COTA tire wear

surlynkid · 02-22-2016, 09:28 AM

What kind of tire wear are people seeing at COTA running r-comps? Ortho281 and I are in the 2:32-2:34 times and are seeing massive abuse to the outside of the left front tire. While it is a CCW track, T2, T6, T13-14 and T16-18 are all long sweeping right hand turns. I am running -3.2 camber and zero toe. I would literally have to rotate tires every 2 sessions to prevent this. I am
Setting mine at 36 psi when I get back to the garage. I am curious what others are seeing and how they are managing it.

gobuffs · 02-23-2016, 06:47 PM

COTA tire wear is usually pretty good. You need to check tire temps across the surface. I don't think pressures are your problem. I think you need more camber. I know my car is different, but on my Hoosier slicks I am running at least 4 degrees of camber.

admranger · 02-24-2016, 10:44 AM

Quote:

Originally Posted by surlynkid

What kind of tire wear are people seeing at COTA running r-comps? Ortho281 and I are in the 2:32-2:34 times and are seeing massive abuse to the outside of the left front tire. While it is a CCW track, T2, T6, T13-14 and T16-18 are all long sweeping right hand turns. I am running -3.2 camber and zero toe. I would literally have to rotate tires every 2 sessions to prevent this. I am
Setting mine at 36 psi when I get back to the garage. I am curious what others are seeing and how they are managing it.

Which tires are you using and what are your starting/ending pressures?

Tire temps will help sort it out, no doubt, but I think it's safe to say the outside edge is getting super hot in steady state cornering situations based on the description above. What would be interesting is what the inner tread patch temps are after a long right hand turn...

Did you try adding 1psi cold to the LF or anything like that? I'm going to assume you aren't suffering from understeer in these corners.

surlynkid · 02-24-2016, 11:18 AM

R7. A friend contacted Hoosier to discuss R6 versus R7 for similar issues with his new GT4. He was told they are very different tires. R7 needs 39-41 hot which is way higher than R6. I will increase my pressures.

surlynkid · 02-24-2016, 11:30 AM

As an aside, while COTA tire wear due to track surface is usually excellent, they seem to be not cleaning the track like previously. We had so much OPR on the track that it was terrible. Everyone was picking up a ton of OPR which made a mess of tires. I have 3-4 sets I need to clean up and remove the OPR before I can use them again.

admranger · 02-26-2016, 03:44 PM

OPR = Other People's Rubber?

surlynkid · 02-27-2016, 06:47 AM

Quote:

Originally Posted by admranger

OPR = Other People's Rubber?

Yes

MasterP · 03-02-2016, 11:22 PM

I'm with you guys.

It doesn't matter what tire.

I've run Michelin GT's (which wear terribly, but they'll "work" even when they're basically dead) I was running 2:31-33 with some traffic before the cords started to appear. I didn't expect that kind of wear so quickly from an endurance tire. But I just kept flipping left to right to manage wear. Left Front took the biggest beating, left rear next. Wear appears on the outermost shoulder of the left front first and foremost. Then the inside of the left rear next. I kept the pressures in the 30 range cold mainly because the sidewalls aren't really stiff. I'll never use Michelins again. Sizes were the 30/65-18 square

My go to tire is the Pirelli DH. 305/645-18 I run Sub 2:30's consistently. Personal best is a 2:28:48. 2:29-30's regularly depending on traffic. Tire wear is again mostly on the left front. Outermost shoulder first. I will usually flip side to side every two sessions at COTA. Start the pressures around 27-28 cold. Keeping it around 33-35 hot.

My AD08R's were also more polished on the left front. When I had to switch to street tires when it got wet.

Left front from my experience at COTA is the left front is the first to wear, and by a large margin. Mainly T2, T6, T16-18 as those are long right handers and you carry a lot of speed, more so with aero.

Camber in front is -3.7, zero toe. My car is similar to ortho281. Except I'm 3370 pounds, and I have a little more aero with the larger rear wing and double dive planes. I'm hesitant to run more camber as I'm not wanting to take any stability out of the front end. But where it's wearing I don't think it will help noticeably. T6-T18 for me is where I think the majority of the wear is happening. That's a long right hander.

I picked up a few things from my last outing having to manage tires more since those michelins were dying faster than expected. I hope to be in the High 2:27 range when I head back in two weeks. I'm bringing an extra tire for the right front since it's a Two day. I'm also now running 18X11 Square so I'll be able to rotate and flip, vs just flipping side to side. Hopefully this gets me better wear.

02-22-2016, 09:28 AM	#1
surlynkid Major 115 Rep 1,470 Posts Drives: 2013 E92 M3 Join Date: Apr 2012 Location: League City, TX iTrader: (1) Garage List 2010 Porsche GT3 [0.00] 1988 Toyota 4Runner [0.00] 1995 Toyota T-100 4x4 [0.00] 2013 BMW M3 [0.00]	COTA tire wear What kind of tire wear are people seeing at COTA running r-comps? Ortho281 and I are in the 2:32-2:34 times and are seeing massive abuse to the outside of the left front tire. While it is a CCW track, T2, T6, T13-14 and T16-18 are all long sweeping right hand turns. I am running -3.2 camber and zero toe. I would literally have to rotate tires every 2 sessions to prevent this. I am Setting mine at 36 psi when I get back to the garage. I am curious what others are seeing and how they are managing it. __________________ Stoptech 380mm/355mm \| PFC08 / Pagid RS-29 \| Akrapovic EVO - CF tips \| Benvo Tune \| MS UDP \| AA air filter \| MCS 2-way with 700/1000lb springs \| Solid bushings and adjustable links \| RD front swaybar \| Apex EC-7 18x10 square 275/35-18 NT01 \| Turner Race Studs \| GT4 Brake Cooling \| GT4 Power Steering Cooling \| Alekshop Oil Cooler \| Performance Steering Wheel \| \| CF Spoiler \| Varis System 1 Full CF Diffuser \| Extended Paddle Shifters \| Schroth Quick Fit Pro \| Turner Steering Rack Stops \| Vorshlag Camber Plates
	Appreciate 0 Tweet Quote

02-23-2016, 06:47 PM	#2
gobuffs Captain 74 Rep 709 Posts Drives: E30 M3 S54 (race car) Join Date: Mar 2008 Location: Texas iTrader: (4)	COTA tire wear is usually pretty good. You need to check tire temps across the surface. I don't think pressures are your problem. I think you need more camber. I know my car is different, but on my Hoosier slicks I am running at least 4 degrees of camber.
	Appreciate 0 Quote

02-24-2016, 11:18 AM	#4
surlynkid Major 115 Rep 1,470 Posts Drives: 2013 E92 M3 Join Date: Apr 2012 Location: League City, TX iTrader: (1) Garage List 2010 Porsche GT3 [0.00] 1988 Toyota 4Runner [0.00] 1995 Toyota T-100 4x4 [0.00] 2013 BMW M3 [0.00]	R7. A friend contacted Hoosier to discuss R6 versus R7 for similar issues with his new GT4. He was told they are very different tires. R7 needs 39-41 hot which is way higher than R6. I will increase my pressures. __________________ Stoptech 380mm/355mm \| PFC08 / Pagid RS-29 \| Akrapovic EVO - CF tips \| Benvo Tune \| MS UDP \| AA air filter \| MCS 2-way with 700/1000lb springs \| Solid bushings and adjustable links \| RD front swaybar \| Apex EC-7 18x10 square 275/35-18 NT01 \| Turner Race Studs \| GT4 Brake Cooling \| GT4 Power Steering Cooling \| Alekshop Oil Cooler \| Performance Steering Wheel \| \| CF Spoiler \| Varis System 1 Full CF Diffuser \| Extended Paddle Shifters \| Schroth Quick Fit Pro \| Turner Steering Rack Stops \| Vorshlag Camber Plates
	Appreciate 0 Quote

02-24-2016, 11:30 AM	#5
surlynkid Major 115 Rep 1,470 Posts Drives: 2013 E92 M3 Join Date: Apr 2012 Location: League City, TX iTrader: (1) Garage List 2010 Porsche GT3 [0.00] 1988 Toyota 4Runner [0.00] 1995 Toyota T-100 4x4 [0.00] 2013 BMW M3 [0.00]	As an aside, while COTA tire wear due to track surface is usually excellent, they seem to be not cleaning the track like previously. We had so much OPR on the track that it was terrible. Everyone was picking up a ton of OPR which made a mess of tires. I have 3-4 sets I need to clean up and remove the OPR before I can use them again. __________________ Stoptech 380mm/355mm \| PFC08 / Pagid RS-29 \| Akrapovic EVO - CF tips \| Benvo Tune \| MS UDP \| AA air filter \| MCS 2-way with 700/1000lb springs \| Solid bushings and adjustable links \| RD front swaybar \| Apex EC-7 18x10 square 275/35-18 NT01 \| Turner Race Studs \| GT4 Brake Cooling \| GT4 Power Steering Cooling \| Alekshop Oil Cooler \| Performance Steering Wheel \| \| CF Spoiler \| Varis System 1 Full CF Diffuser \| Extended Paddle Shifters \| Schroth Quick Fit Pro \| Turner Steering Rack Stops \| Vorshlag Camber Plates
	Appreciate 0 Quote

02-26-2016, 03:44 PM	#6
admranger Retired Curmudgeon 2985 Rep 4,047 Posts Drives: ‘19 X3M40i, ‘18 m550i Join Date: May 2011 Location: Las Vegas, NV iTrader: (1)	OPR = Other People's Rubber? __________________ '19 X3 M40 Carbon Black/Oyster, '23 Jeep Grand Cherokee L Summit, Past BMWs: '18 M550i, '18 330 GT, '16 X5 40e, '11 E90M3, '06 X5 4.4, '03 330i ZHP, '02 M3, '97 Z3 2.8, '95 M3 (2x), '94 530i (manual), '92 525i (manual), '88 M3, '87 325iS
	Appreciate 0 Quote

03-02-2016, 11:22 PM	#8
MasterP Colonel 721 Rep 2,342 Posts Drives: All the M's Join Date: Aug 2012 Location: Where do you want me? iTrader: (8)	I'm with you guys. It doesn't matter what tire. I've run Michelin GT's (which wear terribly, but they'll "work" even when they're basically dead) I was running 2:31-33 with some traffic before the cords started to appear. I didn't expect that kind of wear so quickly from an endurance tire. But I just kept flipping left to right to manage wear. Left Front took the biggest beating, left rear next. Wear appears on the outermost shoulder of the left front first and foremost. Then the inside of the left rear next. I kept the pressures in the 30 range cold mainly because the sidewalls aren't really stiff. I'll never use Michelins again. Sizes were the 30/65-18 square My go to tire is the Pirelli DH. 305/645-18 I run Sub 2:30's consistently. Personal best is a 2:28:48. 2:29-30's regularly depending on traffic. Tire wear is again mostly on the left front. Outermost shoulder first. I will usually flip side to side every two sessions at COTA. Start the pressures around 27-28 cold. Keeping it around 33-35 hot. My AD08R's were also more polished on the left front. When I had to switch to street tires when it got wet. Left front from my experience at COTA is the left front is the first to wear, and by a large margin. Mainly T2, T6, T16-18 as those are long right handers and you carry a lot of speed, more so with aero. Camber in front is -3.7, zero toe. My car is similar to ortho281. Except I'm 3370 pounds, and I have a little more aero with the larger rear wing and double dive planes. I'm hesitant to run more camber as I'm not wanting to take any stability out of the front end. But where it's wearing I don't think it will help noticeably. T6-T18 for me is where I think the majority of the wear is happening. That's a long right hander. I picked up a few things from my last outing having to manage tires more since those michelins were dying faster than expected. I hope to be in the High 2:27 range when I head back in two weeks. I'm bringing an extra tire for the right front since it's a Two day. I'm also now running 18X11 Square so I'll be able to rotate and flip, vs just flipping side to side. Hopefully this gets me better wear.
	Appreciate 0 Quote