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      10-01-2020, 03:03 PM   #1
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removing melted rubber from the tire

I punished my MPSS a bit more than I wanted to yesterday at the track.

This caused the inevitable melting of the groove edges and the melted rubber gluing itself back on.

I have enough tread left for at least one more summer of street driving and I would like to remove these melted bits to avoid vibrations and balance issues.

What's a good method of removing them?

Last edited by mr_lab_rat; 10-01-2020 at 05:50 PM..
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      10-01-2020, 03:50 PM   #2
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Quote:
Originally Posted by mr_lab_rat View Post
I punished my MPSS a bit more than I wanted to yesterday at the track.

This caused the inevitable melting of the groove edges and the meleted rubber gluing itself back.

I have enough tread left for at least one more summer of street driving and I would like to remove these melted bits to avoid vibrations and balance issues.

What's a good method of removing them?
burnouts. lots of burnouts.
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      10-01-2020, 04:09 PM   #3
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Burnouts. Also drive on the street for a while. They will scrub themselves off on on ramps and such.
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      10-01-2020, 05:50 PM   #4
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Quote:
Originally Posted by 5.M0NSTER View Post
Burnouts. Also drive on the street for a while. They will scrub themselves off on on ramps and such.
Cool, thanks. Upon closer inspection it looks like the stuff on them is not my own melted edges, just marbles I picked up.
The rears will take care of themselves and if the fronts don't scrub I'll mount them in the back and light them up.

Thanks. The track day was a blast. Small but technical track at Vancouver Island Motorsport Circuit.

The MPSS held up reasonably well although I probably took 12000 miles of life from them in 120 track miles
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      10-01-2020, 06:22 PM   #5
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Originally Posted by mr_lab_rat View Post
Cool, thanks. Upon closer inspection it looks like the stuff on them is not my own melted edges, just marbles I picked up.
The rears will take care of themselves and if the fronts don't scrub I'll mount them in the back and light them up.

Thanks. The track day was a blast. Small but technical track at Vancouver Island Motorsport Circuit.

The MPSS held up reasonably well although I probably took 12000 miles of life from them in 120 track miles
You are correct. It's a phenomenon I like to refer to as Other People's Rubber (OPR). It happens a lot. Here is a pic of my Cup2s after just a few laps.
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      10-01-2020, 08:54 PM   #6
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Yeah, that's what my tires looked like.

I was a bit disappointed by the PSS but when I thought about it a bit more then it made sense and maybe I expected too much.

In the morning it was quite cold, around 15 celsius. I set them at 33psi cold and they were good. With each session I felt less and less grip and heard more and more squealing.
I kept dropping pressures whenever they got over 40 I would take them down to 36 hot.

Still I wished I had more grip but I think the problem was raising track temps - it got over 25 degrees by noon. And I started going faster as I learned the track.

What hot pressures are you targeting?
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      10-02-2020, 04:39 AM   #7
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For MPSS no more than 35 hot. I target 33 to 35. I noticed they get greasy over 35 ow when over 90c.
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      10-02-2020, 08:05 AM   #8
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Quote:
Originally Posted by 5.M0NSTER View Post
For MPSS no more than 35 hot. I target 33 to 35. I noticed they get greasy over 35 ow when over 90c.
Thank you for sharing your knowledge. I did get over 35 but the temps were only about 60C. Since the sides were heating more than the centres I assumed I shouldn't drop the pressure more (both edges were slightly warmer, I got camber plates).

Since you are so helpful I'm gonna ask another question. Brake vibration after the track day. Is it the marbles on my tires or did I damage my stock brakes?
They never faded, the track is not hard on tires. My rotors got up to 300C (570F). Now when I brake lightly it's ok but when I brake harder they vibrate.

My last track day I ran the same setup and actually got the brakes to fade since it was on more demanding track. But I haven't experienced the vibrations after that one.
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      10-02-2020, 08:42 AM   #9
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Which pads did you use? If the vibration is only on light braking, than itís likely that the pads overheated and left an uneven pad deposit layer on the rotors.

Iíve had that before with Carbotech and Gloc pads. Leave the track pads in for a week or 2 of street driving. At ambient temps the pads will scrub the deposits off after some miles.
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      10-02-2020, 09:32 AM   #10
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Quote:
Originally Posted by 5.M0NSTER View Post
Which pads did you use? If the vibration is only on light braking, than itís likely that the pads overheated and left an uneven pad deposit layer on the rotors.

Iíve had that before with Carbotech and Gloc pads. Leave the track pads in for a week or 2 of street driving. At ambient temps the pads will scrub the deposits off after some miles.
Stock Textars. The vibration is only there under moderate or heavy braking. Light braking is fine.

I'm gonna swap the front wheels to find out if it's tires or brakes and also take a look at the pads.
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      10-02-2020, 06:26 PM   #11
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Quote:
Originally Posted by 5.M0NSTER View Post
Which pads did you use? If the vibration is only on light braking, than itís likely that the pads overheated and left an uneven pad deposit layer on the rotors.

Iíve had that before with Carbotech and Gloc pads. Leave the track pads in for a week or 2 of street driving. At ambient temps the pads will scrub the deposits off after some miles.
Hmm, inspected the pads and they look fine. The tires are mostly scrubbed now. Not sure where is this vibration coming from
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      10-03-2020, 07:19 AM   #12
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Look at the rotor. If you see cloudy looking spots in some areas, than this may be the culprit. You could try using some sand paper to remove uneven pad deposits.
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      10-03-2020, 10:23 PM   #13
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Quote:
Originally Posted by 5.M0NSTER View Post
Look at the rotor. If you see cloudy looking spots in some areas, than this may be the culprit. You could try using some sand paper to remove uneven pad deposits.
Will do, it feels like the brakes are getting smoother after some miles on the street.
Thanks again for helping a newb out.
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