fuel pressure saftey switch?

[cyrez187]

i have a fuel pressure saftey switch do i really need it or do u think ill be fine running a dry 50 shot without it?
and is it easy to install and what exactly does it do? i wanted to make my nitrous turn off when i hit a certain rpm!!

 

[Colossus]

Zex and NX controllers shut off automatically if your fuel pressure drops to low.

As for shutting it off at a certain RPM, take a look around this forum....I can't remember which thread it was...but in one of these past few, they discussed a switch to shut it off at a certain RPM.

 

[cyrez187]

ok but whats does the fuel pressure saftey switch do?
do i need to install it before hitting my nitrous? some guys say u dont really need it

 

[DSMJim]

Nitrous kits without the fuel pressure safty switch do not shut off automatically if pressure drops low. The kit is mechanical, if you have it armed and are at wot, it's on. This is what the switch is for, but if you don't use it then it doens't stop anything.

The fuel pressure safty switch is exactly what it sounds like. You install in inline with your fuel line. Its a diaphram that when enough pressure is applied completes a circut, in this case ground for your solenoids so they will open. You wire your ground for your solenoids through the switch. When there is no fuel pressure it breaks ground so your nitrous kit does not operate. Thats how it stops your nitrous kit from spraying if fuel pressure drops below what the switch is set for. Generally they are 35psi. They are more or less designed so you cant spray your car when the motor is not running, however 35psi is acheived at idle so if you stepped on the gas a idle your fuel pressure will jump over 40psi and the nitrous kit will activate. That would be a bad thing at idle.

Basically if you know how to use a nitrous kit properly and only arm it when your at WOT so it comes on then you will have no problems with low fuel pressure. If your fuel pressure were to drop and go below what the switch is set for it would fry your motor long before the switch kicked off our nitrous. If you were at 6000rpm and your fuel pressure were to drop and that drop took 1 second and your nitrous kit shut off all in one second you would still have 100 full revolutions which is 25 power strokes before your nitrous kit got shut off all while you are at WOT in a super lean condition. You would likely blow it up, however there is a chance it may save it, but its small.

 

[cyrez187]

what does WOT mean

 

[Colossus]

I figured he realized it didnt work unless it was being used But, yeah.


WOT means Wide Open Throttle. Throttle open 100%

 

[1990EclipseGSX]

Did you ever think that if you don't know the simplest term such as "WOT," maybe nitrous isn't for you yet. How are you going to install the "W.O.T." switch to activate your nitrous in the first place when you don't know what W.O.T. means? My god....get on www.nitrousexpress.com and plow through the install guides. Here is the specific link for the fuel pressure safety shutoff switch http://www.nitrousexpress.com/Instructions/fpss.pdf You could have found out just as much about the fuel safety switch as you did right now, plus you could have learned how to wire it, how it works, and if you would have read through a few other guides you would know what W.O.T. means. Oh, and they will give you picture diagrams so you can see just how easy or hard it is to install for yourself. Also, I believe that fuel pressure safety shut off switches are mainly a good for idea for wet shots when you are actually siphoning off unregluated fuel, and you have a chance of sucking away to much fuel and not leaving enough fuel pressure for your injectors.... I don't believe it is as important or useful on a dry 50 shot, but I could see it's plausibility when running a large shot like 100+. And if you want to shut off your nitrous using rpm's you need to purchase a rpm activated window switch from MSD, NX, or NOS, and this will allow you to start spraying at a certain rpm and finish spraying at another with the use of small rpm specific chips. And NX kits don't have controllers to shut down due to low fuel pressure unless you invest in a GenX 1 or GenX2 upgrade pack, or you can just buy the hobbs shutoff switch by itself.

 

[cyrez187]

right now im running a dry kit, is it possible to change it to a wet kit?
cuz where my fozzle taps into my intake pipe it has to holes one for nitrous and one for fuel but im only using the nitrous one.

 

[DSMJim]

Originally posted by cyrez187
right now im running a dry kit, is it possible to change it to a wet kit?
cuz where my fozzle taps into my intake pipe it has to holes one for nitrous and one for fuel but im only using the nitrous one.

What??? A dry nitrous kit has a nozzle with only one hole in it. If your running a nitrous kit with a nozzle that has a connection for nitrous and fuel you have the system setup COMPETLY WRONG!!!

You can not setup a wet kit and make it run dry. If that is the case how are you adding extra fuel for the nitrous?

 

[1990EclipseGSX]

Again, my best advice is for you to hold off on the nitrous for a little while because you don't have the first idea what you are doing and you are just going to blow up your car. Your nozzle is for a wet kit....Which means you need a fuel selenoid, lines, etc. to make it work....You can't just plug into one of the holes for nitrous and leave the other one open.

 

[DSMJim]

Originally posted by 1990EclipseGSX
Again, my best advice is for you to hold off on the nitrous for a little while because you don't have the first idea what you are doing and you are just going to blow up your car. Your nozzle is for a wet kit....Which means you need a fuel selenoid, lines, etc. to make it work....You can't just plug into one of the holes for nitrous and leave the other one open.

1990EclipseGSX is competly correct. Take the nitrous kit off your car, sounds like you only have 50% of the parts you need and are missing a lot of stuff. Would you install a turbo charger without the intercooler pipes? Wheels without tires? Seats without rails to bolt them down? I'm sure you get the idea, your missing a lot of stuff and SHOULD ABSOLUTELY NOT RUN THAT KIT LIKE THAT. You can absolutely NOT run a wet kit without the fuel portion of it.

A dry nitrous kit does not just spray nitrous into the intake manifold and thats it. It has a piece that runs after a solenoid that applys pressure to your fuel pressure regulator to increase fuel pressure when your spraying. Nitrous its self does not give you HP it only allows your car to burn extra fuel which is where the extra hp comes from. HP only comes from burning more fuel, but to burn more fuel you need to draw in more air, well nitrous is that air which allows you to burn fuel. See the attached pic of my old dry kit on my GTI (before I switched to a direct port kit) Look at the attached pic you can see the two nitrous solenoiods and the fuel pressure increases inbetween them (blue). This is totally different then to how a wet kit works. They only use one solenoid for nitrouos instead of two because they dont increase fuel pressure, they uses fuel from the fuel line and spray it in with the jet. This is how your kit is supposed to be setup but you obviously are missing that part. Bad, very bad.

If you seriously don't understand what were talking about just remove the entire kit from your car and stop using it. You will blow up your car because it's set up completly wrong.

 

[cyrez187]

i have 1 nitrous solenoid, i dont see the purpose of 2?
ill get some pics posted asap thanks

 

[DSMJim]

Originally posted by cyrez187
i have 1 nitrous solenoid, i dont see the purpose of 2?
ill get some pics posted asap thanks

Because that is how a dry system works!! You DO NOT HAVE a dry system.

Your setup needs one solenoid for nitrous which comes from the bottle to the solenoid then to your nozzle. You also need one for fuel which comes from a T in the fuel line feed (before the rail after your fuel filter) goes to the solenoid then to the nozzle.

You will need the correct jetting for both to make sure you have the correct air/fuel ratio for your nitrous kit.

First off tell me what kind of kit you have and what parts your using.

 

[cyrez187]

so the fuel solenoid knows how much fuel to inject by itself?

 

[cyrez187]

k here is my current setup!!!
nitrous and purge solenoids see if this is right

You must be logged in to view this image or video.

 

[Colossus]

Maybe if I could see it a bit better?

But yeah, it's these kinds of situations where cars go boom.

 

[cyrez187]

ill see if i can get a better one

 

[cyrez187]

try this site and go to the bottom of the page might be a bigger pic
http://www.cardomain.com/memberpage/334616

just need to know if this is all hooked up right?

 

[cyrez187]

are u able to see that pic? just need to know if that setup is right?

 

[DSMJim]

are u able to see that pic? just need to know if that setup is right?

Uh yeah, your missing a whole bunch of stuff. Did you see the pic I posted above? That is what is required for a dry kit. It needs two solenoids and the fuel pressure riser (the blue thing) that you see above. Then a vac lines goes from the fuel pressure rised to a T fitting at the fuel pressure regulator and you use a nitrous jet (the brass things with the tiny hole in it) to control fuel pressure there. You have none of that stuff, so your kit is totally setup wrong and can not be run like that.

You can not spray nitrous without sometype of added fuel there is no possible way that will work.

A wet kit uses another solenoid and goes to the nozzle and you put another jet it in to control the amount of fuel your shooting. Lets say your using an NX kit just for comparison. You would use a .31 nitrous jet and .24 fuel jet for a 50hp shot. You must have some jets (the little brass things that go into the end of the nozzle) so you should know what they are.

Either way your missing a whole heep is stuff from that kit. Thats like trying to drive a car without a transmission and then asking me "well I don't see the need for a transmission" the same as you said you don't see the need for that second solenoid.

I highly recommend you take it to a shop that handles nitrous and order the missing parts or just remove the kit entirely because your missing so much stuff it's not even funny.

Hang on I'm gonna sell you an intake, but not give you a filter or any hose clamps. It will work right? Well yeah it will bolt on with no hose clamps or filter, but it will probablly blow up your motor because your missing some pretty important stuff (filter) that is exactly what your nitrous kit it.

 

[cyrez187]

ok so from the picture what am i missing? to make this kit wet all i need is a fuel solenoid?

 

[1990EclipseGSX]

A complete wet kit needs a fuel selenoid, a nitrous selenoid, lines for the nitrous and fuel selenoids, a nozzle with two outlets, proper jets for the nozzle to adjust the size of your shot, WOT or some kind of activation switch, and an arming switch, a power relay, and probably a bottle heater to make sure you are firing in the proper nitrous pressure range. From the sounds of it, you somehow ended up with half of a wet kit. Your best bet is to just go out and buy a complete new nitrous system, because from the sounds of it you are never going to get the setup you have to run without buying just about everything......I mean let's see, you have 1 selenoid, 1 nozzle with 2 outlets, and none of the other required components it seems. At least that is what your picture looks like. Buying a new setup with directions would save you a lot of headache and most likely your engine.
Chris

 

[cyrez187]

from what u said, i have everything except for the fuel solenoid!!
so im assuming the guy i bought the kit from got confused and sent me like half a wet kit or some shit???
why cant u just shoot like a 50 shot of just nitrous in your intake pipe?

 

[TargeT]

from what u said, i have everything except for the fuel solenoid!!
so im assuming the guy i bought the kit from got confused and sent me like half a wet kit or some shit???
why cant u just shoot like a 50 shot of just nitrous in your intake pipe?

I dont think you get what n20 is, its not magical go fast juice

when you spray N20, your increasing the useable air in your cylenders, you need to proportionaly increase the fuel to keep the correct A/F ratio (prevent runningtoo lean, or too rich etc..) by pushing more air(in this case N20) and more fuel (yes gas,,) you get more power,.. its kinda like using a turbo or not using a turbo..


so if you just spray a 50 shot of n20 into your intake, your not going to have enough fuel when your cylinders spark (unless you have a correctly set up dry/wett shot that puts the extra fuel in for you)

does that make sence? what your doing by "just spraying a 50 shot" is inducing a super lean condition which causes massive knock counts, and ultimately will blow your engine up.

 

[DSMJim]

why cant u just shoot like a 50 shot of just nitrous in your intake pipe?

Because spraying Nitrous alone into your intake will not give you extra HP. Nitrous does not give your car HP by it's self. It is compressed air which during combustion releases a lot of oxygen. When you have a lot more air being forced into the motor (kinda like a turbo) it allows you to burn more fuel. HP comes from burning GAS and no other way. THe more gas you can burn the more HP you make. The only way to burn more gas it to get more air into the engine. This is why large displacement motors make lots of HP because they can suck lots of air. This is why turbo cars make lots of HP because they get lots of air forced in. Regardless of how the air gets in, it ONLY allows more gas to be burned which allows more HP to be produced.

Shooting nitrous on it's own is no more effective than shooting peanut butter into your intake. Remember a dry kit uses that blue solenoid to bump up fuel pressure by 40psi. THe cylinders get the extra fuel from the injectors because the fuel pressure was just doubled so they are spraying more fuel in.

Nitrous is nothing more then air. Try and light some air on fire, now try and light a fart on fire and see what happens.