Use a log book, summit gives them away, Take excellent notes in it, from EVERY run.... bring a barometer, and a thermometer, in a few months you will be able to look in the book to dial your car. Pick your spot on the tree and adjust accordingly. Find what works and STICK with it. watch the guys you will be racing, pay attention to how and when they stage etc... and then you still have to be good and LUCKY.... LUKE