Throttle Deadzone: 0%
Throttle Sensitivity: 30%
Brake Deadzone: 10%
Brake Sensitivity: 15%
Controller Filtering Sensitivity: 50% (you should try different values to see what you like best). A higher value means smoother (less twitchy) steering but it can cause input lag.
Steering Deadzone: 5-10% (it depends on how worn your left stick is, 5% seems fine to me)
Steering Sensitivity: 0
Speed Sensitivity: 60-65% (this setting allows for small corrections, it basically makes the wheel less sensitive, especially on the straights)