#1
Posted 06-05-2012 11:51 AM
Assumptions:
1) we're running within the top 3 as far as fast lap times. I think some of the newer/slower cars may see very different data.
2) we're rotating, but not pre-heat cycling the tires, as recommended by Hoosier
3) starting pressures 28-29 depending on corner and air temp, ending pressure 36
4) car weight 2350
Race 1 - 2nd heat cycle. Low tire wear track. Tires perform consistently, very grippy and fast
Race 2 - 4th heat cycle. Low tire wear track. Tires as good as previous race...no fall off. Fast lap late in the race
Race 3 - 1st heat cycle. High wear track. One tire is pretty much shot.
Race 4 - 3rd heat cycle. High wear track. All tires ruined and did not grip through the whole race.
I don't see any way to run a tire in a race passed the fourth heat cycle, and only then if air temperatures and the track pavement cooperate.
When the grip on the Hoosiers is good, its actually great. One cycle too many and they seem to be junk.
Are these observations consistent with others turning relatively fast laps? Is it worth heat cycling before using? I know many of the first place finishes are coming on fresh-out-of-the-box tires.
This isn't a budget question...just an absolute speed question from someone that needs all the help he can get to run up front.
#2
Posted 06-05-2012 12:20 PM
This isn't a budget question...just an absolute speed question from someone that needs all the help he can get to run up front.
Jim Drago says buy a '99.
- Kevin Anderson likes this
Blake Clements
http://www.blakeclements.com - Driver Coaching, Consulting, & Video/Data Analysis.
OPM Autosports/SP Induction Systems/X-Factor Racing/G-Loc Brakes/Traqmate/Bell Helmets
#3
Posted 06-05-2012 12:27 PM
#4
Posted 06-05-2012 12:40 PM
They definitely last the longest when you follow Hoosiers recommendations on breaking in. If you have the ability.. It is best to run and sit for a week. What I have been "trying' to do, is qualify on Stickers as I have a mental block scrubbing sticker Hoosiers in a practice session. Get off of them in 4-6 laps and let sit. Let sit a week if you can, 24 hours or more or in worst case.
Or you can always just Buy a 99 as Blake says..
- Alex Bolanos likes this
East Street Auto Parts
Jim@Eaststreet.com
800 700 9080
#5
Posted 06-05-2012 12:57 PM
It can be done however, last year I corded a Hoosier at VIR and it was so bad that it started to wobble going down the track the steel cords were busting and the tire was getting lumpy.I have yet to wear out a Hoosier,
I can't tell you how many heat cycles I had on them but it was a bunch. went into the brake zone going into turn one pretty hot and it just started smoking and coming apart.
the point is unlike the Toyo which you can safley run down to the bone, when the Hoosier goes bald, if you dare drive it to that point its a weapon, against you.
Frank
TnT Racing
SCCA Ohio Valley Region
#6
Posted 06-07-2012 03:31 PM
So, is 36 a good hot pressure? I thought Hoosier said 38-40.
--because someone commented that we should all post our names, and not be anonymous. I agree.
#7
Posted 06-07-2012 03:58 PM
Leaving a set on my car and not rotating them....running them as "heat cycled" by Phils Tire Service, I corded a front left on my car in about five hours of track time at an open track event.
I still haven't figured them out. Burning up the last of my toyos and toyo bucks from last year, then giving them another try. They are most certainly easier to drive than the toyos......so maybe I'm not pushing hard enough.
Vick
www.volko.com
Black SM/SM2/"Slap Bracelet Throwback" #12 in the Northeast....if the car was made in the early 90's it should look like it.
1.6L forever! Bring on your '99's and '01's!
#8
Posted 06-07-2012 04:10 PM
As for heat cycling them in practice, I gave that up. It seems silly to waste the best heat cycle when they really are only grippy for 4-6 cycles anyway. I like Drago's idea of using them for qualifying then letting them sit.
They do seem to work best when you throw a set of stickers on before a race, but it tends to accelerate the wear/fall off so that they only last 3-4 heat cycles before falling off.
- Alex Bolanos and Keith Andrews like this
Bruce Andersen
Senson Racing Group
#9
Posted 06-21-2012 07:58 PM
Pardon my sloppy driving.
#10
Posted 06-21-2012 08:29 PM
#11
Posted 06-21-2012 09:58 PM
Jim
East Street Auto Parts
Jim@Eaststreet.com
800 700 9080
#12
Posted 06-22-2012 04:57 AM
Vick
www.volko.com
Black SM/SM2/"Slap Bracelet Throwback" #12 in the Northeast....if the car was made in the early 90's it should look like it.
1.6L forever! Bring on your '99's and '01's!
#13
Posted 06-22-2012 11:49 AM
#14
Posted 06-22-2012 02:41 PM
This passed week at road America I raced on 6 session tires. They never fell off, last three laps were great. I race homestead on 9 session Hoosiers. You do have to change the car for the loss of grip as you go. But never corded one.
Todd, you forgot to finish your comment.
"You do have to change the car for the loss of grip as you go."
You forgot to say how to change the car. Some choices might be:
1. Add more negative camber
2. Soften sway bars
3. Adjust tire pressure
4. I have no clue, ask my crew chief
#15
Posted 06-22-2012 02:46 PM
Todd, you forgot to finish your comment.
"You do have to change the car for the loss of grip as you go."
You forgot to say how to change the car. Some choices might be:
1. Add more negative camber
2. Soften sway bars
3. Adjust tire pressure
4. I have no clue, ask my crew chief
We just let Todd drive.. The rule is no wrenches or tools for Todd
East Street Auto Parts
Jim@Eaststreet.com
800 700 9080
#16
Posted 06-24-2012 08:33 PM
--because someone commented that we should all post our names, and not be anonymous. I agree.
#17
Posted 06-24-2012 08:45 PM
So, is 13 sessions too much? Are they supposed to be so slippery? I just hate throwing away tires when it looks like there's still tons of rubber left on them. Grrr....
I am finding that in most conditions, 5 or 6 sessions is too much.
#18
Posted 06-25-2012 07:56 AM
So, is 13 sessions too much? Are they supposed to be so slippery? I just hate throwing away tires when it looks like there's still tons of rubber left on them. Grrr....
Depends on your goal. Can you drive on them, sure as long as you got rubber. Will the tires be competative? No.
James York
sponsored by:
Stan's Auto Center, Lafayette LA
powered by:
East Street Racing, Memphis TN
2003 Spec Miata
#03
#19
Posted 06-25-2012 08:57 AM
East Street Auto Parts
Jim@Eaststreet.com
800 700 9080
#20
Posted 06-25-2012 09:26 AM
It also depends on track... Some tracks need newer tires than other. Sandlns pole lap was set on 8 session Hoosiers and Buras ran on Steyns take off Hoosiers at Road America with roughly the same amount of heat cycles.. I was the sissy in the bunch opting for newer tires, just in case
!.6 secret?? As they get older the lack of corner grip is compensated by better straight away speed? Anyone have data that actually shows this...or not? Just a thought....
Ron
RAmotorsports
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