ACE
I have a hard tail dragster that can run more that a second under I have an inline co2 cylinder with a pinch valve to slow the opening and I currently turn it on .15 and off in the 1.50 range I shift on time 1.0 second out so it comes off the stop in high gear.
To set your "on the stop RPM" disconnect the air line(s) and load it against brake (on jack stands of course) if you have an electric stop put a jumper wire on to turn it on to test on the brake. ( Mine is set at ~4500)
Shifting by RPM works too but it usually comes up pretty quick after the stop comes off.
I try to get one lap too fast and one too slow and calculate the ratio from there.
The crew chief pro software will get and keep you close but you can't put bad runs in it and expect it to be accurate pay attention to your 60' times if they are not consistent your data will be bad and so will your and or the software's predictions.
Just my way of doing it there are a lot of ways to skin this cat!
Hope this helps.
