NX vs NOS

These are my feelings and experiences after installing and running both systems on my Maxima.

Install is pretty much the same. Run the nitrous line, install the bottle mounts etc. The relay is pretty much the same, same number of wires and very simple to hookup.
A tee is required in the fuel line for the wet kit to run to the fuel solenoid, but you need to tap into the fuel line for the fuel cutoff switch and gauge if you have one for a dry kit so no extra work involved. They both utilize 2 solenoids but there is no nitrous pressure regulator or vacuum tee hookup with NX so their setup actually has less components.

The same number of jets are required (2) but NX gives you exact nozzle sizes for nitrous and fuel for you car to achieve the correct O2 reading so no tuning is required. This is done by bench testing for each given fuel pressure. The WOT fuel pressure is a constant on the wet setup because it uses stock fuel pressure.

The Warranty and Technical Service is second to none with NX. The solenoids have a lifetime warranty and they will even check and rebuild your solenoids if necessary if you send them in, for the cost of postage. They are also large enough to handle 300 HP so they are heavy duty.

The nitrous pickup tube on the NOS bottle angles from the center of the bottle to the bottom. The pickup for NX goes straight down the center until its 2 ½ “ from the bottom then it angles on a 45 to the bottom of the bottle. This allows the end of the pickup tube to be just that much closer to the bottom of the bottle so it runs out of liquid later.

The rating of the NOS system is in crank HP. The rating of the NX system is in wheel HP and is guaranteed to be accurate within 2%.

The nozzle of the NX system guarantees 100% atomization of the fuel before going into the intake so no puddling etc like NOS. Actually NOS created puddling from the inefficiency of their nozzle that’s why they say in their manual, wet systems are prone to poor mixture distribution and fuel puddling causing backfires.

Purge solenoids for NOS systems are before the nitrous solenoid so there is still a bit of warm nitrous in the nitrous solenoid itself. NX has a purge solenoid connection on the other side of the main nitrous solenoid so the nitrous has to flow through the main solenoid before it gets to the purge, therefore it has cold liquid nitrous right at the valve. This is a very small item but shows that NX examines even the smallest design details.

The bottle heaters from NOS are controlled by the temp of the bottle with no regard to pressure, their theory is that 85 deg is the proper temp to get optimum pressure at all bottle levels. NX controls by monitoring the pressure in the bottle and it keeps the pressure between 1000-1050 psi.

These are the main differences:

Nitrous Express
Plumbed, wired and jetted by you. Stock pump and injectors are typically fine.

NOS
Uses the stock fuel delivery, via raising the fuel pressure by tricking the regulator. Must have good quality fuel injectors that won’t fail on high pressure and must have a fuel pump that can supply the required pressure.

Tuning

Nitrous Express
No turning required, just install the correct jets for the HP you want, either from the chart or call NX and give them your vehicle fuel pressure and they will give you the required nitrous and fuel jet size for the shot you want.

NOS
This is done by adjusting the “fuel” and nitrous jets, the “fuel” jet actually being a jet that connects to the fuel pressure regulator to raise and lower fuel pressure. My experience is that most vehicles use a different fuel jet that can only be determined by experimenting.

Spark Plugs

Generally you want to use copper spark plugs as opposed to the stock platinum ones. You also want to reduce the gap from the stock 0.044". I've received a couple of notes on why you use a smaller gap. "The reason you want a smaller gap is because of ionization. If you change from the typical air (78%nitrogen, 21% oxygen)/fuel ratio, a given gap requires more energy to ionize the mixture, resulting in less energy in the spark, if you even get a spark." and also this message: "The reason that you close the gap on your spark plugs is because when nitrous is added, it raises the cylinder pressure, much like a supercharger, therefore "blowing" the spark out. When you close the gap it cannot put out the spark as easily." Copper Plugs are used because of the larger electrode which makes a fatter spark as opposed to the much thinner Platinum electrode.

Conclusion
As you can guess I am pro NX now because of my experience. I am only brand loyal until a better one comes along and I can see the benefits.
The bottom line is that most Max owners could run a 75 shot NX without doing any fuel upgrades like with the NOS system. A 75 shot NX reduces my ¼ mile time from 15.7 to 13.6 with no other changes.

PS I have seen the NX kit listed for as low as $480 so price difference in not that great.

 

Jime thats awsome information.
I am ordering my NX kit tomorrow based on the information you have given to this forum on the subject.
I will keep it at a 75 shot for a while until I get used to it then who knows..

again..ty for all the information you have provided me

- Michel

 

I have to give Jime credit also due to his posts i also have purchased the NX kit instead of the NOS one i will be installing the kit as soon as i can but do to the current weather changing in CT i think i am going to wait till the spring to do so. Thanks Brian

 

Wow, nice writeup.

So is the NX kit adjustable in any way?

(I'm boosted, and don't really want to run over a 40 shot if I get N02)

IanS

 

You can adjust the jet sizes if you want to, but I have run every shot from 35 HP to 150 using NX recommended jetting and have had no problems so I wouldn't suggest tuning if thats what you are saying.

The beauty of the NX kit is that you don't have to tune because the fuel pressure remains constant unlike NOS.

Jim

 

That's one of the most comprehensive and convincing writeups i've seen.

BTW, are you running a 150shot right now? Wow.

 

Nice write up Jim. What are the price differences?

 

Doh! Should have went with nitrous instead.


Nice writeup Jime.

 

Good write up Jime make me want to spray a 35 or 40 shot specially since you said the jet is adjustable, just need to cool the air a bit thats the reason I d be using it!!

 

Nice info !!! Very unbiased, but convincing information. See, posts from real adults like Jime are very constructive. Nothing like
"NX is da shiiit man.. Get yours now dude!!". LOL

I got my NOS kit for only $375, so I'm a happy camper!
For the NX kit, do you have to drill into the intake manifolds? Guys like 1max2nv and jaimecbr900 have these wet kits, and they need to get 12 new jets to change the HP settings. Is that a different kind of wet kit than the NX? As you can see, I dont know much about wet kits.. but I'm totally sold on the NX !!

I would like to see a pic of engine bay with the NX kits.. any pics Jime?

 

The kit Jime has is different than what is being used by Jamie and 1max2nv.

They are using a Direct Port kit. Nitrous and fuel are combined directly in the fuel rail. It is more involved to install, tapping into the manifold is required etc. etc.

The concept of Jime's kit is similar to NOS #5124. It is a single fogger With this NX kit, fuel and nitrous are combined and sprayed into the intake before the throttle body. The NX nozzle atomizes the fuel and nitrous. The NX kit does not require as much tuning and generally you don't need an FPR or an upgraded fuel pump unless you are running a higher shot, 75 or greater.

The danger with the type of wet kit used by Jime, according to NOS, is that fuel and nitrous can possibly puddle in the intake manifold and cause a backfire.

I have not found any examples of this happening. I have been investigating all three kits since I sold you the NOS kit 5124.

Hope this helps!

Dave in YOrk

 

im pretty sure jaimecbr had direct port injection....

nice writeup....for $500, i can be in the 13's (granted some new tires)

 

I am by no means an expert on this...but I thought that the problem with a single fogger wet kit is not only the puddling (which was stated is not a problem) but the fact that on our cars with the long intake runners that cylinders 5 and 6 tend to run lean, because most of the fuel goes to the first few cylinders. Intake manifolds are not made to flow fuel, just air. I thought that is why most people that get a wet kit for the maxima use direct port, so each runner gets the required fuel for sure. I am not flaming just trying to fully understand this better, just in case I do this one day.

 

I have heard the long intake runner story as well but I believe its very similar to the puddling, it was created by NOS so people would buy their kits because they weren't able to design a safe wet system.

I don't know of anyone that has had problems with an NX kit, if anyone has speak up.

 

But, when nitrous and fuel are being supplied by the same nozzle, this is not a problem. If the flow is lower for those last cylinders, that's ok. They may not get as much fuel, but, since the nitrous and the fuel are atomized togehter, they get less nitrous too. Less fuel + less nitrous = no lean condition.

 

Thats what I thought. I now believe the NX = blow your engine is a conspiracy of NOS. If anyone is getting nitrous, I'm gonna be recommending NX kit !

And thanks for the explanation dilicari! And thanks again for selling me the kit. haha

 

excelent writeup! sounds like the only other thing that 5spd guys would need is a clutch!

 

Still why let cylinder 5 and 6 work the hardest, when all of them could be working as hard

 

I'm in the process of converting my NOS kit to the NX kit. My girlfriend is sponsored by them, and they just sent her the direct port conversion kit for her car, so I'm taking the single nozzle setup. Just from installing both kits, I'm much more impressed with NX. Much more attention to detail in the kit, little things like brackets/nuts are all so much nicer.

And I've never heard of anyone actually having a problem with fuel puddling due to long intake runners. The only cars I've heard about that happening to are VTEC motors with the variable runners. A very few people had problems with nitrous puddling under the butterflys from the opening/closing. But not that many maximas have variable intakes yet, so I don't see that as a big issue.

 

Apparently, to the experts cylinders 5 and 6 run lean. This applies whether N/A or boosted so you don't have much of a choice. Its either lean or lean.

 

why are we attacking NX vs NOS in a Direct Port vs Single nozzle setup? NOS also has direct port.. if you guys want to knock the dry kit... then knock the dry kit.. don't attack the company NOS..

 

I am comparing a single nozzle NOS to single nozzle NX.

 

i wasn't talking about your write up.. i was talking aobut some of the comments i seen echoed in this thread

 

Sorry Sprint thought maybe I had you confused, I should have known better. I don't have any real complaints about NOS but I do think NX is better, of course it costs more too so it should be.

Jim

 

[QUOTE]Originally posted by Jime


Sorry Sprint thought maybe I had you confused, I should have known better. I don't have any real complaints about NOS but I do think NX is better, of course it costs more too so it should be.

Jim [/QUOTE


Jime is right i have the nx kit single nozzle and have had not one complaint about it. It works great and i will continue to use it. I owned a zex kit before, and the best i did was a 14.3 on a 65 shot, i put the nx wet kit and i am currenty at a 13.6 @ 100mph on a 75 shot.If someone would ask me i would recomend the nx kit.I have a 96 auto with,trans cooler,ur udpulley,pr cai,y-pipe,and full exhaust.

 

HEHE It's good to see this write up I was doing a search for some info and found this post. For years I have been telling people how much better NX is compared to NOS. Superior quality components and engineering. Thanks for giving others the heads up they seem to like your comparison. Low 13's on 75shot NX > high 13's on NOS 100 shot .

 

What kind of shot can you run without changing the stock spark plugs? Any power loss or drivability problems off the bottle with the copper plugs?

This is starting to sound tempting

 

I wouldn't run at all without changing the plugs. I am currently running two steps colder gapped at .035. Drivability off the bottle is the same to me as the original platinums.

 

NX is by far a better kit,I think JIME knows that the most,thanks to JIME's methods and help, I have got my best 1/4 time this past sat. Reation:556, 60ft:1.8, 1/8:8.5, 1/4:13.5@100.5mph. T his is on a 75 shot. Hoping to get the jets for the 100,and 125 shot. When they come in i will take the car to the trck and run it again.

 

Has anybody done the 150 shot?

 

Mine was max'd out at 100...I never really had the time to test/tune it to 150. I wasn't the first with the NX wet kit, but I know I was one of the first few.

1 bottle a week
for
30,000 miles
on
a car that had over 90,000 miles.
with
no problems.


Thanks NX!

Erik

 

What does the NX kit cost? and what about using a window switch w/ it?

 

Side Note: My friend with his Camaro, had an NOS kit and then switched to a NX kit. He said everything was better and it's easier to "tune" and use. Basically tuning is just as Jime said, look at a sheet, and pick which fittings to use for Fuel and nitrous.

You can see his car here if you want:
http://www.bryanb.com/site/maxima/camaro/car.html

And yes you can use a window switch with them, but they're extra.

 

so the pressure stays up at whatever jet you use?? there are 2 jets used right? i'm still lost on how there no tuning needed.

 

So the kit contains EVERYthing you need.

Anything else that's needed or wanted.

 

Hmm...why would you want to if you don't have a prograssive controller or 2 stage system? I can barley get traction with NOS 100 shot. I get zero traction in 1st gear with NOS 125 shot

 

Two jets: One for fuel and one for Nitrous.

NX has been done lots of research and has a sheet which you can cross reference for HP output. According to my friend, you look at the sheet which came with your system, and if you want 100HP shot it says to use XX jet for nitrous and YY jet for fuel. And you'll get a 100HP shot without tuning.

They are supposed to be pretty accurate. The jets are listed so that you don't have to worry about running lean. Whereas I think NOS systems you have to experiment a little more to find the correct combination of jets.

 

hmmmm. i wonder what the fuel pressure gauge reads.. compared to a tuned nos system running lets say a 75 shot of n2o.. would the fuel pressure be the same on both systems?

 

Wicked the fuel pressure on the NX system runs exactly the same as without the NX system ie 34 at idle and 43 at WOT. The NX system does not fool the fuel pressure regulator and raise fuel pressure like NOS. The fuel is injected into the intake with the nitrous at normal pressure and atomized there instead of going through the injectors at a higher pressure. The fuel pressure on a 75 shot of NOS should read approx 75 psi vs 43 for NX.
That is why there is no tuning required. NX has calculated the nozzles required for a Maxima running at stock fuel pressure.
NOS on the other hand requires a different fuel pressure for each shot and you just have to play with the fuel jets until you get the right fuel pressure for the shot you are trying to run. Its a biatch believe me in comparison, because just about every car uses a different fuel jet to get the same pressure. There are no absolutes in fuel pressure running the NOS system.

 

sounds too easy.. how does the extra fuel needed get raised? with the n2o pressure? sorry but i'm still not getting it
how it a 75shot able to run at 43psi? also a fuel pump isn't needed then right? you have a window switch?