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Tyre temperatures

Discussion in 'Assetto Corsa' started by Grabarz, Mar 12, 2017.

  1. Grabarz

    Grabarz

    Messages:
    62
    Ratings:
    +9
    Hello There once again I'm trying to rebalance my version of Nissan ...

    Ive managed to add new tyres, rebalance brakes, added horse power, etc.

    Since i knew that Z-tune is running on 265/25R19 tyres i replaced them with Mclaren P1 front tyres

    now my car has proper traction and somehow good cornering however i can't control tyre temperatures
    I'm starting with 32 psi pressure and ending with 39-40 psi after just one lap at nordschleife :/


    WIDTH=0.265
    RADIUS=0.3208
    RIM_RADIUS=0.254
    ANGULAR_INERTIA=1.70
    DAMP=600
    RATE=323960
    DY0=1.6426
    DY1=-0.044
    DX0=1.5866
    DX1=-0.044
    WEAR_CURVE=__cm_tyre_wearcurve_rear_4.lut
    SPEED_SENSITIVITY=0.003161
    RELAXATION_LENGTH=0.07471
    ROLLING_RESISTANCE_0=12
    ROLLING_RESISTANCE_1=0.00050
    ROLLING_RESISTANCE_SLIP=5245
    FLEX=0.000448
    CAMBER_GAIN=0.097
    DCAMBER_0=1.5
    DCAMBER_1=-13
    FRICTION_LIMIT_ANGLE=7.1
    XMU=0.22
    PRESSURE_STATIC=23
    PRESSURE_SPRING_GAIN=1980
    PRESSURE_FLEX_GAIN=0.4
    PRESSURE_RR_GAIN=0.55
    PRESSURE_D_GAIN=0.0045
    PRESSURE_IDEAL=32
    FZ0=3468
    LS_EXPY=0.7461
    LS_EXPX=0.8089
    DX_REF=1.51
    DY_REF=1.48
    FLEX_GAIN=0.041
    FALLOFF_LEVEL=0.88
    FALLOFF_SPEED=2
    CX_MULT=1.08
    RADIUS_ANGULAR_K=0.02
    BRAKE_DX_MOD=0
    __CM_SOURCE_ID=ferrari_laferrari

    [THERMAL_FRONT_4]
    SURFACE_TRANSFER=0.0180
    PATCH_TRANSFER=0.00024
    CORE_TRANSFER=0.00024
    INTERNAL_CORE_TRANSFER=0.0034
    FRICTION_K=0.05779
    ROLLING_K=0.21
    PERFORMANCE_CURVE=__cm_tyre_perfcurve_front_4.lut
    GRAIN_GAMMA=1
    GRAIN_GAIN=0.5
    BLISTER_GAMMA=1
    BLISTER_GAIN=0.5
    COOL_FACTOR=1.82
    SURFACE_ROLLING_K=0.96492


    Can someone explain to me how to decrease pressure gain ? since tyre temperature seems to be normal ...
     
  2. Qazdar Karim

    Qazdar Karim

    Messages:
    1,137
    Ratings:
    +561
    CORE_TRANSFER=0.00024

    try a value around 0.004
     
  3. Grabarz

    Grabarz

    Messages:
    62
    Ratings:
    +9
    wait You are suggesting that tyre pressure gain lies into tyre temperature section ?
     
  4. Grabarz

    Grabarz

    Messages:
    62
    Ratings:
    +9
    ok so i tried
    i changed value in CORE_TRANSFER under THERMAL_FRONT/REAR category from 0.00024 to 0.004 well i can't see much difference in tyre pressure

    it's still rising like crazy
    1.png
     
  5. Qazdar Karim

    Qazdar Karim

    Messages:
    1,137
    Ratings:
    +561
    CORE_TRANSFER=0.00024
    INTERNAL_CORE_TRANSFER=0.0034

    set both to 0 and start from there :)
    you will have constant pressure with 0 :)
     
  6. Grabarz

    Grabarz

    Messages:
    62
    Ratings:
    +9
    I do not want a godlike tyres :)
    I think my problem lies in the car ...
    Nissan has 70:30 weight distribution and weights 1600kg meanwhile McLaren P1 which tyres i used weights max 1250kg and has weight distribution about 50:50 ...
    Under braking Front tyres pressure is rising to fast i think ( look the screen above ) - anyway in real life under hard braking tyre pressure is dropping it isn't ?

    tomorrow i will start testing hopefully i will find out
     
  7. Grabarz

    Grabarz

    Messages:
    62
    Ratings:
    +9
    OK after many hours of adjusting, driving, crying for God's help i figured it out ...

    i think so :)

    Since Godzilla is heavy front tyres suffer the most under braking - well many people including me could say that, but the truth is Godzilla tyres suffer the most under cornering ... maeby not for everyone but for me it's 100% true. MY front tyres temperatures were rising like crazy on every track every corner since i knew that i tried to readjust tyres temperatures in this category:
    [THERMAL_FRONT_4]
    SURFACE_TRANSFER=0.0180
    PATCH_TRANSFER=0.00024
    CORE_TRANSFER=0.00024
    INTERNAL_CORE_TRANSFER=0.0034

    However it made the tyres so so... they were better but still not even close to what i needed ( +9 psi after 3 mins driving, then about 8 psi after 3 mins driving )

    I felt confused, most of my work was for nothing i never wanted to create static tyre pressure. I tried many different cars and, studied their tyres files, and then i realized everything what i was looking for were just under my nose
    [THERMAL_FRONT_4]
    SURFACE_TRANSFER=0.0180
    PATCH_TRANSFER=0.00024
    CORE_TRANSFER=0.00024
    INTERNAL_CORE_TRANSFER=0.0034
    FRICTION_K=0.05779
    ROLLING_K=0.21

    PERFORMANCE_CURVE=__cm_tyre_perfcurve_front_4.lut
    Friction - this bit*ch is guilty of my frustration - many tries later, tyres pressure are about +5/6 psi after 3 laps on Nordschleife all around 8:00 mins
    and this is how it looks now:
    SURFACE_TRANSFER=0.0180
    PATCH_TRANSFER=0.00027
    CORE_TRANSFER=0.0012606
    INTERNAL_CORE_TRANSFER=0.0034
    FRICTION_K=0.02581
    ROLLING_K=0.16
    PERFORMANCE_CURVE=__cm_tyre_perfcurve_front_4.lut
    GRAIN_GAMMA=1
    GRAIN_GAIN=0.5
    BLISTER_GAMMA=1
    BLISTER_GAIN=0.5
    COOL_FACTOR=1.85
    SURFACE_ROLLING_K=0.96492

    Thank You Qazdar Karim for help :)
     
  8. Qazdar Karim

    Qazdar Karim

    Messages:
    1,137
    Ratings:
    +561
    Glad you managed to fix it :)