yellowss7 Posted May 10, 2011 Share Posted May 10, 2011 Anyone care to share their knowledge on Heat Cycles? Specifically, how many heat cycles can I expect a set of Hoosier bias ply Slicks to last before they significantly lose their stick? I did another track day on Saturday and found myself not able to keep up with a few cars I thought I should be able to out perform in the turns. As you would suspect, I have plenty of rubber remaining, but I remember from my autoxing days that the tires definately lost their grip even though there was plenty of rubber left. Tom Link to comment Share on other sites More sharing options...
Ian7 Posted May 10, 2011 Share Posted May 10, 2011 Hi Tom, tread remaining is almost valueless in determining the health of a bias race slick. The number of cycles you get will depend a lot on car weight (not too much in this case), and how you drive. Did you wail on them from the second corner, or build up to temperature over a few laps? Did they cool completely before you wailed on them again? If abused, they'll be (relatively) slow after as few as three cycles. FFord and F2000 guys are on Hoosier radial slicks and getting 6 cycles without a significant drop off. Of course, each guys measure of significant depends on where in the pack he expects to be LOL. And just to note, and I'm sure everyone here knows this, one heat cycle per season does not mean your tires are good for three years :-) Link to comment Share on other sites More sharing options...
yellowss7 Posted May 10, 2011 Author Share Posted May 10, 2011 I am just doing Track days, not racing, so I am definately not thrashing the crap out of them, and I usually take it easy the first lap or two just to get some heat in them. They do cool off between sessions as it is usually an hour or more between sessions. I figure that I have about 32-36 heat cycles in this set. I guess I might be pushing their life cycle a bit eh? They still get sticky enough to pick up every stone and pebble on the paddock after a run though. :cuss: I have another day scheduled for May 17th, that I will give them another go before I call them toast. I Might just have to have a new set before I meet up with Croc, Karl and Mike in June. :seeya: Tom Link to comment Share on other sites More sharing options...
Boxologist Posted May 10, 2011 Share Posted May 10, 2011 maybe I should scrub them in for @ Dover in early June for you? Link to comment Share on other sites More sharing options...
yellowss7 Posted May 10, 2011 Author Share Posted May 10, 2011 Thanks Jon. I have potentially 4 more trackdays in June before the 27th,28th get together, so I should be able to get a session on them before the get together. Hope you will figure a way to tow yours down for the event. You know it's going to be a blast. Tom Link to comment Share on other sites More sharing options...
Kitcat Posted May 10, 2011 Share Posted May 10, 2011 As I recall from my auto-X days, 6 events (heat cycles) was max on Hoosiers. And all the serious guys ran on tires w/just 1 heat cycle at Nationals. Link to comment Share on other sites More sharing options...
dallasdude Posted May 10, 2011 Share Posted May 10, 2011 32 heat cycles is forever on bias slicks. I think for most people 6-10 cycles is normal for club racers in production car. As someone said ...it's a combination of heat cycles and age. The way they are kept affects the aging also. Bagging them in a cool place (not freezing)helps. In a hot trailer might be the the worst way. Hoosier is coming out with a new 13" radial slick. They had hoped to have it out by Memorial day. I looked at the specs...and put one of the test batch side by side with one of my bias slicks. They are taller than the Goodyear slicks and quite a bit taller then the Hoosier bias slicks. They will need lots of negative camber. Hoosier has the specs on both radial 13" size slicks posted. The person who worked with Hoosier testing the 13" radials and ran the 15's at the runoffs last year thought they were consistent through a 30 minute race and would go more heat cycles before they dropped off a lot. The are also more expensive, so the end cost may be similar, even given the extended life. Link to comment Share on other sites More sharing options...
yellowss7 Posted May 10, 2011 Author Share Posted May 10, 2011 Thanks Mike, I'm assuming that each 25 minute session is a heat cycle, so if I do 4 or 5 sessions a day then that's 4 or 5 heat cycle per trackday. Obvioulsy I'm getting my money's worth and since it's not race, I don't have to worry about getting the max performance out of them. But on Saturday i did think that they may have lost some of their performance as I did have trouble keeping up with some cars that I should have no problem staying with. It is possible that they were a lot better drivers than me, though. I think I've done 8 track days with this set so far. Tom Link to comment Share on other sites More sharing options...
TheDingo8MyBaby Posted May 10, 2011 Share Posted May 10, 2011 As much as I hate suggesting it, you may be able to use tire treatments. If you're not racing competitively, there are tire treatments than can revive tires, but they're banned in almost all forms of racing and can be pretty nasty to work with. You also may want to check with your local track as some tracks do not allow the use of tire treatments on their racing surface. Link to comment Share on other sites More sharing options...
James A Posted May 10, 2011 Share Posted May 10, 2011 32 - 36 heat cycles!?!? I've never heard of a Hoosier slick having so many cycles. We get 4 - 6, 30 minutes sessions on the bias slicks we run in SCCA and the rubber is gone so we never approach the point where they cycle out. What compound are you running? I can only guess you have gone beyond their design life. There is an engineer at Hoosier who is very very helpful named Jeff Speer here: he has been most helpful with my questions. Mike you coming down to TWS and running in two weeks? Jim Link to comment Share on other sites More sharing options...
Boxologist Posted May 10, 2011 Share Posted May 10, 2011 (edited) Thanks Jon. I have potentially 4 more trackdays in June before the 27th,28th get together, so I should be able to get a session on them before the get together. Hope you will figure a way to tow yours down for the event. You know it's going to be a blast. Tom co-driver found w/ tow rig. so i'm covered for the NT and NEDviv. My ass will be handed to me.:driving: Build some tyre warmers to minimize the heat cycles between run groups. Edited May 10, 2011 by Boxologist Link to comment Share on other sites More sharing options...
yellowss7 Posted May 10, 2011 Author Share Posted May 10, 2011 32 - 36 heat cycles!?!? I've never heard of a Hoosier slick having so many cycles. We get 4 - 6, 30 minutes sessions on the bias slicks we run in SCCA and the rubber is gone so we never approach the point where they cycle out. What compound are you running? Jim, I'm running R25, the softest compound on the Hoosiers. Figure 8-9 track days, minumum 4 runs of 25 minutes each. Are you running a 7 James or a heavier car? So from the tone of this discussion they are probably shot?:rofl: Tom Link to comment Share on other sites More sharing options...
yellowss7 Posted May 10, 2011 Author Share Posted May 10, 2011 Jon, the important question is "will your codriver let you use his tow rig to bring "Snakebit" to NJMP for our June trackday event"? Tom Link to comment Share on other sites More sharing options...
James A Posted May 10, 2011 Share Posted May 10, 2011 We are running an E Production Caterham 7 in SCCA, the legal weight with driver is 1460 pounds and we are on bias ply slicks with the R45B compound. We get a double weekend race on the tires plus maybe another 30 minutes to an hour of testing before they give up completely. I'm amazed your slicks are still sticking so well with that many heat cycles! You definitely got your monies worth. Link to comment Share on other sites More sharing options...
dallasdude Posted May 10, 2011 Share Posted May 10, 2011 Jim, I should be able to make TWS. I have to resolve the oil control problem I had at TMS...and the broken clutch disk. Part of the new car development I guess. After all I said about old tires....I did run several laps last weekend on 5 year old tires with probably a dozen heat cycles. They came off the car you have now. They were a gift from Larry. Probably shouldn't have trusted them on a high speed track like this. Unfortunately I wasn't any faster on new ones. Sorry to hijack. You'd think we have telephones in Texas. [/url] Link to comment Share on other sites More sharing options...
Boxologist Posted May 10, 2011 Share Posted May 10, 2011 Jon, the important question is "will your codriver let you use his tow rig to bring "Snakebit" to NJMP for our June trackday event"? Tom better question is will my co-driver let me beat him. My question is the little old lady who can't see over the dashboard in her Miata gonna show. I need to claim my revenge! Link to comment Share on other sites More sharing options...
SkinnyG Posted May 10, 2011 Share Posted May 10, 2011 My co-driver and I ran a set of Goodyear slicks from brand new for 3 autocross events before they felt like they were going off. Worked out to something like 15 minutes of runs. I continued to run them for two full seasons. I'm currently running used Hoosiers that I soak in a mix of 50% Xylene and 50% Toluene. I already have my kids, so I'm not worried about birth defects. Link to comment Share on other sites More sharing options...
Kitcat Posted May 11, 2011 Share Posted May 11, 2011 A downside of super sticky slicks can be oil starvation in some corners. My stock X-flow w/non-baffled oil pan is particularly vulnerable. Dry-sump systems have no issues. Don't know what's in between the 2, I guess my system w/ baffles? Or an Accu-sump system? Link to comment Share on other sites More sharing options...
James A Posted May 11, 2011 Share Posted May 11, 2011 Your right, in between is a heavily baffled sump and an Accusump, without the Accusump the race car engines only last a few events. Link to comment Share on other sites More sharing options...
dallasdude Posted May 15, 2011 Share Posted May 15, 2011 New Hoosier radial slicks http://www.hoosiertire.com/pdfs/radial43542_bull.pdf Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now