OK, Im gonna do my best to not make this crazy long but Im going to try to exlpain as best I can. Alright, I have a TNT F1 kit that I installed on my TA and can not get it to work properely. This is what it is doing. With the system armed it will only fire the fuel noid. This is everything I have checked so far. First I have checked voltage to each noid and they both are getting a steady 11.5, this is with the battery only and grounding the relay to make them both fire. Im using a tps/wot box from nitrous outlet. It seems to be working cause it is sending the ground signal to the relay to make them fire but for some damn reason only the fuel noid will fire. The logic in the box is working cause I have it set at 3k and WOT and that is when I go pig rich from all the fuel. Another thing I tried just to see what would happen is I took the fuel noid out of the equation and only had the power wire off the n20 noid to the relay and bam, it sprayed. Both power wires are crimped together I dont understand how only the fuel noid is getting power. I understand the fuel noid is going to draw less current and volts but both wire are crimped together so power should be going through both?? So the only thing I could think of is that its not getting enough power for both. Talking to Dave at nitrous outlet, very helpfull guy by the way. He said the same thing. Well today I put a 10 gauge from the batt right to the relay making sure it way enough size of wire and it was also not even that long so I am sure the relay is getting enough power. Well I went to go try it out and again I only spray fuel. I cant figure this out and if anyone has an idea or something I should try please let me know cause I am stumped. Talking to Dave he wants me to send in the box to have it tested...is it possible that is the problem, I mean its sending the ground signal to the relay but everything else is wired properley and it just doesnt make sense at all why its not working.

 

I had the same thing happen to me before. Where are your noids grounded? If its not a good spot, only the fuel noid fires since it requires much less current.

Try a jumper wire from the solenoid ground wires over to the neg post on the battery and fire them again.
Good luck,
Vinny

 

If your running a fpss ive heard that the ground isnt that strong and can cause there only to be enough of a ground for the fuel. The n2o solenoid pulls alot more current. I have the same problem with my tnt right after i added a standalone and a fpss. Havent tried dissconnecting the fpss because cylinder7 is getting weak so i stopped spraying. Hope this help, keeps us posted.

 

If grounds are good, I would pull apart the nitrous solenoid and see if there is any crap in there. If it looks good I would say you have a faulty new nitrous solenoid.

 

well I have already swaped the n20 noid to rule that out and it does the same thing. Im not running a fpss and I have tried three different grounds. One thing I have not tried is using the negative side of the batt as a ground, I will try that...other then that it seems I have tried everything. Right now I have all three (purge, fuel and n20 noid) grounded to the passenger side post. The thing I dont get is why when I ground the relay I can make both noids fire, also if I take both + wires to the + side of the batt they BOTH fire...why would they both fire like that but not when I am armed.