Tire build up & pulsating at track problem

muddtt · 10-12-2015, 01:09 PM

So I went to my first track day. Was using my street tires (Mich pilot sport a/s3). On my last lap of the day on a large sweeping left turn it felt like my front passenger tire was pulsing. Almost felt like the tire wall was collapsing or something was wrong with the tire. I slowed down the rest of the way to the pit and noticed it more turning left than right. Upon stopping in the pits I did a visual inspection and didn't notice anything significant.

On my 3 hour drive home nothing felt that out of sorts.

Next day I lifted the car to check the suspension components and everything seemed tight. Tires looked okay except for this rubber build up in the photo below. There was much more on the passenger side than the drivers side. Anyone ever experience this? and is it probably the cause of the pulsating on turns?

Also, any suggestions on how to get it all off without spending hours scraping at it?

Kgolf31 · 10-12-2015, 01:26 PM

OPR - Other People's Rubber.

You went off-line somehow and a hot tire will pick this stuff up.

Go somewhere wet (like parking lot) and do circles in both directions to the point where tires start to skid. It'll come right off

Ginger_Extract · 10-12-2015, 03:09 PM

Yeah, it's just tire crud. If it builds up really badly, it'll create a mild shake/vibration. It'll wear off by itself just driving around.

tuj · 10-12-2015, 04:01 PM

we call them 'marbles' or 'clag'.

10-12-2015, 01:09 PM	#1
muddtt Second Lieutenant 108 Rep 213 Posts Drives: BMW 135i (E88) Join Date: Jun 2014 Location: san, jose, ca, USA iTrader: (0)	Tire build up & pulsating at track problem So I went to my first track day. Was using my street tires (Mich pilot sport a/s3). On my last lap of the day on a large sweeping left turn it felt like my front passenger tire was pulsing. Almost felt like the tire wall was collapsing or something was wrong with the tire. I slowed down the rest of the way to the pit and noticed it more turning left than right. Upon stopping in the pits I did a visual inspection and didn't notice anything significant. On my 3 hour drive home nothing felt that out of sorts. Next day I lifted the car to check the suspension components and everything seemed tight. Tires looked okay except for this rubber build up in the photo below. There was much more on the passenger side than the drivers side. Anyone ever experience this? and is it probably the cause of the pulsating on turns? Also, any suggestions on how to get it all off without spending hours scraping at it?
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10-12-2015, 01:26 PM	#2
Kgolf31 Brigadier General 459 Rep 4,531 Posts Drives: 2007 Z4MC, 2012 128i Join Date: Sep 2008 Location: Ohio iTrader: (4)	OPR - Other People's Rubber. You went off-line somehow and a hot tire will pick this stuff up. Go somewhere wet (like parking lot) and do circles in both directions to the point where tires start to skid. It'll come right off
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10-12-2015, 03:09 PM	#3
Ginger_Extract California-bound 385 Rep 1,480 Posts Drives: BMW 135i Join Date: Jan 2013 Location: Los Angeles, CA iTrader: (3)	Yeah, it's just tire crud. If it builds up really badly, it'll create a mild shake/vibration. It'll wear off by itself just driving around. __________________ Streets of Willow: 1:27.7 CW 11/15/15; 1:29.5 CCW 8/15/15 \|\|\|\| Autoclub Speedway ROVAL (CCW): 1.52.6 - 12/2/17 Willow Springs - Big Willow (CW): 1:35.8 - 3/31/18 \|\|\|\| Buttonwillow #13 (CW): 1:59.3 1/27/18 https://www.facebook.com/JakeStumphRacing \|\|\|\| http://www.youtube.com/user/RaceMeMZ3
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10-12-2015, 04:01 PM	#4
tuj First Lieutenant 49 Rep 379 Posts Drives: '13 135i Join Date: May 2013 Location: Stamford, CT iTrader: (0)	we call them 'marbles' or 'clag'. __________________ Living the 1-life since 2013.
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