A buddy and I recently installed the zex universal kit for his 97GS. There are three wires comming off of the throttle body. We were told that the TPS sensor needed to activate the unit comes off one of those wires. After checking the voltages of each wire against the voltages when the throttle is at WOT, we came to the conclusion that the TPS lead is the red wire.

Here is where it gets interesting. After taking a test run in his car, we found that his nitrous is activating when you throw the activation switch. Those of you that are familiar with the zex kit know that it is not supposed to activate unless you have your foot to the floor and at the WOT.

My question is, what did we do wrong? We suspected the NMU is malfunctioning, or we could have the wrong wire. Can someone with expecience with this kit give a little bit of insight.


Any help is appreciated,

-Erik

Well it has been said before that you can't use the Zex kit because our TPS doesn't have the correct voltage to make the kit work right. Make sure that you don't spray at anything but Wide open throttle because you might blow the engine. I would call Zex to see what the voltage needs to be for it to work right.




http://hometown.aol.com/ohshootuhh/

All Motor Beast in need of MAJOR TUNING

Perf:
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Sprint Front Camber Kit
$15 Rear Camber Kit
MSD DIS-2 Ignition System
Some Regrind Cams that need High Compression (which I don't have)
Ported Intake Manifold
Ported Throttle Body
Nameless Cold Air Intake with a K&N Filter
Custom 2 1/2 inch exhaust with Dual DTM Muffler
Empty Catalytic Convertor
Energy Suspension Motor Mount inserts
Hurricane_GS Short Shifter
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Clutchmasters Stage 3 Modular
225/50/16inch Wheels and Tires


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Alpine Flex4 25W X 4 for Fronts and Rears
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3 MTX 5000 10" 12 ohm subs running 4 ohms mono

uhhhh.... i have a 97RS, and unless your buddy has revamped his whole fuel system with a 95 set up, then dont try and spray anymore or you will blow the engine. the 97+ cars cant use a dry kit cause of our fuel system. use a voltage detector to test the WOT voltage, it has to be at LEAST 4.5 to use the ZEX kit, and when i tested mine it was barely over 4.1. again, if ur buddies car is a 97, and ZEX hasnt came out with a wet kit im not aware of, the dry kit wont work, it will blow the motor.

NitrousEclipse97@aol.com
http://www.teamklr.com
1997 Eclipse RS
JE Pistons
Crower Rods
125-shot Nitrous Express
AEM CAI
Greddy EVO Exhaust
NGK Plugs&Wires(one range colder)
Front/Rear Upper Strut bars
Eibach Pro-Kit springs
Tokico Struts
17" Konig Imagines
Yokohama A520's

1994 Eclipse GS-T
Greddy Boost Controller(15psi)
Greddy BOV
Autometer Boost and A/F gauges

Spraying without enough fuel would be really bad. He may have already done some damage if he sprayed a lot. I wonder if there is anyway to modify the ZEX box to have it activate a fuel solenoid and make it a wet kit. Hmm. . . I think it can be done. But then there is the voltage problem, but I am sure an electronics wiz like corbin could figure something out to make that work.




http://hometown.aol.com/ohshootuhh/

All Motor Beast in need of MAJOR TUNING

Perf:
KYB AGX Struts
Neuspeed Sport Springs
5 Strut Bars (2 F/U, F/L, R/U, R/L)
Sprint Front Camber Kit
$15 Rear Camber Kit
MSD DIS-2 Ignition System
Some Regrind Cams that need High Compression (which I don't have)
Ported Intake Manifold
Ported Throttle Body
Nameless Cold Air Intake with a K&N Filter
Custom 2 1/2 inch exhaust with Dual DTM Muffler
Empty Catalytic Convertor
Energy Suspension Motor Mount inserts
Hurricane_GS Short Shifter
Symborsky Shift Kit
Clutchmasters Stage 3 Modular
225/50/16inch Wheels and Tires


Audio:
Alpine CD Head Unit
Alpine Flex4 25W X 4 for Fronts and Rears
Alpine V-12 450W X 1 for Subs
Infinity Reference Series 5 1/4 and 1 inch tweeter component systems for fronts and rears
Blaupunkt 3 way 6x9's in the rears
3 MTX 5000 10" 12 ohm subs running 4 ohms mono

The newer ZEX NMU's have a self learn mode, meaning that it learns the voltage curve of the TPS on your car. Lets say it doesn't produce 4.5volts like you say, it is still supposed to learn whatever voltage WOT is at and activate the solenoid then.

Interesting that you say that it wont work for the 97+ cars. I thought that by re-routing the FPR through the NMU it is supposed to kick up the fuel pressure by creating more vacuum in the line when the nitrous is activated.

I guess what I am trying to say is that I am not sure why you can't use a dry kit on his car. I figured that a 55 Shot would be well within the capibility of the stock fuel system of the car. Any more insight on this.

The fuel pressure regulator on the 96+ OBD-II cars is back by the fuel filter and the return line is back there too. You would have to change the fuel system to a similar setup to the 95 OBD-I cars with a return line from the front and the FPR on the fuel rail.



http://hometown.aol.com/ohshootuhh/

All Motor Beast in need of MAJOR TUNING

Perf:
KYB AGX Struts
Neuspeed Sport Springs
5 Strut Bars (2 F/U, F/L, R/U, R/L)
Sprint Front Camber Kit
$15 Rear Camber Kit
MSD DIS-2 Ignition System
Some Regrind Cams that need High Compression (which I don't have)
Ported Intake Manifold
Ported Throttle Body
Nameless Cold Air Intake with a K&N Filter
Custom 2 1/2 inch exhaust with Dual DTM Muffler
Empty Catalytic Convertor
Energy Suspension Motor Mount inserts
Hurricane_GS Short Shifter
Symborsky Shift Kit
Clutchmasters Stage 3 Modular
225/50/16inch Wheels and Tires


Audio:
Alpine CD Head Unit
Alpine Flex4 25W X 4 for Fronts and Rears
Alpine V-12 450W X 1 for Subs
Infinity Reference Series 5 1/4 and 1 inch tweeter component systems for fronts and rears
Blaupunkt 3 way 6x9's in the rears
3 MTX 5000 10" 12 ohm subs running 4 ohms mono

It's not impossible to run a dry kit on the 96+, it is just much more of a pain in the arse, rerouting, chancing things etc.

Michelle

We will NOT forget!
September 11, 2001


96 Eclipse Base Model
Best 14.6@93 w/60 shot
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