dennisbernal91z

iTrader: (2)

I have a carb set and a simple NX system. It is wired with a relay and a microswitch. It also has a fuel pressure saftey switch.

I am just wondering, when you hit the N20, is it supposed to come out in spurts? Like spitting real fast, kinda sounds like a little machine gun.

I wanted to test the solenoids, so I detached them from the plate and ran the lines into bags. And I observed what I started above. I figure if it supposed to stay on constantly I must have the saftey switch set to high and it is tuning off the solenoids as the pressure drops due to the initial impact of the N20 fuel solenoid turning on.



Also if you plan on using N20, you need to step down to a colder plug right?

Thanks for the help

Smokin87TA

iTrader: (2)

Most people will set the fuel pressure switch about 5 psi below their actual fuel pressure, but that is on fuel injection. If it is making noise then the solenoid must be opening and closing. I would try setting it down a little more but then i might look into running an aftermarket pump which would be a good idea anyway.

For plugs depending on how much you plan on spraying usually one step colder or 2. And back out about 2 degrees of timing for each 50 hp increase, just to be on the safe side.

dennisbernal91z

iTrader: (2)

yeah, everything on the car is aftermarket.

It is a fully forged 385, hydrolic roller motor. 500HP 495TQ motor. It has a big Holly volumax pump that supplies 250 GPH. I have more than enough fuel flowing. I run the carb at 7.5 psi. I have the N20 fuel set to 10 psi I think... crap might be 5... wow I feel retarted. I have never used it and the car is not done, so that is why it is not in my mind yet. either way, I know the solenoid works and so on. I got fuel pumping out as well as N20. I am just curiouse if it is supposed to come out in pumps or just one long PSHHHHH.. till you take your foot off? Thanks

Smokin87TA

iTrader: (2)

should be consistant one long PHSSSSS. it should be like opening the bottle with nitrous in it.

brodyscamaro

Yah that **** shouldn't be like a heartbeat...

dennisbernal91z

iTrader: (2)

Oh ok, I must have my saftey pressure switch set too high. It is tripping just when the pressure drops a bit from the set amount. I think if I just back it off a bit, it should be OK. If this doesn't fix it.... I will be back and very confused. thanks.

zuber187

I am no expert but if the fuel or nitrous is fluttering out of the plate and your noids are open I would suspect line routing or air in the lines. Correct me if I am wrong but If it was the FPSS wouldn't you would hear the noids clicking off when your testing it? Just a suggestion.

dennisbernal91z

iTrader: (2)

They are clicking off and on. I just didn't know if they were supposed to. I guess they are not supposed to. There is def no air in the lines, right before testing I used my purge valve and did a HUGE purge. And the bottle had just been filled. As for the fuel, my pump flows 250 GPH and I am tapping into the feed line for the carbs regualator. There is a lot of fuel flowing on demand. I am pretty sure I just need to adjust the FPSS. It is just set wrong. Thats all.

zuber187

10-4

Sounds like you have one hell of a setup. Good Luck.

brodyscamaro

FPSS are not as accurate or quick as you think. I've heard instrumentation guys (who also know a lot about nitrous) call them worthless...

dennisbernal91z

iTrader: (2)

Well mine seems to be acting just fine. The instant that the pressure drops off, the soleniods are killed. Simple as that. Maybe they had cheap ones or something. Either way, I really don't need it, this is a 100% street car. I just put it in, cuz it is the most "correct" way yo install a system. Thats all.

superramvette

Most NX systems require 10 PSi of fuel pressure, the fuel pressure cutoff switch should be adjusted to allow it to fall to 8 PSI because normally when u first hit it it will dip slightly then raise back up. I had to play with mine to get it right. However if urs is doing it sitting in the garage u may have a fuel delivery problem. I had a walbro 200 or 250 LPH pump with a regulator and it did not supply enough fuel for a 200 shot plus the motor. I eventually went with a holley black pump and the walbro.....Most of the time the cutoff wont kick in till 3rd gear when the demand for fuel is the greatest. If urs is doing it in the garage it will be worse on the street.

dennisbernal91z

iTrader: (2)

Thanks for the heads up. Pretty sure the saftey switch is just set wrong. If I adjust it and set the fuel pressure again, and it still happens, I will get a different regulator. My fuel pump is def not the problem. It is a borderline race pump that flows a TON. I have all 8-AN lines and highflow filters coming from my fuel cell. It flows 250 GPH. It is a Holly Volumax pump