I need help figuring something out. Tonight I sprayed the car for the first time. First run was perfect, second run it started to cut out on me so I backed off. Purged the lines again to make sure it was still at the solenoid. The third and final run, it was fine through 3rd gear, then went to 4th, got back on the throttle and it backfired on me. The car still runs perfectly and nothing is wrong from what I can tell. All three runs started in 3rd gear above 3000 rpm and went through 4th.
Bottle pressure was just above 900psi. I've got an automatic bottle heater and I checked the guage before and after the runs. I'm currently running a .65 jet on the nitrous side and a .38 jet on the fuel side on a NX GM EFI wet kit. After I got back to the house maybe 5 minutes after the backfire, I took the lid, maf, and bellows off and I found a little bit of fuel puddled in the bellows.
I just recently put a Racetronix fuel pump in and got the car re-tuned for nitrous. I'm running 12.4:1 AFR and 24 degrees of total timing at WOT and TR6 plugs. The nozzle is not pointing straight into the TB and is a little canted in the bellows. Could that be my problem? Should I back down the fuel jet or leave it where it's at? Any advice would help.

 

TTT pondering a similar kit myself!

 

smooth bellows ?, and you want no restriction with the spray, get that puppy pointed where it needs to be before you aren't as lucky, I assume you have a fire extinguisher in your car..

 

i am considering the same kit. Hmm, that sucks man. Bad luck. Hope everything works out. What shot was it? I havent memorized my jet sizes yet.

 

spray that sucker straight into the tb, so it isn't bouncing the spray around. I have my nozzle at 8 o'clock position and spraying right into the the tb, no problems with the nx kit here

 

I'm guessing it's about a 170 shot or so. I have the nozzle at the 3' o clock position. I'm going to make sure it's straight and then back off both jet sides. Probably come down to a 100 shot and go from there.

 

That jetting is very close to a 150 shot. You need to fix the nozzle position if there is fuel in the bellow. Point it straight back at ther TB blade.

I never had a problem running that same kit and I ran 150 shot.