Nitrous jetting using a fogger nozzle HELP
 

Hello, what jetting should i use in a fogger nozzle for a 50 hp shot?

i need the nitrous/fuel jet sizes.

also, its for a 4 cylinder 2.3 L
i'm not sure if the jetting is the same or not.


regards.

If it's a wet system, a 35 N2O and 22 fuel is a good place to start. This will give you a very safe rich setting. If you're not detonating, go down to a 20 fuel.

i found a website just now... http://www.schnitzracing.com/manuals/NOSChart.pdf

and it shows that you need an 18/22 jetting for 48 hp for use with a fogger nozzle, do you know of any other charts that i may compare this one to?



regards, Steve.

Sorry, I didn't realize you had a carb!!

The numbers I gave you were for a 43psi fuel injected system :(

They're showing a 40 N2O and 44 fuel for 50hp on 5-7psi fuel pressure on the site you mentioned. This will give you around 55hp at a 10 to 1 air/fuel ratio at 5psi

Wait, i am using efi !!!! i even have an MSD efi inline pump to hook up ......


what should i do now ?

Hey FordFasteR ,

If your'e running EFI, then the orginal numbers I gave you are good, 35/22.

I've been doing a LOT of reading recently..... i've found about 3 different jetting charts... it seems like the jetting for a fogger system is meant to be divided equally among multiple fogger nozzles on the engine used...


so hp numbers go up if you add cylinders...


so far, i've deduced that i can use the jetting for a 50 shot single fogger nozzle and it would be roughly between 36-40 for the n2o jet, and 44-46 for the fuel jet on a 5-6 psi setup... now since i wont be backing out any timing on this motor, i would leave it on the rich side... instead of leaning it down to a smaller jetting even though i'm running a high pressure efi fuel pump...

the actual jets that i have to work with will be a 38 n2o and a 46 fuel...
what do you think about that jetting combo? again, this is on a bone stock motor with cast pistons and an auto tranny, stock exhaust.

Hey FordFasteR,

a 38/46 combination is VERY rich. It will give you around 8 to 1 air/fuel ratio and high 40s in the HP area.

Once you do a few runs, I would try leaning it out a bit. A 41 fuel will up the mixture to a 10/1 ratio on 5psi. Also make sure you have a bottle heater. You need to keep bottle pressure at a constant 1000psi. If it's less than that, you will run richer and might even bog.

Thanks alot, your reply seems to be right along with the information i've gathered from websites and a book i have...


i'll try the jetting as rich as possible first, then i'll work my way down..

well, thanks alot !!!


regards.
Steve.

I GOT THIS CHART FROM NOS TECH SUPPORT today in the mail...

34/18 40HP
37/22 50HP
39/24 60HP
41/26 70HP
43/28 80HP
46/30 100HP
52/33 125HP
61/38 150HP (max for 1 nozzle)

he also mentioned that if i use a fogger nozzle, i will not have to raise the fuel pressure at the regulator.. thats good, since i wont want to worry about locking up my injectors at 80 psi ! hahaha


i called the local speed shop, and asked for the fuel jets i needed, the closest one they had in stock is the # 26... so i'll use that to start with, i figure the 46 i have is WAAYYYY too big...

anyhow, on with my nitrous dreams.

Just to give you an idea of what I'm using:

46/28 = 75hp
57/33 = 125hp

An easy way to tell how much HP You're using: 100hp = 1lb in 10 seconds, or 0.1lb/sec.

I use 0.20lbs/second, which gives me 200hp. I have a timer which goes on when the bottle turns on, and I always weigh the bottle after runs at the track.

I would not trust some of those numbers. On the one hand, they're telling you that a 46 N2O jet gives you twice the HP of a 37 jet, when the 46 jet is only 53% larger in area, while on the other hand they're also saying that a 61 jet flows only 50% more than a 46 jet, yet it's 75% larger in area than the 46 jet. That's total bull.

If you really want to know for sure, put your bottle on an accurate scale, attach the nozzle to it and open her up for 10 seconds. Take the weight in pounds that it used up and multiply by 100. This will give you the actual HP you'll get with that jet and the proper fuel jet.

you are right.

but it is close... also, that chart was sent to me by the people who determined those numbers with hundreds of actual engine dyno tests... (i hope) hahahaha



FORD !

check out my new website...

and the link is http://www.pcrepairworld.com/nitrousworld