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Below are 2 pics of my front MPSS tire. The pics are of the same tire. The outside of the tire is the right side of the pic.
The tire has 2 track weekends at mid Ohio with the recommended track alignment.
my question/issue is what could be the cause of the tire chunking in the middle?
1. Bad alignment
2. Tire overheating
3. To much street driving on the track alignment?
With the track alignment I was expecting the inner edge of the tire to wear the most.
My tires showed similar ( but less) wear after one track day with street alignment. I aired down to about 27psi cold but suspect I was still overinflated. I'm curious what others think.
My tires showed similar ( but less) wear after one track day with street alignment. I aired down to about 27psi cold but suspect I was still overinflated. I'm curious what others think.
This one doesn't look too bad. The "chunks" are actually clag from the track surface (bits of rubber from the "line" or just off of the line"). What were your track tire pressures? Also, what type of alignment were you running?
OP's tires is showing some weird wear pattern. Wonder if it was over inflation? What tire pressures are you running cold and hot?
This one doesn't look too bad. The "chunks" are actually clag from the track surface (bits of rubber from the "line" or just off of the line"). What were your track tire pressures? Also, what type of alignment were you running?
OP's tires is showing some weird wear pattern. Wonder if it was over inflation? What tire pressures are you running cold and hot?
I have yet to track the Z06 (but plan to).
my tire pressures cold are 27-28 all around. Hot, they are 32-34.
Below are 2 pics of my front MPSS tire. The pics are of the same tire. The outside of the tire is the right side of the pic.
The tire has 2 track weekends at mid Ohio with the recommended track alignment.
my question/issue is what could be the cause of the tire chunking in the middle?
1. Bad alignment
2. Tire overheating
3. To much street driving on the track alignment?
With the track alignment I was expecting the inner edge of the tire to wear the most.
What did you have as a track alignment? The Owner's Manual recommended track alignment? Or something else? Owner's Manual and Spring Mountain recommend 26 psi cold pressure for running on track.
It is hard to tell how much chunking (if any) is present with the rubber pickup on the tread. I don't think it is too bad but you may have worn the center of the tire a little more than you should have. How much understeer were you experiencing?
Take the car for a highway drive where you can run at a constant 70 mph for about 10 miles in one direction and see if that will get the rubber hot enough to come off the tread. If you can get it off then measure tread depths across the tire to see where it is worn.
Below are 2 pics of my front MPSS tire. The pics are of the same tire. The outside of the tire is the right side of the pic.
The tire has 2 track weekends at mid Ohio with the recommended track alignment.
my question/issue is what could be the cause of the tire chunking in the middle?
1. Bad alignment
2. Tire overheating
3. To much street driving on the track alignment?
With the track alignment I was expecting the inner edge of the tire to wear the most.
This looks like a good alignment but over inflated tire plus over steering with too much speed in the corners.
(driving past the optimal slip angle of the tire) which over heats the tire.
You have 4 options in the corners.
1. use less steering input. (drive on the lower or /optimal slip angle of the tire)
2. slower the speed with the same steering input.
3. find another line that also requires less steering input.
4. lower tire pressure and see how it works out.
Here is my tire (MPSS) with not enough camber / over inflated / driving past the optimal slip angle. Worn on the outside of the tire.
Last edited by cagotzmann; 09-08-2017 at 12:14 AM.
I think you'd need to get a torch and putty knife to scrape a good section of the crap off before you could get a good assessment of what's going on with the tire.
This looks like a good alignment but over inflated tire plus over steering with too much speed in the corners.
(driving past the optimal slip angle of the tire) which over heats the tire.
You have 4 options in the corners.
1. use less steering input. (drive on the lower or /optimal slip angle of the tire)
2. slower the speed with the same steering input.
3. find another line that also requires less steering input.
4. lower tire pressure and see how it works out.
Here is my tire (MPSS) with not enough camber / over inflated / driving past the optimal slip angle. Worn on the outside of the tire.
Listen to Bill......
I don't think putting a torch on your tires is a good idea.... sorry
Heat gun set on low would be the most I'd try..... but even that is a last resort idea....
Go drive and see what peels off....
The pic in my original post was after driving 65 miles home from the track on the freeway at 70mph.....if anyone is curious or if it makes a difference, the track was mid Ohio and the tire is the driver side front.
i will try lowering the cold pressure to 26psi.
the track alignment is the owner manual recommended alignment. My cold pressure may have been to high as I was at 27 to 28psi
however, I didn't experience any understeer.
Last edited by Bigg Slimm; 09-08-2017 at 08:13 AM.
The pic in my original post was after driving 65 miles home from the track on the freeway at 70mph.....if anyone is curious or if it makes a difference, the track was mid Ohio and the tire is the driver side front.
i will try lowering the cold pressure to 26psi.
the track alignment is the owner manual recommended alignment. My cold pressure may have been to high as I was at 27 to 28psi
however, I didn't experience any understeer.
understeer is always difficult to feel until you hit the extreme end.
Eg. if the perfect slip angle of the tire is 4 degree's.
Lets say you need a 30 degree steering wheel input to make the turn at full speed with perfect 4 degree slip angle.
You have 2 other options to make the same turn but at a slower speed than perfect.
1 drive the corner with only 2 degree slip angle
2 drive the corner at 6 degree slip angle
in both cases the car will drive on the same radius make the corner at the same speed, feel like the same grip to you, but in case 2 the tires overheat and in case 1 the tires have normal and less wear.
The easiest why I find I can determine which side of the slip angle I am driving at is let off the throttle a bit, if the car turns much better you are on case # 2, if nothing happens to the turn radius you are driving with case 1.
or add throttle if the car pushes more then you are already past the perfect slip angle (over heating the tire). If they car maintains the radius then you are under the perfect slip angle of the tire.
09-05-2017, 09:05 AM
MPSS Tire issue/question
