Finally A Run With Nitrous But Inconsistent? Whats Wrong With These Times???

[1jimmy__d]

I was running street tires with the normal psi in them. My suspension is totally stock. I wanted to stay away from the "extra" nitrous accessories. The temp was in the 70's with mid to high humidity (dont have the slip with me). I dont have a bottle pressure reader or fuel pressure gauge, so i dont know them. MY plugs are gapped at the right gap .035. It ran pretty good over all. But, I dont think it has to do with the tire pressure or temperature. My first run was the best, and it was the first one on the bottle. So im thinking it has to be the bottle pressure. How do i purge it each time? Can i turn the bottle off, and then on (would that matter?) I want to stay away from buying the heater, and pressure gauges (my wife would kill me). I know the nitrous was working a little bit the other two times cause my best ever B4 the NOS was 14.2 and that was last year. I did kick a camaro's *** on the 13.5 run though!