Ok, here's the bug. I go into a RWD D15, and I turn right sharply. The back end starts to slide around, and then I jab on the left arrow key. The steering wheel does not turn left unless I press the key AGAIN, and then it is too late. I spin. I have also turned off dynamic steering, also.
It's a known bug and the devs are working on a fix. http://www.beamng.com/threads/1728?p=22559&viewfull=1#post22559