nitrous tuning 1jz

[Jasper]

Anybody here run nitrous besides Shane and Grant?

I do, two stage dry system on a 1UZ:

[jeffro ra28]

Apparently the thread these nozzles use is a special gast fitting so bolt shops or enzed don't have them

Are we talking about the JIC type fitting here? or the tapered 1/8 npt thread?

[chris davey]

jasper: thanks for the pics. I can't quite see in the pics but do you have any nuts on either side of the nozzle or just screwed into the pipe?

In the second pic, the fitting that is used to connect the female solenoid to the female line is the one I have to use some sealant on.

jeffro: I don't know what a JIC fitting is. I have read about this tapered 1/8th NPT thread in the zex instructions for the nozzle mounting though so it is probably that one.

[Jasper]

jasper: thanks for the pics. I can't quite see in the pics but do you have any nuts on either side of the nozzle or just screwed into the pipe?

In the second pic, the fitting that is used to connect the female solenoid to the female line is the one I have to use some sealant on.

jeffro: I don't know what a JIC fitting is. I have read about this tapered 1/8th NPT thread in the zex instructions for the nozzle mounting though so it is probably that one.

Nozzles are threaded straight into the intake pipe, no nuts.

In the second pic, there is loctite teflon thread sealant (very small amount!) on the NPT theaded fitting going into the solenoid.

JIC fittings are the tapered ones you use to connect the flexible line from the bottle. There is one sticking up in the second pic, but it has a dust cap on it so you can't see the taper.

[chris davey]

thanks mate.

You don't get any leaks with the nozzle mounted like that? I was thinking that there isn't a whole lot of thickness in the pipe (like mine) so not much thread.

So the fittings that are on the bottle are JIC and the fittings on the nozzle end are tapered.

[Jasper]

Its a tapered ally thread tightened into stainless, so it seals up fine. There is no pressure differential across that join anyway in an NA motor.

I have a fitting for the bottle which has a 7/16 JIC male outlet.

The fittings on the nozzle are a different type, the jet is sandwiched between the nozzle and the female flare on the end of the hardline, forming a taper seal.

[ReQuieM]

Hey chris, My throttle body has two bungs welded on for either NOS of extra injectors (I think from injectors) If you want I could sell you it? I don't need or use either ATM so its just sitting then doing nothing. PM me if you like...

[mtp_69_i]

on the topic of tuning NOS injection and purely for interests sake. How much effect does the O2 sensor have on tuning of a NOS system? Is it necessary to use an aftermarket O2 sensor?

[Jasper]

I use a techedge wideband hooked up to my Autronic for tuning.

[chris davey]

I also use a techedge wideband hooked to microtech. Wouldn't leave home without it

[chris davey]

Just been finishing off install. Have nitrous line to solenoid, solenoid to jet. Have fuel inlet line t pieced off and the line goes into the fuel solenoid. Then I have a solid metal line with flared ends and -3 AN fittings. As soon as I activate it fuel leaks from between the solenoid fitting and the -3 fitting. We swapped ends and it still leaked. That end doesn't have the jet on it. (The flares located fine on the output of the solenoid)

So I was going to get some new fittings I think but I have no idea why these ones don't work? AFAIK the guy who I bought the kit off was using them.

found a pic
red fittings


There is a tiny crack on the outside of one of the flare caps. But I don't know if it is affecting it as the one without the crack still leaked. This is only at idle fuel pressure of 38psi or so.

[chris davey]

Just got this

Hello Chris,
Please note our #56 flare cap is manufactured in brass. Our flare fittings
are SAE flare not JIC which you probably require.
Kind regards,

http://www.endoe.com.au/default.asp?p=PG&cri=40

I have no idea what the difference is in flares. I don't particuarly won't to go and research shitloads about fluid coupling just so that I can get a non leaking fuel line. If I get a piece of 3/8" pipe, double flare it can I use a SAE flare fitting like these guys sell?

[chris davey]

Found some good info.


It is important to distinguish the difference between an AN/JIC flare and a typical compression flare. While the look similar, the two hard lines have different flare angles. Left is a 37° flare used for AN/JIC, while right is 45°.


Using a 45° flared hardline on an -AN fittings will result in leaks. The paint pattern here shows incomplete contact between the male and female ends.


Here we see the result of a proper seal between the AN fitting and 37 degree hard tube flare. This seal will not leak and requires no sealant or Teflon tape to work.

Mechanic says he can do the 45deg SAE flares so if I can check that the SAE -3 thread is the same as the AN/JIC -3 thread then I can just get some 45deg SAE fittings and make a new pipe.

(so much for not learning all about this shit )

[thechuckster]

chris - unless that intercooler pipe is very rigidly mounted, i'd change the short fuel line section to flexible hose - otherwise every hard run, you'll introduce bends and fractures at both seals

[chris davey]

I ended up using the same line as the one on the nitrous line and moved the solenoid and it now has no leaks

Next question. I read that to check for leaks in the nitrous line you should be able to see condensation or a mist because of the cold. I can do this up until the solenoid but seeing as how you aren't supposed to inject the nitrous until 3000rpm how can you check it other than on the dyno?