I am having trouble with the Right Rear tire ripping chunks out on the outside edge and can't seem to figure it out. The car is really fast and winning races. There is no tire rubs and plenty of suspension travel. The right rear is getting a lot more heat than the LR but the car is not terribly loose. The tire rules are DOT street tread 205/70/15 no mud or snow tires. I have been running goodyear viva 2 that are 440 treadwear, and switched to another tire that is a 680 treadwear and it chunked out worse. I normally start my new tires on the LR and run a race or two and then rotate it in on the RR. It seems like the softer tire chunks out less. I run on a high banked 4/10th track with a dry slick clay surface. Momentum is crucial. Do I just need to find a softer tire for the dry slick track this time of year? I normally like to run 23lbs of air in the RR but I have bumped it up to 26lbs since the heat is concentrated on the outside edge. Would going up more on air pressure keep the tire from rolling under and chunking out.
Just My .02, I run UMP Hoosier E-Mod Tires and will chunk out the center tread band on the RR. I can run compounds D,A,H, D being the softest and H is like a rock. I cant run a D on anything but a heavy track or it will just ball up the tread and destroy a tire in a few laps. The A compound is the one that chunks out so Im getting away from them also. Everyone having the same problem. Everyone agrees its a problem with the Hoosier tire, not 100 differently setup cars. So Everyone is siping the crap out of the hard tire to get it to fire. I would look into a different brand and tread pattern tire for the RR and see what happens.
2012 UMP Stockcar National Champion.
2013 UMP Modified #1 Rookie National Points.
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Last race I added some weight over the Left Rear to try and tighten the car up. It didn't seem to help very much, so I think I am going to try moving the weight over on the Right Rear and try to plant the RR instead of sliding it. I have always had better luck adding weight to the RR up high rather than adding to the LR side.
mabey the outside edge is too sharp to the surface? ever try rounding it off w/a grinder while grindin tires? i have ran DOT and have had the same problem at one point but it went away after rounding off the edge of the tire, didnt notice any diff in grip either