Hard to explain but it almost like reverses the ffb. So when u get forces you don't get any .Its weird I don't know even why its an option lol
It's just a matter of reference. Some wheel manufacturers use different references (like clockwise = positive, anticlockwise = negative). So if you want 70% of strength in your wheel, for Logitechs you will have to enter -70%, and for Thrustmaster +70%. If it's set incorrectly to your wheel, you won't feel a counter torque, but rather a torque assisting you on turning the wheel. The force is in the wrong direction.