Our simulator now has support for multiple cars and tracks. This stunt track was donated by a friend of a developer which we'll use to test the suspension and physics. It's a bit bumpy in places so I raised the suspension to prevent it from bottoming out. I'm fiddling around with engine friction values to try to eek out some more realism before we release it to the public. Modelling a differential is a horrifically difficult task which I'm leaving to others. It's tricky, the car rolls over and crashes realistically but if the tire model, suspension or drivetrain are a little bit off it makes driving very difficult.