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Nos jet sizes.

Nitrous Discuss dry, wet, and direct port nitrous setups. How many shots can you handle?

Nos jet sizes.

Old 09-21-2007, 01:24 PM
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Nos jet sizes.

Hey guys,

I have a wet setup just waiting to go in my car. The only thing I need are the little jets for the fuel and nitrous. Can someone tell me what size I should be using on my 00 for a 50 and 75 shot?

I have used the online calculators and gotten slightly different combos, so I figured I'd ask what you guys are using.

DF
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Old 09-22-2007, 07:12 PM
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If NOS made the kit, look on their website or call them for the recommended jets. It's different for every kit.

Last edited by Aaron92SE; 09-22-2007 at 07:14 PM.
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Old 09-23-2007, 07:15 AM
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Thanks guys, I didn't even think to call them.
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Old 09-25-2007, 09:56 AM
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41-N
26-F = 75 HP FOR NOS SET UP
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Old 09-25-2007, 11:26 AM
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nx was 41/24 for a 75.
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Old 09-25-2007, 01:13 PM
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Originally Posted by absoundlab View Post
thats wrong

nos wet 75 hp jets

n2o - 36

fuel - 24
thats a 70 shot i have the list right in front of me, i have been running these for yrs. also it's based off your fuel pressure at wot and at 43psi the numbers i gave are correct.
if not call and see for yourself 714 546 0592 nos tech support.
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Old 09-28-2007, 10:59 AM
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Originally Posted by absoundlab View Post
once again I will repeat myself C MAX you are wrong.

I just called nos and 43 - 48 psi at wot is :

F - 24

N - 36
lol, stop lying. give me the tech supports name
41
26 = 75 hp

i just got off the phone with them. been dealing with them since 1998. the thread starter should call his self and prove you wrong.
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Old 10-02-2007, 09:15 AM
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Ok guys, calm down.

Just gave that number a call (sorry I haven't checked on this thread in DEEP).

50shot:
30N 22F

75shot:
36N 24F

Told him it was a 3.0 v6 with 43psi for fuel pressure.

DF
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Old 05-02-2013, 04:49 AM
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lmfao..thats funny.
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Old 05-02-2013, 06:51 AM
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Just a couple of comments on nitrous jetting.... for one, NOS-format and NX-format jets are mechanically different, and not interchangeable on most nozzles. Second: the advertised shot levels are sometimes referring to crank HP or to wheel HP ( WHP), depending on vendor. These two things can cause different jet sizes to be listed for a given shot-level. For me, the 41N/24F jet combo gives an actual 75 WHP on a dyno. Smaller jet combinations will not make 75 WHP.

I have a lot of NX experience over the years, including chassis dynos, and I have always found the NX jetting to be correct on the dyno, for actual WHP. I have never used the NOS jetting charts - better the devil you know, right? I have used the NX jetting sizes in NOS-format nozzles and the WHP matches the NX charts, which makes sense because the hole in the jet is supposed to be the same size in any jet.

NX web site jets for import EFI engines:

http://www.nitrousexpress.com/oldweb...tcompact09.pdf

Hope this info is helpful....
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Old 06-24-2013, 09:29 PM
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I'm runnin NX kit and using a 41N and 33fuel jets cause i was show little detonation with 24f jet.

I'm still experienceing with it all but i read on a 350z fourm NX jet was 48N and 28F for 75 shot and when i ran that combo **** hit HARDD then i found MY nx chart paper n said 75 was 41n 24f..so why does different ppl have different jetting charts for same kit?
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Old 06-25-2013, 07:17 AM
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Originally Posted by TravisCadello View Post
I'm runnin NX kit and using a 41N and 33fuel jets cause i was show little detonation with 24f jet.

I'm still experienceing with it all but i read on a 350z fourm NX jet was 48N and 28F for 75 shot and when i ran that combo **** hit HARDD then i found MY nx chart paper n said 75 was 41n 24f..so why does different ppl have different jetting charts for same kit?
Because they're wrong... see NX reference above. 41N/24F is correct for gasoline to make 75WHP. For E85, it's 41N/33E. Tested by me... If you have detonation at that low level of nitrous, then you have a problem. Too rich is just as bad as too lean. Learn to read your plugs - your copper-core plugs.

Other vendors may have different jet recommendiations, but you never know why - maybe it's for crank HP, like NOS used to do, or they tested on just a lame engine or fuel pressure was wacko.
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Old 06-25-2013, 07:58 AM
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Safer to be rich then lean correct? that's really why i put fuel jet up.
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Old 06-25-2013, 08:35 AM
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Originally Posted by TravisCadello View Post
Safer to be rich then lean correct? that's really why i put fuel jet up.
Please read.
Originally Posted by grey99max View Post
Too rich is just as bad as too lean.
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Old 06-25-2013, 06:41 PM
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Originally Posted by TravisCadello View Post
Safer to be rich then lean correct? that's really why i put fuel jet up.

Really, if you don't use a good A/F meter and FP gauge, it's much better to stick with the NX jet sizes - and learn to read fresh plugs. A 75-shot doesn't need colder plugs, but it can't hurt. Too rich is just as dangerous as too lean.

Here's a really old dyno graph of my previous 3.5 with only S1 cams, headers, and rod bolts, using OEM ECU because the timing is good for nitrous at WOT. Not advanced for better NA numbers, since I don't care about NA WHP.

All jetting was NX standard specs, and I used two Shark nozzles just before the TB. Dyno HP increases were very close to the advertised NX WHP, as you can see.

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Old 06-25-2013, 11:24 PM
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Nice. well when i use 75shot it honestly is pretty weak feeling but maybe cause my fuel jets too much? 41n 33F...when i ran a 46N 28F it was makin some solid power then felt NICE but guy at performance shop said my plugs were Great jus had tad bit of detonation and to up fuel jet to 30 but all i had was a 33f jet.


should i not be sprayin above a 75 with the stock restricted y pipe n exhaust @ 214k miles? maybe that's why my 75shot feels like a 40shot?


also my timing is advanced 2degree but guy told me that don't effect our timing curve at wot only base timing so idk if i should retard it or jus go bac to stock 15.
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Old 06-26-2013, 01:53 PM
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Originally Posted by TravisCadello View Post
Nice. well when i use 75shot it honestly is pretty weak feeling but maybe cause my fuel jets too much? 41n 33F...when i ran a 46N 28F it was makin some solid power then felt NICE but guy at performance shop said my plugs were Great jus had tad bit of detonation and to up fuel jet to 30 but all i had was a 33f jet.

should i not be sprayin above a 75 with the stock restricted y pipe n exhaust @ 214k miles? maybe that's why my 75shot feels like a 40shot?

also my timing is advanced 2degree but guy told me that don't effect our timing curve at wot only base timing so idk if i should retard it or jus go bac to stock 15.
Any ignition advance with nitrous can be fatal to your motor. The stock 4th gen ignition curve at WOT goes up kinda high at higher RPMs. It's close to the edge for detonation. A true 75-shot will nail you back against the seat if you are using OFF-ON solenoids. Stock exhaust is really gonna slow you down, since burning nitrous produces a lot more exhaust gas when spraying. If your plugs were "Great jus had tad bit of detonation" then you were close to engine damage. The exhaust valves burn off first, then you can burn thru a piston and make loud bangs from the intake - that's fun. When you "up the shot" you would be amazed on how fast your engine breaks. Been there, done that.
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Old 06-26-2013, 08:10 PM
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Yeah haven't sprayed since been babying her until i get a wideband and dyno tune. not worth guess work!


Thanks for info bro.
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Old 06-26-2013, 09:03 PM
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Originally Posted by TravisCadello View Post
Yeah haven't sprayed since I just read what you said. Been babying her until i get a wideband and dyno tune..even though I don't have any engine management hardware and no idea how to tune by tape. All I'm doing is guessing!

Thanks for info bro.
....
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Old 06-26-2013, 09:22 PM
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Tune by tape? no guy i been tuning by reading spark plugs.


So the 17degree timing is base timing meaning after 2k rpm I'm still in a stock timing curve correct?


how do we retard the timing curve? and wouldn't our knock sensor pickup detonation and automaticly retard timing while sprayin?
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Old 06-26-2013, 09:32 PM
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Here's some good info so i guess next time i spray ill disconect my knock sensor and see how it does.

https://maxima.org/showthread.php?t=170454
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