I am in the middle of installing a n2o fuel system and I would like some opinions on wether I should go with a high pressure 40+psi or low pressure fuel system 5-10psi. I would rather go with the high pressure b/c I think it's better for atomization, I already have quite a few jets and a few tuneups for 150-200HP and little changes in pressure don't make as much difference as in low pressure systems like pressure changes do in 5-7psi systems. I already have a high pressure pump, tank and lines so I only need a high pressure reg to finish it up. Also on the return line is it neccessary to put a jet in the line to slow down the return flow? TIA Later Clint

 

The nitrous does the atomizing not the fuel pressure. If it were me I would go low pressure holley blue pump and a 1 gallon cell up front would support more power than you would ever add with nitrous. But if you already have all the stuff for the high pressure set up then it may make more finacial sense to use it. I've just found that tunning a low pressure system to be easier since you can do a lot of the tunning with the fuel pressure as opposed to the jets.

 

clint,
I just got done installing a holley blue pump(14 psi max) I welded a sump to the tank and ran a relay into the nitrous system. When I arm my nitrous the pump turns on. I did buy a non-returnable regulator. I have a regulator and a gauge ( 0-15psi) mounted in the car oposite side of where the spare tire would be. All the parts I needed cost about $600 through Jeg's. I'm running a nx dp kit jetted for a 200 shot. I did it because I would get a terrible lean speak, and hopefully this will cure it. I'll try to post some pics.
chris

 

I sent pics to your hotmail address
chris

 

Thanks guys. I am still leaning towards the high pressure b/c I have most of the parts and I am very familar with the jetting. I am installing the second stage to my n2o setup so I can leave on 100-150HP and turn on another 100-150HP depnding on track conditions and wether I have drag radials or slicks. I don't plan on spraying over 275HP total. I also like the seperate n2o tank so I can run pumpgas in the fuel tank and C16 in the n2o tank. Later Clint

 

Clint,

I have had both low and high pressure systems and the low seems to work better. Much easier to tune with and is more susceptible to jet changes. A high pressure system jets can clog up easier than the low pressure. I will never go back to a high pressure system.

 

Well it would be easier to do a low pressure setup b/c I wouldn't need an expensive fuel pressure regulator and the Holley pumps are cheap. Would I need to run a return with the low pressure setup? How much pressure are you guys running and where can I find the jetting for low pressure? LMK Later Clint

 

Robie the robot has a good calculator to determine what jets you would need then you can get the jets amost anywhere...

 

Typically around 9 psi works well. Contact Dave at Nitrous Outlet and he can give you jet sizes. You do not have to run a return but I would if I were you.

 

I have a low pressure setup in my car. I have a Jaz fuel cell up front with a holley black pump, holley regulator and lines. It is setup up as a dead headed system with a return line. (Kind of an oxy moron, but it's not a true return regulator).

I use a jet in my return line to keep pressure up while allowing for air to bleed out. If you search this section there is a good post about how to setup the system for flowing fuel pressure with the jet in the return line.