I spray a 200 shot. I was going to get the timing tuner from thunder racing. It can be programmed to pull timing. But didn't use it. Geoff at EPS set mine up and tuned it also. Allen at nelson may be able to put a valet wire in your ecm. Ask him about the valet mode(depending what he uses to tune with-EFI live is in mine). I have a wire in my ecm(geoff installed it) that when it sees a ground(there is a relay in line with it tied into silenoid on n2o) it cuts 8 degrees automatically. It is called valet mode as far as I can remember. Saved 290 bucks and don't have to worry about it failing or anything.

Are you spraying a wet or dry shot? I would not go over a 100 shot dry(mass air sensor & fuel system may have trouble compensating for much more than that) and not over 150 wet on stock bottom end. Those are my 2 cents.