GT350R PSC2 typical tire wear on outside?

Discussion in 'GT350 and S550 Technical Forum' started by FogCitySF, Jun 16, 2017.

  1. FogCitySF

    FogCitySF 2017 GT350R

    Messages:
    39
    Likes Received:
    24
    Joined:
    May 14, 2017
    Location:
    San Francisco
    Heading out for track day over next couple of weeks and notice that the smaller most outer groove of the PSC2s has maybe 1.5/32s left, while the two large inner grooves have 5/32 left. When the car was new I wasn't paying attention to see if that outer groove was more shallow to begin with vs the two inner grooves. Is that outer groove of the 3 supposed to be more shallow than the two inner ones? Thx.
     
  2. VoodooBoss

    VoodooBoss Rick Moderator

    Messages:
    20,436
    Likes Received:
    2,826
    Joined:
    Nov 30, 2010
    Location:
    90 Miles East of Sonoma Raceway
    Yes the outer portion basically becomes a slick.
     
    Eritas and FogCitySF like this.
  3. C7 B8

    C7 B8 TMO Advanced

    Messages:
    124
    Likes Received:
    21
    Joined:
    Nov 13, 2015
    Yes outer grooves almost disappeared on my Cup2s from two track days. And I don't consider myself hard on tires. I'd suggest setting front camber to -2.5.
     
    FogCitySF likes this.
  4. Etchhead

    Etchhead TMO Intermediate

    Messages:
    31
    Likes Received:
    11
    Joined:
    May 21, 2017
    Location:
    Portland
    What Ian the max neg camber you can get with the MM CC plates?
     
  5. VoodooBoss

    VoodooBoss Rick Moderator

    Messages:
    20,436
    Likes Received:
    2,826
    Joined:
    Nov 30, 2010
    Location:
    90 Miles East of Sonoma Raceway
    I'm running -1.8 but I believe you can get close to -2.5. The outer part of the tire is supposed to wear into a slick so that's normal.
     
  6. Track Pony

    Track Pony TMO Intermediate

    Messages:
    12
    Likes Received:
    6
    Joined:
    May 22, 2017
    Location:
    Dallas, TX
    Any rough idea on the life of the Cup2's with -2.5 degress of camber? Track driven only and rotated after each track day.
     
  7. mnmike59

    mnmike59 TMO Advanced

    Messages:
    101
    Likes Received:
    64
    Joined:
    Jun 15, 2016
    Location:
    Prior Lake
    FogCitySF and Track Pony like this.
  8. Track Pony

    Track Pony TMO Intermediate

    Messages:
    12
    Likes Received:
    6
    Joined:
    May 22, 2017
    Location:
    Dallas, TX
  9. VoodooBoss

    VoodooBoss Rick Moderator

    Messages:
    20,436
    Likes Received:
    2,826
    Joined:
    Nov 30, 2010
    Location:
    90 Miles East of Sonoma Raceway
    I ran 24 heat cycles on my first set but they were done after 20 and possibly sooner than that. They had rubber left on them but their grip dropped off noticeably I'm shooting for 20 on my new set which will be four track days plus driving to and from the track. Another option is the Pirelli Trefeo R in 305/30/19 or 325/30/19.
     
  10. Etchhead

    Etchhead TMO Intermediate

    Messages:
    31
    Likes Received:
    11
    Joined:
    May 21, 2017
    Location:
    Portland
    I just ordered MP4S for my NFS wheels doing street duty and will leave Carbon/Cup2s for track. I'm up in Portland and it gets a bit wet and knownthw 4S will treat me well.

    Looking forward to LS in Aug with CFRA.net- so far my 420 break-in Miles have been incredible and these Cup2s are rediculous!
     
    VoodooBoss likes this.
  11. FogCitySF

    FogCitySF 2017 GT350R

    Messages:
    39
    Likes Received:
    24
    Joined:
    May 14, 2017
    Location:
    San Francisco
    once the outer portion becomes a slick, approximately how many track days do you think would be doable if the inner grooves have 2/32+ left? thx

     
  12. CSL

    CSL TMO Advanced

    Messages:
    173
    Likes Received:
    70
    Joined:
    Jan 7, 2016
    With only 2-4/32s left on inner grooves you have about one more day. I just went to the track yesterday with about 4/32s on front and now they're pretty much done.

    I am getting 2+ times the life from the rears. I will get a couple seasons out of the rears; whereas I am getting about 5 track days out of the fronts. At -2 camber I am getting pretty even wear. I may dial in a little more camber for next season.
     
    FogCitySF likes this.
  13. VoodooBoss

    VoodooBoss Rick Moderator

    Messages:
    20,436
    Likes Received:
    2,826
    Joined:
    Nov 30, 2010
    Location:
    90 Miles East of Sonoma Raceway
    On my first set I ran them 25 heat cycles (25 20-30 min sessions) and they heat cycled out but still had rubber left on them. I'm not the most aggressive driver and most of those laps were at Thunderhill which is not hard on tires. I'm only planning on running mine 20 heat cycles with my new set. I'm on 305 square and rotated them after each track day and have MM CC plates set at -1.8.
     
  14. FogCitySF

    FogCitySF 2017 GT350R

    Messages:
    39
    Likes Received:
    24
    Joined:
    May 14, 2017
    Location:
    San Francisco
    Thanks, my rears are actually wearing out more on the outer grooves, but inner groves is the same as front 3-4/32nd. Granted running camber -2.0 front and -1.2 rear; what is your rear camber setting?

     
  15. VoodooBoss

    VoodooBoss Rick Moderator

    Messages:
    20,436
    Likes Received:
    2,826
    Joined:
    Nov 30, 2010
    Location:
    90 Miles East of Sonoma Raceway
    -1.25, factory R track specs. Are you rotating your tires?
     
  16. FogCitySF

    FogCitySF 2017 GT350R

    Messages:
    39
    Likes Received:
    24
    Joined:
    May 14, 2017
    Location:
    San Francisco
    Running the stock R wheels not a square setup...either side has the same wear pattern/depth so haven't swapped sides.
     
    VoodooBoss likes this.
  17. CSL

    CSL TMO Advanced

    Messages:
    173
    Likes Received:
    70
    Joined:
    Jan 7, 2016
    Same rear camber for me as Rick. I don't rotate as I find I'm getting quite a bit more life from the rears as is. i cross rotate each track day. I still have great grip on the rears. I do about six events per year running 5 to 7 20 minute sessions, so there's the math. I like the bit of extra sidewall in the rear and prefer to run offset specific wheels.

    If I was going through rears nearly as quickly as fronts I would rotate, but this system is working out for me thus far.
     
    FogCitySF likes this.

Share This Page