Vehicle steering problems

[Coz]

So I'm trying to create a proper vehicle in bullet. It moves back and forward properly, but it won't steer correctly.

I turn around the wheel by about 0.5 radians, and applyForce to the rear wheels, but what happens is that the vehicle losses a lot of it's speed. On top of that, the vehicle has difficult moving in the direction of the wheels, sometimes even moving towards the opposite direction slowly.

One very special symptom is that the vehicle trouble is to steer towards the depth axis( Z in my case, as Y is up ) or while it is very close to this axis.

[Coz]

Apparently my problem was a bug in version 2.74 with the handling of m_rollInfluence, since upgrading to version 2.75 fixed it and the problem dissapeared when m_rollInfluence == 0.

Also, I'm impressed by the performance boost, the simulation runs *much* smoother now!