Video: (coming soon) Step 1: Locate your car in the content\vehicles folder. Step 2: Open the file yourcar_suspension_f.jbeam with Notepad++ or a similar software that can edit JBeam. Step 3: Search for the line (Ctrl+F) "steeringWheelLock". Step 4: Your line should look like this: "steeringWheelLock":XXX. Change the number there to 450. Then save. Enjoy your 900 degree steering!
If I wanted a wheel that only did a quarter of a turn, I would set the value to 90. It is how many degrees from the centered wheel to either side.