[Mikes99 4.6]

Ive been trying to figure this out for 2 weeks! Heres whats happening when I hit it it doesnt come on till after 3500 when im done making the pass as soon as I let off the gas the car dies it has the 2600 and 6000 chip in it . have tried it on the 100hp jets and 125 does the same thing .What should I do im to the point im ready to sell the car because of it bottle pressure is good .Tried putting a 3000 chip in it then it doesnt want to come on till after 4000 and still dies. What could be causing this! I ve checked all the wireing a dozen times. it is right could this thing be loading up with fuel should I try running the 100hp fuel jets with the 125 nitrous jets? is my window swith messed up or maybe its the tps switch:confused: I just dont know please HELP!!!!! just to give you an idea how bad this kit is working I raced a 96 Ram air ta all stock m6 and only won by a car and that was with me sprayn now that is sad!

[Mikes99 4.6]

oops! My car is a 99GT
THANKS!

[jimfitzgerald]

Does the window switch work with a coil on plug setup. Maybe you need a tach adaptor??

[Mikes99 4.6]

Yes in the manual they have the coil cop instructions.

[Mikes99 4.6]

ttt

[Mikes99 4.6]

Almost a year later and still having this problem please can someone give me some advise

[03STEED]

The problem is running this system with the returnless fuel systems. I have the same system. Mine studers a little when it comes on and it also dies after a nitrous run. Well I took it in to have it tuned over the weekend and it couldn't be done. The a/f was all over the place and the tunners told me if I were to keep running it like that it will sooner or later blow the motor. From what they said the Noszle system will work great on a car with a return style fuel system. Also he said they haven't been able to tune any returnless fuel system car with a nitrous kit that pulls the fuel from the fuel rail. Go get your car on the dyno with a wideband to confirm this for yourself. My a/f bounced from 10.6 to 14 to 16 to 17 to 21.

[hellraiser99]

I have this in my 1999 gt when I was shooting the 125 shot what i did to conpensate I went to 30 pound injectors and a 255 intank fuel pump never had any problems when I took my car to the tuner I got a flip chip and never had any problems tunning the car.Now after I got all my internals forged I am going to be running a 200 shot with a stand alone fuel system.

[Mikes99 4.6]

so what you guys are saying is that my car is probbably not getting enough fuel? Did either of you try running larger jets on the fuel side to compensate or is the factory fuel system that bad?

[hellraiser99]

hey Mike

I spoke to NOS about the problem you are having the tech told to check your fuel pressure it has to be @ 45 in order to turn the sysytem @ 3000 RPMs

[Mikes99 4.6]

what should the pressure be at thru the hole pass? I would figure if it holds good pressure it shouldnt be staving for fuel right?

[03STEED]

Here's what the tunner told me the problem is:

"it's really the way the system is designed to intergrate with the returnless fuel system - it's a bad design. It must have been rushed to market by someone who didn't really understand how a returnless fuel system works.
In an electric returnless fuel system vehicle, the returnless
system actually controls the pressure drop across the fuel injectors. It
does NOT control fuel rail pressure. The sensor on the fuel rail has a
manifold vacuum/boost line hooked to it that feeds it the pressure/vacuum in
the manifold. The sensor is mounted to rail so the output of the sensor is
actually the pressure drop across the injector. The flow of a fuel injector
is dependent on the pressure drop across the fuel injector.
So, the PCM is getting pressure drop feedback from the sensor and
controlling the fuel pressure drop across the fuel injector. If the pressure
is too low, it increases the voltage to the fuel pump to get it back to
where it should be. If the pressure is too high, then it lowers the voltage.
When you are pulling fuel from the fuel rail where the NOS system is hooked
up, you are really messing up the pressure drop across the injectors, it's
oscillating between under and over compensating"

[hellraiser99]

03 steed so by making a stand alone fuel system for the nitrous you will eliminate this problem,I will be going to a 200 shot since i have forge internals DSS block,What I am going to do is a fuel cell with an inline fuel pump and a filter that will feed the NOS and have it own fuel pressure. I have calculated the cost is going to run me about $600
fuel cell $100
fuel pump $210
fuel lines and fittings $ 190
fuel pressure regulator $70
I think this should fix the problem!!

[03STEED]

Yep that sounds like the best option if your goiing to run a wet system on the returnless cars. Another way I heard of was to disable the fuel solenoid and put more fuel in via the injectors, essentually making it a dry kit. But then you'd need bigger injectors, MAF, and probably 03 tank and pump. I finally got in touch with NOS tech support and he confirmed there are issues with the system on returnless cars. What the tunner told me is right on according to them. He says they are working on a fix and are still selling the Noszle kit advertised for 96-04's. He says that even though theres a lean condition chances are its not lean long enough to hurt anything. But there is a CHANCE that it could break something. However on a 96 to 98 return style system the Noszle kit works great.

[Mikes99 4.6]

Thats a good idea! my buddy had a 68 chevelle with a cheater kit on it what he did was buy a 1gal fuel cell a holly blue pump and some line and fittings mounted every thing under the hood his set up worked great. I wonder if u could do the same on the mustang and fit it all under the hood?

[NiteMareGT]

Though I'm not running the NOSzle system, I am running a ZEX wet system and I have yet to experience any problems.....

[03STEED]

Have you had it on the dyno to check your a/f ?

[Mikes99 4.6]

no not yet. Im not sure where to take it? Im torn between taking it to either anderson ford in clinton whitch is about 2hr drive or atr motorsports about 10min. away. Problem with atr (formally anderson motorsports) is that I hear nothing but horror stories about the place only people I know of that have went there own older carberated cars so Im alittle lery of taking a newer fuel injected car there but maybe im just being paranoid.

[hellraiser99]

Before you take to get it tune get a stand alone fuel and you wont regret it ,it really is not that expensiveand you will save the money if you ever go lean

[3xBlack2000GT]

It sounds like I have been seeing the exact same conditions you guys have been describing. I just finished installing the NOSzle kit with the 100 shot on my 2000 GT. I had fantastic results in regard to Torque and Power!!! However, as you can see in my attached dyno sheet, I saw a seriously lean condition spike thant starts from about 2700 RPM and lasts to about 3300 RPM.

At this point, I am thinking about the following combination to fix the problem. 30lb injectors, 255 in-tank pump, flip chip+tune, up to 125 shot. Any advise from those of you with this combo? Did Holley offer any solution like this?

[3xBlack2000GT]

It sounds like I have been seeing the exact same conditions you guys have been describing. I just finished installing the NOSzle kit with the 100 shot on my 2000 GT. I had fantastic results in regard to Torque and Power!!! However, as you can see in my attached dyno sheet, I saw a seriously lean condition spike thant starts from about 2700 RPM and lasts to about 3300 RPM.

At this point, I am thinking about the following combination to fix the problem. 30lb injectors, 255 in-tank pump, flip chip+tune, up to 125 shot. Any advise from those of you with this combo? Did Holley offer any solution like this?

[Satan]

Hey guys. Going to 30# injectors will not fix your problem, if anything it will make it worse. If you dont have alot of power on motor, or a charger, your car is going to run like sh$t with 30's, or 24's for that matter. And as far as not being able to tune a returnless fuel car, not trying to sound like a a$$, but ive seen it done on a regular basis at the shop here in charlotte. These guys are having no problems tuning 99 and ups. I myself run a nos/nx mix system ( nos solenoids, nx nozzle) and have the stock pump, injectors, etc. and have never had a problem. I would take the car to a reputable dyno shop, and see whats up with the tune. And another thing. Nos is very known to have their jetting reccomendations way on the rich side, as to be on the safe side. I would check on the dyno before I went any futher.

[3xBlack2000GT]

Yeah, you probably right Satan. Had not considered driving the car without nitrous...

I talked to the guys at Paul's Automotive Engineering (Cinci, OH) about this. They seem pretty confident that I will be able to work around this with flip chip and some tuning. I'll let you guys know.