How are you comparing this? Are you measuring wheel angle on the wheels of the car model e.g. not comparing the visible wheel representation vs your actual rotation. Unfortunately I also haven't heard about this. Where did this information come from? The driver requests rack speed (ratio) and maximum throw, don't they? Which are the options we have. This does describe a variable steering ratio but do you mean variable power assisted steering? I have heard race cars have that. Possibly dw12. Two very different things though.