Question / Support Oversteer

Discussion in 'Automation' started by kravn, Nov 25, 2020.

  1. kravn

    kravn
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    I am trying to replicate a Datsun/Nissan 240Z. It has a tendency to oversteer when cornering. I tested several methods of trying to help get rid of this issue and have spent my entire day trying to figure out how to fix it. I think it has to do with the weight distribution because automation says that it has 56%front and 43% rear weight distribution, far from the 51/49 of the real car. Does anyone know how to fix this because it makes the car nearly undrivable.
     
  2. ThatCarGuyDownTheStreet

    ThatCarGuyDownTheStreet
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    a cheap fix would be to raise the front tire pressure, idk how to make the weight distribution better though... maybe try an aluminum block instead of cast iron?
     
  3. kravn

    kravn
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    I tried a aluminum block, and tubular headers, neither of which have helped fix the problem. I haven't tried raising the front tire pressure though.
    --- Post updated ---
    Adjusting the tire pressure doesn't help it either.
     
  4. Shadowfast

    Shadowfast
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    Have you tried playing with quality sliders? Increasing weight in some areas and decreasing in others may change the distribution - not by much but still may help. I managed a 2% shift on one of my cars but nothing on others so it depends from car to car.
    Did you want me to try have a look at the model itself?
     
  5. kravn

    kravn
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    Yes, They didn't do much to help the problem, I guess I could link the file on the first post if you want.
     
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  6. Shadowfast

    Shadowfast
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    I can give it a go. Nice challenge.
     
  7. trooperthegreat

    trooperthegreat
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    file editing can help.
     
  8. atv_123

    atv_123
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    While the weight distribution isn't helping, one thing you can do to reduce oversteer is to soften the rear sway bar (or remove it entirely) and stiffen the front sway bar. By doing this you are increasing the likelihood that your rear tires hold grip longer, and your front tires lose grip earlier.

    You can also try reducing your damping in the rear (again, to maximize keeping the rear tires gripped up) and increase the damping at the front... same for the spring stiffness.

    Finally, you can start messing with the camber and toe a bit. I recommend 0.2° inward toe on the rear tires (front of tires facing towards the front of the car are closer together) as then the rear of your car is always trying to slightly self center. Camber, I recommend nothing more than 2° front or rear. More than likely sticking with the 0.5° to 0.7° mark for the rears.

    Naturally, do this in small increments... if you go overboard, your gonna end up with car that just handles terribly and no one wants that.
     
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  9. kravn

    kravn
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    Thanks for suggesting this, I will try to see if this helps.
     
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