Nitrous Express (NX) Users Get in Here

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Nitrous Express (NX) Users Get in Here

#1 Post by John_Heard » Fri Dec 22, 2006 8:08 am

Anyone actually tried any of these NX supplied tune ups? I'm curious what your results were? :shock:

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Mike Woods - WTF were you thinking when you sent this out to your customers?

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Mike Peters
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#2 Post by Mike Peters » Fri Dec 22, 2006 2:38 pm

Does he think the fuel pressure is enough to cover the huge jet gap? :shock:
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#3 Post by drummondracing » Fri Dec 22, 2006 2:44 pm

beyond, read my post under fuel pressure settings and give me a shout you seem very knowleged in this area thanks
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#4 Post by John_Heard » Fri Dec 22, 2006 3:19 pm

Mike Peters wrote:Does he think the fuel pressure is enough to cover the huge jet gap? :shock:
That certainly seems to be someone at NX's belief! I'm thinking Mike Woods needs a :nutkick:

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#5 Post by 79 Camaro » Fri Dec 22, 2006 5:40 pm

Bob West... Haven't you used a NX Kit???
If so what was the Jeting and how did the plugs look?
Last edited by 79 Camaro on Sat Dec 23, 2006 5:10 pm, edited 1 time in total.
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#6 Post by graydog » Fri Dec 22, 2006 11:43 pm

John
This is the same jet card that came with my NX Gemini Twin plate. I've used the 100 and 200 jets with great results. This is by far the best plate system I've ever owned. I wouldn't be so quick to criticize NX for doing things differently than some of the other nitrous companys.
Scott

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#7 Post by John_Heard » Sat Dec 23, 2006 6:43 am

Scott - I'm glad you replied, and that you like your plate. I really don't think there is anything wrong at all with the parts, it's just that jet map that made my jaw drop when I first saw it.

I hope you don't think I'm being quick to criticize this chart, when I first saw it I couldn't believe it, so I asked a number of people who routinely spray a lot and everyone I've spoke to thought that this chart was a bit nutty, or that we're missing something in the design of the plate that makes it respond differently than any other nitrous plate out there.

Let me ask you this, what fuel pressure was you using on those 100 & 200 shots? How much timing was you taking out?

Do you realize what the nitrous to fuel ratios are on that card? Here's what they "should" result in for a nitrous to fuel ratio:

The "100hp" shot 41/31 jets (x2)

10 psi = 6.49 N/F ratio
9 psi = 6.85 N/F ratio
8 psi = 7.25 n/F ratio

The "200hp" shot 52/38 jets (x2)

10 psi = 7.01 N/F ratio
9 psi = 7.38 N/F ratio
8 psi = 7.82 N/F ratio

300 hp shot 57/41 jets x2

10 psi = 7.28 N/F ratio
9 psi = 7.66 N/F ratio
8 psi = 8.14 N/F ratio

400 hp shot 78/57 jets x2

10 psi = 6.87 ratio
9 psi = 7.26 N/F ratio
8 psi = 7.68 N/F ratio

500 hp shot 99/73 ratio x2

10 psi = 6.89 N/F ratio
9 psi = 7.27 N/F ratio
8 psi = 7.7 N/F ratio

In comparison the old NOS big shot/double cross plates that have been around for years it's very common to "square jet" them, I'm sure some of you have heard of and/or ran that tune up in the neighborhood of 5.5 to 6.5 psi or so. That tune up is typically a bit more aggressive then the charts NOS supplies with the product...

Lets review about a 300 hp tune up for example 60/60 jets x 2

6.5 psi = 4.62 N/F ratio
6.0 psi = 4.82 N/F ratio
5.5 psi = 5.03 N/F ratio
5.0 psi = 5.27 N/F ratio

Those ratios are generally considered pretty safe, a bit fat but good place to start. Sure they can probably go leaner but is it responsible of NX to be starting people out at 7.28 N/F ratio in some cases? I don't think so that's why I posted this...These NX N/F ratios are far leaner than anything I've ever seen from a Nitrous Company shipped with a new product.

The "Very Safe" tune up, is NOT in my opinion a very safe starting point. Yes, it might work, but it's STARTING OUT at what is typically considered a very aggressive tune up. The "Safe but lean" numbers, well those are just starting to get a little nutty and I believe totally irresponsible.

Or it could be that I'm completely wrong here, if so someone please prove it to me....

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#8 Post by ytnova » Sat Dec 23, 2006 8:59 am

Currently I am using a nx plate also, although I have never looked at the n/f ratio numbers on it, I can tell ya it feels aggressive, and it hits hard, even without purging the kit, but I have never so much as nipped a plug and I have used it on two different motors. Here is the way my tune-up sheet reads, but remember it has four spray bars, but a single stage, one fuel and one nitrous bar on the outside edge of the plate. Also this is plumbed into a 4150 super sucker spacer:
Stage 6 Gemini Twin HP series
hp n20 fuel
50 28 22
100 41 31
150 52 38
200 57 41
250 78 46
300 99 52
Flowing fuel pressure
10psi VERY SAFE, 9psi SAFE, 8psi SAFE LEAN

I have run up to a 250 shot on my previous motor, but never went with any more because the selenoids would not flow it, and had no issues with 9psi, 900-950psi in the bottle, the usual 1 degree per 25 hp shot and using pump gas. The plugs also looked fine. I will say this was a very low compression motor and I eventually kept adding timing until I was able to run a 150 shot with 40 degrees of timing still in it. I only am using it on my new motor because my dominator adapter is off and being plumped with two stages in it, and I wanted to run the car and start tuning the chassis for the radials. A 150 shot is all that I have used on the new motor, because of learning about drag radials, but the plugs look good using 9 psi, 900-950psi in the bottle, and 6 degrees out.

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#9 Post by graydog » Sat Dec 23, 2006 11:07 am

John
I see what your saying about the ratios. I'm running radials also and don't think I ever saw the full potential of the system. On a 100 shot I had to pull 10 deg out to get the car to leave without spinning. I had no way of putting the timing back in. At 9 lbs of ffp the plugs looked good and had no heat mark on the strap. After learning more about reading plugs I wonder if maybe it was on the lean side and taking so much timing out made the fuel ring look OK. I never could get the 200 to work except for in high gear. With the same ffr and timing the plugs looked ok but the nitrous was only used for about 3 seconds. Next year I'll have a dig 7 ignition and will know for sure. I think you should call Jon Phillips at NX. I've spoke with him on several occasions and think he know what he's talking about. His # is 888-289-6261.
I wish everyone a merry Chrismas and hope Santa brings lots of cool car parts.
Scott

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#10 Post by Bob West » Sat Dec 23, 2006 12:01 pm

79 Camaro wrote:Mike Woods = bop: woot:

Bob West... Haven't you used a NX Kit???
If so what was the Jeting and how did the plugs look?
I havent even got to tuning it yet, started with a 150shot, blew the tires off. I dropped back to a 100shot, better but still no traction, got more suspension work to do before I even start to tune it. Actually I have it up for sale, ran 2 bottles of nitrous through it. I am mainly after n/a performance. I originally bought it to stay ahead of my son.
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#11 Post by Racer704 » Fri Jan 05, 2007 5:51 pm

Hey John sorry I didnt see this earlier but a long time ago I used a NOS Cross Bar plate on a few cars that I did work on and I had the N110 and F93 with 6PSI flowing. Ran good it did get after a few plugs and I just jetted up the carb and took care of it. I did take out 12 deg timing. Without flowing the plate its hard to say what and how many holes are in the plate and sizes.
Johnny B.

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#12 Post by John_Heard » Fri Jan 05, 2007 6:03 pm

I've recently read somewhere that the Jet's NX uses are different too, so maybe I was a bit harsh in what I said. I would like to see how many lbs per hr fuel and nitrous their tune ups flow to see if they are really lean or it's just the design of their setup that requires those tuneups.

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#13 Post by 79 Camaro » Fri Jan 05, 2007 6:11 pm

This is what they say about thier jets on there web site.

http://www.nitrousexpress.com/Pages/Jets.htm
"THE THROTTLE IS THE DEVIL" By Mr. Willis
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