Solved Weird behaviour of AWD Powertrain | First Mod

Discussion in 'Mod Support' started by 2Brodt, Feb 17, 2026.

  1. 2Brodt

    2Brodt
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    Joined:
    Feb 16, 2026
    Messages:
    2
    Hello everyone,

    i'm currently working on my first mod for the game. Its a formula Student style car with an AWD hub Motor powertrain with 80kW of Power. It weighs 280kg at the moment and puts out 400Nm of torque at every wheel.
    It still has a lot of problems, but i will start with this one as it influences fixing all the others.

    The problem i am facing is, that the car behaves differently whether i am turnijng right or left. As im initiating a spin under power to the right, the FR wheel seems to start spinning very fast as the wheel is growing in size quite significantly. It ends with the car flipping upside down and the tire exploding.
    The problem is also showing, when i lift the car on the right side. in that case the FR wheel starts spinning up on its own until it eventually explodes due to the centrifugal force. On the left side this doesn't happen at all.
    You can all see this in the attached video.

    I noticed that this only happens if there is a force acting on the FL tire. When i lift the front of the car, the FR wheel only starts spinning if i pull on a node of the FL tire.

    I already double checked every jbeam file affiliated with the FR corner of the vehicle. Everything is coded symmetrically. But the problem can be something minor, as i don't really understand the powertrain system that well
    Has anyone ever experienced a similar problem? Any help will be greatly appreciated!

    Greetings from Germany.
     

    Attached Files:

    #1 2Brodt, Feb 17, 2026
    Last edited: Feb 19, 2026
  2. Ai'Torror

    Ai'Torror
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    QA, Mod Support, Vehicle Physics
    BeamNG Team

    Joined:
    Aug 29, 2015
    Messages:
    1,549
    Both of your front spindles try to connect to single wheel axle powertrain wise
    upload_2026-2-26_19-43-19.png
    Good way to debug any powertrain instability is to look at "powertrain debug" UI app, which would show you disconnected pieces of powertrain :)
     
    • Like Like x 1
  3. 2Brodt

    2Brodt
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    Feb 16, 2026
    Messages:
    2
    Oh wow how could I have missed that? :D
    Thank you very much!!!
     
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