
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Old 10-15-2006, 03:35 PM   #8
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Quote:
Originally Posted by adamge
Is there any way to put an end to foam tire chunking?
Run rubber
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Old 10-15-2006, 03:41 PM   #9
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dway, I've seen a few posts where people mention that their club switched to rubber on carpet. After two races, I'm starting to hope we do that, too.
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Old 10-15-2006, 03:55 PM   #10
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Ahhh... maybe you should listen to Mike Dumas... I think he knows what he is talking about
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Old 10-15-2006, 04:51 PM   #11
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I know when our local carpet track first opened the owner put down Road Rails. EVERYONE chunked tires almost every run.

Once the permanete walls went down, so did the tire problem.
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Old 10-15-2006, 05:30 PM   #12
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Try using FlexZap glue... when it drys, it remains somewhat flexible - unlike the fast-drying stuff that gets all crusty when it dries. An earlier post was correct - some racers glue the entire sidewall on their tires when traction is super-high to help prevent traction rolls.

Chunking is usually caused by your body cutting into the tire -make sure the wheel openings are cut out large enough as well so that the can pass over the tire without making contact in the event of a crash.
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Old 10-15-2006, 07:36 PM   #13
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Quote:
Originally Posted by adamge
hey syndrome.

Yeah, I turned my tires down to 2.30" before the first race. After two races and a corner swap, they are down to 2.75-2.95."

dont mean to be mean, but how could the tire get bigger after a run. for touring car, i start my tires at 57 mm, or 2.24". the tires are less likey to chunk, this is due to the fact that there is less sidewall to get pulled around by.

i dont like to superglue my sidewalls. i feel it makes my car inconsistent when it rolls up and literally slides on the superglue.

-Zac
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Old 10-15-2006, 07:59 PM   #14
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Hey adamge, I hope you are running a plaid front tire. If you need help with your tires ask rob mcquarrie from Yorkton to help you out if he comes in. I know he knows the proper gluing methods and will be more than willing to help, you can glue the old chunks back in with fabric cement purchased from Walmart. Where and when are you racing I am usually in town one week a month, actually monday and tuesday this week and I get really bored sittting in the Shark club.
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Old 10-15-2006, 10:02 PM   #15
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Z.H, thanks for pointing that out, I fixed the numbers. Despite the staggering number of foam chunks laying around the track, I did not manage to add foam to the tire while racing ;>

Cammer, I'm looking at the Parma Plaid tire, and it looks like it is a 40/55 shore tire. The Hybrid 2s I'm running are 35/55. So, same hardness on the outside. I race at the SARCAR weekly race (sarcarclub.com).

Regarding the traction compound (Jack t Gripper), does applying it to the outside of the front tires make me more likely to chunk or less likely? I was applying it to the outside both races.

-Adam
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