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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi Are my 'newer' slicks shot?Go | New | Find | Notify | Tools | Reply | |
| Are my 'newer' slicks shot? | Login/Join |
DRR Trophy |
I had been having great results with a pair of Hoosier 28 x 10.5 slicks, getting 60' times that varied by only a few thousandths from pass to pass. But alas, the cords were just starting to show through so I had to retire them and switch to my other pair of tires. My backup tires now may be spinning, as my 60' times seem to be varying by as much as 3 hundreths or so from pass to pass. The tires I have on now are Hoosier 28 x 9" skins on 10" rims. They were mounted new a year ago, have several passes on them already (last season), but have much tread depth left yet. 60' times still vary in spite of a long burnout vs. a short one. When I return to the pits the tires feel dry and debris does not stick to them. The edges of the white lettering toward the tread are a bit brown; I have heard somewhere that indicates overheating. True? The tires were stored in an unheated garage last winter and were subjected to freezing temps. I have dropped down to 14.5 PSI even. Two of the most successful racers at my track commented that my problem is that the tires are Hoosiers, and they may be 'dried out' already. One claimed that Hoosiers are only good for 50 passes! The suspension on my S10 is pretty much stock, save for the Cal-Tracs. I've gone up to 100# of ballast bolted to the inside rear of the truck box. Remarks? Thanks! Troy | ||
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| DRR S/Pro |
Are these tires different compound than the other tires? I put a set of Hoosiers off my old. At that have been sitting for three years and have gone 5.34 in 1/8 mile on them without any issues. DO5 is the softest compound Hoosier makes and that’s what these tires are, my other tires wire CO7 | |||
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DRR Pro |
The person that told you Hoosiers are only good for 50 passes is a moron! I have put well over 250 passes on mine at times and would finally buy new tires simply because the cords were showing! They were still working great on a 10.00 Foot Braked car that would see Trans Brake usage from time to time. Plenty of low 9 high 8 second passes thrown in there from time to time..... Yes, I have found when stuff is not stuck to them when you get back to your pit spot, they are done, no matter what the wear indicators show. Some people kill their sidewalls in less than 100 passes, I have never done that. Too many people do not run enough air in their tires! I run 18 to 20 psi in my 29.5x10 bias ply Hoosier slicks, no rim screws, no tubes, no problem! | |||
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| DRR Trophy |
Thank you much for your input, fellas. My worn-out but reliable 28x10.5 tires were a C07 compound; the 28x9's I'm running now are D06 compound. I just spoke with a very friendly tech at Hoosier. He told me that the compound numbers on Hoosier tires really don't have a 'logic' to them, as I wondered if different numbers indicated softer or harder compound. I had noted that the center wear indicator holes on my worn-out tires still had some depth, in spite of cords starting to peek through along the edges. The tech advised me that those holes were not a reliable indication of too little air pressure in the tires. He said too that I should not rely on looking for debris stuck to the tread when I return to the pits, though it can vary with your compound. I think I'll start to watch for it though anyway like Mike, at least with a new set of skins. The browning of the white letters on the sidewalls means nothing, he said; not an indicator of overheating. The oils in the tread rubber are desorbing, as normal. Setting in the sun will cause that too. For years I ran 13 PSI or so in my slicks, and the Hoosier tech thought that about right, though one day with 17 PSI I ran deep in the rounds in two classes. He said if that works, great! My friends seem aghast at my running that much pressure, lol. I'll have to see if I can nurse these newer slicks along to the end of the year, or otherwise switch to my drag radials and see what I can do there. I had been only running 15 PSI in those. Maybe play with the Cal-Tracs some too. Lol, I thought some about inventing some sort of tire temp gauge that would be useful during burnouts, with some sort of sensor in a wheelwell. From now on I'll buy new tires every spring whether I need them or not! Thx again, TroyThis message has been edited. Last edited by: Bad Nusz, | |||
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DRR S/Pro |
It's already available. I can put one on my data recorder if I wanted to. Curtis ____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion 2018 Div4 Goodguys Hammer award winner | |||
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| DRR S/Pro |
You don’t need new tires every spring if they ain’t wore out, keep them in the house over winter and they should be fine. Mine are 4 years old and working just fine. | |||
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| DRR Trophy |
That's interesting, Curtis; thank you. Would that data recorder have some sort of no-contact sensor then? A data recorder will be out of my budget for a while yet. I looked up some relatively inexpensive tire pyrometers, but they all seemed to require physically probing the tire. Thanks too, green1. That is awesome that you can get four seasons out of a pair of slicks. Next season I'll be able to afford to race much more and expect to make maybe 180 passes or more . I have extra rear wheels to use and can save those partly-worn tires as spares, loaners, sell them or even give them away to a young, good buddy who's on a very tight budget. With mounting and balancing, new slicks cost me a bit less than $500 a set. On a pro-rata basis I should not lose much by retiring a pair of slicks a little early. At least once per season anyway it seems I lose in the first money round, due to suspected spin. Cheers, Troy | |||
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| DRR S/Pro |
I haven’t ran the tires for four seasons they have sat for three seasons when I got my new ride out. I just put them on the new ride a couple weeks ago as my tires on it were wore out and these ones had probably 30 or less runs on them. | |||
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| DRR S/Pro |
https://www.rpmperf.com/tire-t...ck-temp-sensor..html ____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion 2018 Div4 Goodguys Hammer award winner | |||
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DRR Trophy |
13-15 is to low for this size tire and is likely killing your sidewalls. Tire could be folding over on itself bc of so much wrinkle in the sidewall and making your 60s move around(just a guess). Ive ran every 9 and 10 inch hoosier out there and lowest I have went on psi is 17.5. I currently running the new HOOSIER DBR 28x10.5 radial and run those at 19 and been as high as 22. I recommend this tire to EVERYONE out there who can fit it. Little to no burnout at all and I am getting 275+ runs out of them and still work just as good as they did when I put them on. This is on a 3400lb nova with slapper bars that I could only get 150-180 runs out of the standard bias ply slick. still had plenty of tread but sidewalls would get weak and the car would not be as consistent! | |||
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| DRR Trophy |
Ah, gotcha. ;^) That's still pretty good though that the tires still were 'fresh' after that long, with careful storage. | |||
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| DRR Pro |
Exactly! I do not know why people don't put air in their tires! All they need is video of a few launches to learn! | |||
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| DRR Trophy |
https://www.rpmperf.com/tire-t...ck-temp-sensor..html[/QUOTE] Pretty neat, Curtis; thank you. I will save that link. I see that company has a basic data recorder that only costs a few hundred bucks | |||
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| DRR Trophy |
Thank you, guys. I'll try them again with more air pressure, though perhaps the tires may still be 'dried out'. I know Mike advised me about this before, and in fact I had one of my very best days running 17 PSI in my old slicks, with a little ballast in the back. My friends were astonished at my running that high of tire pressure. I believed that my newer slicks were spinning, and in desperation I started dropping the air pressure at my last race. Here's a thing too I hadn't thought of 'till now; my 9" slicks are mounted on 10" rims. The tires are listed as fitting on 8" to 10" wheels. When I tried them at first on my 8" rims, they seemed to 'crown' the tread. So I moved them to my 10" wide rims, and in fact kindof look a little funny (Do my 10" wheels make my 9" slicks look fat?) with the tire beads way out past the tread. It occurred to me now that maybe the tire tread was 'cupping' and that I should run more air pressure. The idea of the sidewalls wearing out long before the tread is a new concept to me that I'm reading much of on this forum. At my track it seems, much like 'erectile dysfunction' no one ever talks about their sidewalls failing. And it's a cause of 60' times varying I read. I have noticed that my newer, 9" slicks of dubious viability that they have slight discolorations on the sidewalls, in the form of a 'swirl' pattern, like the fins of squirrel-cage fan. I had to wonder if that was due to normal tire buckling or wadding up. I will look into that Hoosier DBR tire; tire clearance is not an issue with that size. Thanks again! Troy | |||
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| DRR Trophy |
Sidewalls getting beat down before the tread gets burned away is definitely a thing. Had the same issue of my s10 before I got my nova. If you are on Facebook look up LUCAS WALKER. He is the man when it comes to getting any sizw slicks of any brand and can usually have them on your door in 2 days or less. I promise you will NOT be disappointed in the new HOOSIER DBR!!! Best little tire of the market right now! | |||
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Bracket Talk Bracket Talk Forum Tech Talk - by Abruzzi Are my 'newer' slicks shot?
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