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Question by HolBol · Apr 21, 2010 at 03:39 PM · carwheelcollider

car Wheelies uncontrollably

When I accelate, my car starts to wheely from it's back wheels. I am using a cube and 4 wheel colliders for this. Any Ideas?

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Answer by spinaljack · Apr 21, 2010 at 03:44 PM

Lower your centre of gravity

rigidbody.centerOfMass = Vector3 (0, -2, 0);

also try adding relative down force as you go faster

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avatar image spinaljack · Apr 21, 2010 at 03:45 PM 0
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You'll have to experiment with this depending on the size of your model, 1 unit is about 1 meter.

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Answer by duck · Apr 21, 2010 at 03:44 PM

You could probably correct this a few different ways:

  • make the cube heavier (increase the mass on its rigidbody),
  • decrease the grip on the wheels (so they spin instead of gripping at a high torque)
  • decrease the power to the wheels
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Answer by Maclypse · Jul 04, 2010 at 11:17 AM

There's actually even more things that can cause wheelies, and I found most of them... :)

  • Mass too low
  • Center of mass too high
  • Center of mass too near rear wheels
  • Drag is too high (high-speed flips)
  • No downforce (high-speed flips) some vehicles should have downforce at speed
  • Friction too low (low speed flips) tires should spin before the car flips
  • Too much engine power
  • Suspension too bumpy - it can be enough to lift the front on a small jump and start a flip

I wish I could give some guidelines as to what values to use, but I'm still in the testing stages myself, so I can't really offer much help as to specifics.

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