when driving in a car that has a back wheel drive (olga, sarka) you can see them spinning out of control (especially sarka) even if you just press the gas pedal half way wihle going >70km/h in a slight curve. in reality, it requires a lot more force to accellerate something heavy into rotation especially when the weight of the car presses the wheels onto the road.

further more, i have noticed that if any car drives/jumps over a ledge, the car aggressively jolts into a rolling motion (direction depends on the remaining wheel) when three wheels lift of the ground. this is certainly not realistic and needs to be fixed.

given both of these occurences, my theory is that for rotational accelleration the physics engine doesn't take the mass and therefore inertia of the vehicle into account and uses no or at least a very small value of mass when calculating leverage.