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      05-07-2019, 05:16 PM   #1
danimal87
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Auto Club Speedway, irregular tire wear..

Hi everyone, I recently went to the HOD, 2 day HPDE event on the Roval; at beginning of April. About mid day on the first day I noticed that my right front tire was starting to cup on the outside edge. At first I thought it was just rubber build up but by the end of the second day it was a lot more noticeable. Is this maybe caused from the high speed bank? Currently on stock alignment.
Thanks, Dan
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      05-07-2019, 07:13 PM   #2
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This is normal at ACS. Passenger front tire takes most of the cornering load on T1 and T2. I speak from experience with multiple cars I've ran at that track. I was there this Sunday in my CS as well.
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      05-07-2019, 07:21 PM   #3
danimal87
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Quote:
Originally Posted by pfl View Post
This is normal at ACS. Passenger front tire takes most of the cornering load on T1 and T2. I speak from experience with multiple cars I've ran at that track. I was there this Sunday in my CS as well.
Good to know. I guess I'll just try swap them left to right in between sessions. Probably gonna take a razor to the high spots and see how it works out at Bimmerfest. Thanks 🤙
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      05-07-2019, 07:27 PM   #4
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I wouldn't do razor! Just rotate them for Bimmerfest. I'll be there as well most likely.
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      05-07-2019, 07:53 PM   #5
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I wouldn't do razor! Just rotate them for Bimmerfest. I'll be there as well most likely.
This is very good advice!!! ACS is NOT a track to do anything but run good tires due to the banking, load and speed! My best time is 1:47.1 and I go through a set of tires per day at ACS.

ACS is tough on tires, brakes and windshields!!!!

I'll be on the track during Bimmerfest as well, swing by and say "hi"!
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      05-07-2019, 07:55 PM   #6
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Quote:
Originally Posted by Caliboy951 View Post
Quote:
Originally Posted by pfl View Post
I wouldn't do razor! Just rotate them for Bimmerfest. I'll be there as well most likely.
This is very good advice!!! ACS is NOT a track to do anything but run good tires due to the banking, load and speed! My best time is 1:47.1 and I go through a set of tires per day at ACS.

ACS is tough on tires, brakes and windshields!!!!

I'll be on the track during Bimmerfest as well, swing by and say "hi"!
Gotcha, thanks! What PSI are you guys running?
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      05-07-2019, 08:15 PM   #7
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Quote:
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Gotcha, thanks! What PSI are you guys running?
I was running 27.5 cold with pirelli pzero's, then after the second session I took 2lbs out of the right side due to ambient temp.

Last edited by Caliboy951; 05-07-2019 at 08:33 PM..
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      05-07-2019, 10:51 PM   #8
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Quote:
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Quote:
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Gotcha, thanks! What PSI are you guys running?
I was running 27.5 cold with pirelli pzero's, then after the second session I took 2lbs out of the right side due to ambient temp.
1:47.1 on a stock F80?? I doubt but I thought I'd ask.
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      05-08-2019, 08:03 AM   #9
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1:47.1 on a stock F80?? I doubt but I thought I'd ask.
Stock, who said I was stock? Didn't the Pirelli PZero I mentioned give you a hint I wasn't stock?! lol

In case you think I wasn't truthful here's the video (in car gps showed 1:47.4 but Speed Ventures transponder showed 1:47.1:

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      05-08-2019, 08:59 AM   #10
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1:47.1 on a stock F80?? I doubt but I thought I'd ask.
Stock, who said I was stock? Didn't the Pirelli PZero I mentioned give you a hint I wasn't stock?! lol

In case you think I wasn't truthful here's the video (in car gps showed 1:47.4 but Speed Ventures transponder showed 1:47.1:

I actually did not mean that at all. I think I was parked a few garages beside you.

Mention of P Zeros could have meant non slick P Zeros that come on some street cars. Good time! I was I think in the same session as you a couple of times.
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      05-08-2019, 04:09 PM   #11
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Hey! ill be on the roval at bimmerfest too!! haha but yea over the times that ive been there uneven tire wear is pretty normal on that track T1-2 especially
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      05-08-2019, 06:42 PM   #12
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Quote:
Originally Posted by pfl View Post
I actually did not mean that at all. I think I was parked a few garages beside you.

Mention of P Zeros could have meant non slick P Zeros that come on some street cars. Good time! I was I think in the same session as you a couple of times.
Oh right on. It was rough last Sunday and I was having issues with some suspension setting I was testing. I was 3 seconds off what I should have but I couldn't get the car to settle on corner entry.

Are you going to be at Bimmerfest?
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      05-08-2019, 11:41 PM   #13
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Quote:
Originally Posted by Caliboy951 View Post
Quote:
Originally Posted by pfl View Post
I actually did not mean that at all. I think I was parked a few garages beside you.

Mention of P Zeros could have meant non slick P Zeros that come on some street cars. Good time! I was I think in the same session as you a couple of times.
Oh right on. It was rough last Sunday and I was having issues with some suspension setting I was testing. I was 3 seconds off what I should have but I couldn't get the car to settle on corner entry.

Are you going to be at Bimmerfest?
Yeah I'll try to come. I may not be in the CS though.
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      05-09-2019, 12:56 AM   #14
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Wow.. I saw both of you at speedventures ACS this Sunday too!

I was in the blue M3 with my friend's RCF, and grey M3. I snapped pics of both of your cars lol

But in all seriousness, stock f80 with exhaust, I ran 2:06 with crap tires and stock brakes.

No bubbles on my tires but they did start to crack after 3rd session. Ran about 27-29 psi cold, with mpss.
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      06-06-2019, 02:31 PM   #15
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Even if the track accelerated the wear, this is completely normal on stock alignment settings on any track. The stock alignment will eat your front tires up on the outside shoulders.
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      06-12-2019, 02:04 AM   #16
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Quote:
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Even if the track accelerated the wear, this is completely normal on stock alignment settings on any track. The stock alignment will eat your front tires up on the outside shoulders.
Interesting. So for a stock M3CS driven aggressively on the street do you guys recommend adding a little camber to offset outside shoulder wear?
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      06-12-2019, 09:37 AM   #17
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Interesting. So for a stock M3CS driven aggressively on the street do you guys recommend adding a little camber to offset outside shoulder wear?
No. Your stock alignment is setup for the street.

If you want to track the car then you'll want to add camber plates + adjust camber and toe a bit.

I'm still running stock alignment and my front outside shoulder wear is terrible. You can reduce the wear slightly by increasing your tire pressure to reduce the amount of sidewall that makes contact with the ground but it will make relatively small difference and take away from the tires performance.

I ran my NT-01s at around 38 PSI last weekend and I did get slightly reduced wear on the shoulder compared to usual but I sacrificed the tire's performance as it would have ran way better 5+ psi less.
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