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Weight Transfer in BeamNG

Discussion in 'General Discussion' started by Makoto H., Jan 3, 2016.

  1. Makoto H.

    Makoto H.
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    How accurately does BeamNG currently model weight transfer? I took the Bolide out for a spin on Gridmap. To my surprise, when I lifted off the gas and tried to steer, instead of getting the expected lift-off oversteer the car understeered. I decided to try again, this time with the Barstow (which is pretty much the exact opposite of the Bolide). Once again, lifting off induced understeer, whereas keeping the throttle on and turning induced oversteer (I know that too much speed will force oversteer as the rear tires lose grip, but we're talking a smoky spin from the slightest bit of steering). For a third test, I used the Race Covet, which actually did understeer at high speeds, but I attribute that more to its FWD drivetrain than weight transfer. Is there a reason why this happens, as my experience with racing sims show me the opposite should happen.
     
  2. Ukkone...

    Ukkone...
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    What controller are you using ? I think weight transfer is good, can do scandinavian flicks and all that. Also what speeds you was going ?
     
  3. Makoto H.

    Makoto H.
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    I was just testing with a Dualshock 4, though I have a G27 (didn't feel like setting it up). I was generally trying at about...60-80MPH, roughly.
     
  4. SixSixSevenSeven

    SixSixSevenSeven
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    things such as weight transfer aren't programmed into the game as such, rather the accurate general physics simulation still exhibits it normally. I've had no issues with weight transfer
     
  5. randomshortguy

    randomshortguy
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    The Bolide has been tamed, the suspension setup and tire dimensions are heavily tuned towards understeer, but lift-off oversteer does happen if you're pushing the 350GT really hard around a corner, try it at Hirochi Raceway. If you put the same tire dimensions on the Bolide, it's all oversteer, all the time, and you can't recover from it either, the back end goes out and you're in a barrier.
     
  6. amarks240

    amarks240
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    It's accurate. You might not get the steering force you want if your pushing the stick all the way to one side and turning the wheel to full lock. Steering is not speed sensitive.
     
  7. Goosah

    Goosah
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    BeamNG Team

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    Weight transfer is determined by things like vehicle mass and where it is located as well as suspension geometry, chassis, spring, damper, and anti roll bar tuning. I've tested, compared, designed all of these parts of the cars individually and made sure they are realistic. And since at the very basic level our physics engine has a uncompromising adherence to newtonian physics, I know that it can all come together correctly and that "weight transfer" is correct based on the vehicle design.

    The grip of a tire in real life is affected by load (load sensitivity). A heavier load on the tire causes it to lose cornering stiffness, which means it has to slip more laterally to generate the cornering force. Our tires have load sensitivity, but right now, there is a bit too much. So, when you hit the gas in the Bolide, weight shifts rearward on an already rear heavy car, lowering the cornering stiffness of the rear, and increasing the cornering stiffness in the front. The result is oversteer, because the back slips laterally more than the front. And the opposite behavior can be true of our fwd cars. Basically, too much load sensitivity makes it harder to get that knife edge handling balance. But I am actually working on this lately with my new tire tester. That's why I got excited to write this ;)

    Even so, the handling of a car is controlled as much by tuning the suspension to manage weight transfer as it is the tires. So, even if there is room for improvement with the tires, I bet you can find the handling balance you want by playing with... our new tuning menu ;) In particular, playing with toe in and sway bars have a big effect.
     
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  8. RobertGracie

    RobertGracie
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    So your saying the Bolide is overly sensitive well we all know that, but is it possible to make a suspension setup that could counter that?
     
  9. lukerules117

    lukerules117
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    Yep, if you raise the rear, lower the front, give the rear wheels more negative camber, or plenty of other things that should make it a lot less oversteer prone.
     
  10. RobertGracie

    RobertGracie
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    I am extremely crap at the setup wise can you give me the ideal numbers please?

    I need it to be as if the car was on rails....
     
  11. SixSixSevenSeven

    SixSixSevenSeven
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    you probably won't get it on rails, there's only so much you can do with tuning alone

    have a play, trial and error
     
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  12. RobertGracie

    RobertGracie
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    I know trial and Error, I would love to see an easier set up options so it comes preloaded with some setups, I find it difficult at times to find the right balance...sometimes preloaded setup can help if your no good at tuning a preload would be helpful...or a how to guide of how to using the "Tuning" Tab...its an idea...but I donno if it could be implemented...but thanks anyway sixsixsevenseven :)
     
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