Michelin Pilot Sport 4S Tire Pressure

Discussion in 'Wheels & Tires' started by SgdriskillGT, Aug 5, 2018.

  1. SgdriskillGT

    SgdriskillGT Well-Known Member

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    #1 SgdriskillGT, Aug 5, 2018
    Last edited: Aug 5, 2018
    What tire pressures are you running for Michelin Pilot Sport 4S on S550 PP1?

    I have a 2018 PP1, and I’ve kept mine at 32 PSI cold per Fords spec for daily driving. When on the track, I’ve been dropping them to 35 PSI hot (approx 29/30 PSI cold)

    Had my car on a lift yesterday and noticed the middle of the tires are wearing faster than the inside and outside of the tires. More predominantly on the front than the rear, but happening on both axels.

    I guess that means the pressures are too high, but I wonder where other people are setting pressures and what are you seeing.
     
  2. 1 old racer

    1 old racer Well-Known Member

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    its not the tire pressure. It is the alignment. Check out other post on this topic.
     
  3. BmacIL

    BmacIL Enginerd

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    +1

    The factory alignment settings aren't great for this.
     
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  4. OP
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    SgdriskillGT

    SgdriskillGT Well-Known Member

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    Can you post a link to the other post? I can’t find it. Thanks!
     
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  6. BmacIL

    BmacIL Enginerd

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    Use these settings. Street Handling - BMR - Kelly.jpg
     
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    SgdriskillGT

    SgdriskillGT Well-Known Member

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    I meant to express that the middle of my tires are wearing faster than the outsides of the tires, i.e. the middle is worn more than both inside and outside of the tires.

    Do you still think it’s the alignment? Or something else?
     
  8. OP
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    SgdriskillGT

    SgdriskillGT Well-Known Member

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    I meant to express that the middle of my tires are wearing faster than the outsides of the tires, i.e. the middle is worn more than both inside and outside of the tires.

    Do you still think it’s the alignment? Or something else?
     
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    1 old racer Well-Known Member

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    Tire inflation. Google "tire wear chart"
     
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    SgdriskillGT

    SgdriskillGT Well-Known Member

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    Right, that’s what I thought it was. I’m wondering what PSI others inflate to.
     
  11. NightmareMoon

    NightmareMoon Well-Known Member

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    How are you measuring pressure? Do you have a good tire pressure gauge or the TPMS sensors?
     
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    SgdriskillGT

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    I have a good tire gauge, do not rely on TPMS.

    Only thing I can think of is that 35 PSI Hot is too high during track days.
     
  13. NightmareMoon

    NightmareMoon Well-Known Member

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    IDK, I ran a set of MPSS from new to dead at 32psi cold pressure, with only street use, and wear was even across the face. They actually wore out the inside edge due to camber/toe I assume.

    I'm guessing maybe its the track pressures too. I mean, how much of your tire wear is from street and how much is from track? (its mostly track wear, right?)
     
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    SgdriskillGT

    SgdriskillGT Well-Known Member

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    Tires are at 5k miles, and I’ve done 2 track days (2.5 hrs total session time). I have to assume it’s the track pressure that’s too high...but I feel like the tires get up to 35+ PSI off the track when they start at 32 PSI cold.
     
  15. NightmareMoon

    NightmareMoon Well-Known Member

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    Oh for sure, you definitely need to drop those starting pressures when you get to the track. < 36 psi hot is a good target, just to keep the shoulders from rolling over, but if you get bad wear at 35 hot, try a bit lower and see if the grip is still ok.

    I havent run them on a road course except twice and one of those was in the wet, so I cant say what to expect from wear at different hot track pressures.
     
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