Long story short, put a NX universal wet kit on buddy's car not too long ago took it to the dyno, sprayed it till about 6000 before it started to go lean, so we took it home, put a fuel pump in it, took it back to the dyno and now the kit will only spray until 4500 each time, it consistently shuts off at 4500 rpm. Bottle pressure and fuel pressure were good on these runs. Limits in the window switch are still correct 3200 upper limit 6500. Also b/w dyno sessions my buddy had a local circle track guy put a fuel pressure and nitrous pressure gauge in which he used teflon tape for instead of the red loctite provided, and we had to fix a bad fuel leak where he spliced in to the fuel line, but I doubt any of this would have caused the problem.

My question is could the window switch be showing the correct limits and actually telling the nitrous to cut off at 4500?? Like a bad signal or something? I am lost, any help would be greatly appreciated

 

you need to make sure it is in the right mode for the rpm. i think my digital switch is set on 2 or 4 cyl cant remember but there is a diff if you pull the signal from 1 coil or the tach signal.

might want to look at that.if it is digital then just compare rpms to the tach in the car at say 3500 rpm's or so

 

Awesome, thanks, I will try that.

 

It needs to be in 4cyl mode. Double check your connections. You could be getting a bad reading if you have a loose connection. You may just have a bad box also. I've never had any problems with mine, but I know some that have.