Tire Wear after AutoX - More camber or more pressure?
Results 1 to 10 of 10

Thread: Tire Wear after AutoX - More camber or more pressure?

  1. #1
    Join Date
    Nov 2016
    Location
    New York
    Posts
    7
    Likes (Given)
    4
    Likes (Received)
    1
    Downloads
    4
    Uploads
    0

    Question Tire Wear after AutoX - More camber or more pressure?

    Hello all!

    After the first autocross in my 981 BS with PASM in not-freezing temps, I noticed that the outside shoulder of the front wheels were showing more wear than the inside. Attached is a photo of the left-front 20" Pirelli Pzero (the right-front outside shoulder looked identical). Started at 33PSI cold and they crept up to 35psi hot. I'm not sure what the alignment is, but it should be OEM. The rears looked more even.

    Grip started to get pretty good until they overheated and got pretty greasy. Just wanted your feedback if wear like this can be caused by running too low of a pressure, and how much increasing the neg-camber would alleviate this.
    Attached Thumbnails Attached Thumbnails Tire Wear after AutoX - More camber or more pressure?-20180401_144557-jpg   Tire Wear after AutoX - More camber or more pressure?-20180401_144618-jpg  

  2. Remove Advertisements
     

  3. #2
    Join Date
    May 2013
    Location
    Georgia
    Posts
    1,192
    Likes (Given)
    244
    Likes (Received)
    232
    Downloads
    2
    Uploads
    0

    Re: Tire Wear after AutoX - More camber or more pressure?

    Definitely more neg camber would help for sure. When you say they got overheated and got greasy how were the tire pressures then?

  4. #3
    Join Date
    Nov 2016
    Location
    New York
    Posts
    7
    Likes (Given)
    4
    Likes (Received)
    1
    Downloads
    4
    Uploads
    0

    Re: Tire Wear after AutoX - More camber or more pressure?

    35PSI was when they were the hottest. It stayed at 35PSI for the last few runs, but the last two is when they felt greasy

  5. Remove Advertisements
    Planet-9.com
    Advertisements
     

  6. #4
    Join Date
    Oct 2016
    Location
    Ontario
    Posts
    255
    Likes (Given)
    29
    Likes (Received)
    52
    Images
    6
    Downloads
    4
    Uploads
    0
    Blog Entries
    1

    Re: Tire Wear after AutoX - More camber or more pressure?

    Honestly, what you are showing is completely normal. I wouldn't do anything, unless you are getting serious about autocross or track driving. If you add negative camber, your tires will wear more on the inside during regular driving. In general the Pzeros are known to wear out quickly.
    2010 Porsche Cayman, Midnight Blue, Toronto, Canada

  7. #5
    Join Date
    May 2013
    Location
    Georgia
    Posts
    1,192
    Likes (Given)
    244
    Likes (Received)
    232
    Downloads
    2
    Uploads
    0

    Re: Tire Wear after AutoX - More camber or more pressure?

    I thought my tires would wear out with regular driving with the max front and rear cambers on my Spyder. So far I have had 3 track days on the Pirelli tires and 9000 miles on the clock altogether. Tires look to be in great condition. Now I am not sure how many miles people expect to get on their Pirellis or on their Cayman/Boxsters because I could get 20k out of my rears on my M3 running Michelin Supersports tires and doing 2 track days a year. So I guess I should add a YMMV on the whole increase your camber suggestion. But I do agree with olegd that your tires don't look that bad. Most of it looks like pickup from the road or just the tread edges are a bit knackered from the punishment. Were you understeering a lot by any chance?

  8. #6
    Join Date
    Jan 2016
    Location
    Washington
    Posts
    705
    Likes (Given)
    3
    Likes (Received)
    136
    Images
    2
    Downloads
    2
    Uploads
    0
    Blog Entries
    1

    Re: Tire Wear after AutoX - More camber or more pressure?

    A good competitive alignment with OEM limits of -1.5f and -2.0r will certainly help you out managing your tire scrub, depending on your driving style. Some autocross drivers slide their cars around the track more than others. "Speed secrets, Winning autocross techniques" by Ross Bentley will help you get an idea of tire management, the traction circle and slip angle to preserve your outside tire shoulders.
    I have almost 18k on my Michelin PSS that I use now for daily drives. These really took a beating last year in autocross before I purchased a set of race wheels, 9 in F and 10 in R and tires. I now have camber at -2.6 front and -2.5 rear, RE71R's tires and really do not expect to have excessive inside wear due to the camber. I have 0 toe in front and minimal toe in in the rear.
    Autocross last Sat was brutal with cold rain. One of my competitors told be to lower my pressures to 25 F and 27 in the rear, thats with RE71R's. I sort of followed his thought by lowering to that pressure on my last run. I have wide enough wheels to support the sidewall enough and camber to support the roll over of the tire. This seemed to work for me, the guy who suggested this pressure was running Hoosier rain tires and wide wheels and his pressures were 22 PSI F and 24 R. He had top time for the morning session.
    My next alignment will include front and rear Elephant adjustable toe links as well as toe out of 5 minutes in front.
    I drove home on these pressures and it was a dream following about 5 Porsches down a back country road to get to the freeway home. The low pressures, wide wheels and camber seemed to work on the back country wet roads, just like at the track. Just goes to show you that high pressures are not the only way to fly, especially on the cold, wet, slick runway and wet back country roads.
    Last edited by Apex1; 04-16-2018 at 06:09 PM.

  9. #7
    Join Date
    Jul 2013
    Location
    texas
    Posts
    722
    Downloads
    4
    Uploads
    0

    Re: Tire Wear after AutoX - More camber or more pressure?

    Toe out may be ok for AX, but man let me know how that feels braking into high speed corners from the 100 mph range or going into a chicane from 120-140 mph.

    Finally figured out how to shrink my new avatar picture to make it fit. COTA infield section during a track walk. Well I wasn't exactly walking, but at school zone speeds, they didn't bother those of us taking some pictures.
    Last edited by lovetoturn; 04-11-2018 at 09:57 PM.

  10. #8
    Join Date
    Apr 2012
    Location
    CA
    Posts
    2,724
    Likes (Given)
    1124
    Likes (Received)
    1047
    Images
    5
    Downloads
    5
    Uploads
    0

    Re: Tire Wear after AutoX - More camber or more pressure?

    Tires wear look fine, I think you just entered the turn too fast and plowed. Anyway, if you max out your OEM camber you'll be pleasantly supprise that tires wear still very evently from normal driving.
    Q
    2013 Boxster S - 6 M/T and 2010 Cayman - 6M/T

  11. #9
    Join Date
    Feb 2016
    Location
    ca
    Posts
    25
    Likes (Given)
    0
    Likes (Received)
    4
    Downloads
    3
    Uploads
    0

    Re: Tire Wear after AutoX - More camber or more pressure?

    tire wear is just part of autox. you can add as much neg camber as you can get and increase pressure but the edges of the tire will still wear. it is hard to get even wear when you are pushing the car to the limit.

    i ran my cayman with OEM alignment and Re71r tires for two years in auto-x and i had to flip the front tires mid season, 5 events, and replace at the end of the year. the rears lasted 2 years and i flipped them before the second season. using 32-34 psi.

    if you are worried about wear get some good directional tires and flip the tire on the wheel before the tire starts to cord i'm sure the guys at your autox can help.

  12. #10
    Join Date
    Jul 2013
    Location
    texas
    Posts
    722
    Downloads
    4
    Uploads
    0

    Re: Tire Wear after AutoX - More camber or more pressure?

    I think my head was on another thread when I mentioned toe out in the rear. I would agree that the wear in the px is normal for AX. Pressures seem ok. Agree 100% with qhb, tires don't wear as unevenly as you might think with the higher negative camber. My mechanic has always told me that, and that is what I have seen in practice as well.

  13. Remove Advertisements
     

Similar Threads

  1. Question More HP OR More Agility
    By zedd06 in forum 987 Cayman and Boxster Chat
    Replies: 8
    Last Post: 07-23-2008, 01:04 PM
  2. HIDs ... More Common or Less Common?
    By chows4us in forum General Off-Topic
    Replies: 5
    Last Post: 09-04-2007, 06:36 PM
  3. Max Stock Camber and Tire Wear
    By yz250 in forum 987 Cayman and Boxster Competition
    Replies: 2
    Last Post: 04-04-2007, 09:20 PM
  4. More camber with lowering
    By dt in forum 987 Cayman and Boxster Competition
    Replies: 25
    Last Post: 11-27-2006, 05:35 PM
  5. Higher Octane ... More Power or a myth?
    By chows4us in forum 987 Cayman and Boxster Chat
    Replies: 7
    Last Post: 10-14-2006, 06:12 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •