Agree with all here that have said car has to be consistent. I've never played around with the dial in. Ive always dialed what I think the car will run flat out. I had one last year, I don't remember the exact dials, I was an 11.83 and the other guy, I think, was like a 12 flat. So, he got the leave. I knew I cut a decent light. But, by a 100 ft. I went around him. Had a half a car the whole way down. Dumped it right at the stripe. I went 11.88 and knocked five mile an hour off. I wasn't sure what the hell to do but it worked out. If I'm ahead coming up on the stripe I'll usually womp it a couple just to insure I don't break out.