А что вот это такое? С чем это едят:
public native void Vehicle.SetPitchBasedOnSpeed(float multiplier)
Sets the pitch of this vehicle based on its speed.
Parameters:
multiplier Value which will cause the vehicle to pitch based on its velocity.
public native void Vehicle.SetPitchBasedOnTrack(bool pitchBasedOnTrack)
Enables/disables the pitch of this vehicle to be based on the track.
Parameters:
pitchBasedOnTrack If true, pitch of this vehicle (up/down) will be based on the track. Default is false.