turning the screw out to the left will make the car shift faster and turning the screw to the right down it will make it shift later and if you go sall the way down not tight but snug it won't shift at all. Now when you go to turn it to the left that means out don't turn it to much or it will fall out. So just make small adj at a time and then run the car for two to five min and see if it's where you want it at. A old timer told me to look at making adj like looking at a clock and do it in one hour adj at a time. Hope this helps.