If you are talking about a steering servo, I always hook it up to the reciever first and make sure it centered. Then I install it in the car and put the servo horn on so that the tires are as close to straight as possible. Then I go to the sub trim and adjust to make sure the wheels are straight. Then the balance menu to set the throw right and left. Turn the wheel to the right if the physical movement is limited then back off the setting to the left if you can go farther physically then increase the setting until you are limited physically on the car. Repeat for the other side. Most cars are pretty close right and left. The default balance travel is set to 70%. That's pretty much it until you get to the track. At the track I set the balance again to make sure that steering left to right is the same. I make a left circle then a right circle to see if they are the same size. If not then I adjust the balance again. At this point you are pretty much done. The you can just adjust the total throw known on other radios as dual rate, to limit the steering depending on how you like to drive around the track.