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Old 04-08-2002, 08:32 AM   #1
ND4SPD2000
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2000 Impreza 2.5 RS
Sedona Red Pearl

Default Need Help Finishing ZEX Nitrous Install

Sup,

Well last night I ran the Nitrous Bottle Line from the trunk to the Engine Bay. All I have to do now is hook up the Computer and run the switch to the dash or wherever I'm going to mount it. Ok. I know the white wire T's to thye White TPS. The red will be for the switch, the Black would be ground. That is taken care of. Now my problem is all the hoses and all that.

Then we have these two black hoses that the kit came with. These two hoses are the ones that have me all confused. Ok I know one of them goes to the Fuel regulator. Question: The fuel regulator will be that UFO looking thing. Where do I connect this hose to. To the Manifold or the regulator? Because if I connect it from the regulator to the Nitrous Unit, then what happens to the Hose that is connected in the manifold? Does it just stay connected there to nothing or do I connect it to something else. (A picture is worth a 1000 words).

Then we have the other black hose which it says it goes connect to the manifold. Does that go connected to where the fuel regulator used to be connected or somewhere else? Where else will it be connected? (A picture is worth a 1000 words)

ND4SPD2000
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Last edited by ND4SPD2000; 04-08-2002 at 11:46 AM.
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Old 04-08-2002, 11:21 AM   #2
ND4SPD2000
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ttt
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Old 04-08-2002, 01:00 PM   #3
AndyM
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WR Blue Pearl

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Man I just freakin wrote all this infomation and it dissapiered:

Hey Hey! Im going to install my kit today too. I want to help as much as I can. OK lets start from the top. You have a small hose that connects to your fuel regulator (the thing that looks like a UFO), and intake manifold. If you cant find the fuel regulator its on the passenger side of the engine bay.
Now take off that hose that are attached to the fuel regulator and intake manifold, there on they’re pretty good so take your time. Don’t rip it off. Next take one of the supplied hoses from the Zex kit and attach it to the fuel regulator. Now with the other end of the hose that you just attached, connect it to the fitting on the Zex control unit that says “Regulator”.
Now with the other supplied hose take it and attach it to the fitting that is on the intake manifold, now before attaching the other side to the Zex control unit, you have to choose the fuel get you want, this is crucial if you don’t know what jet to use look on the back of the Zex instructions (the tune-up sheet) if it’s a 55 shot use the # 32 for the NITROUS jet, and the #36 jet for the FUEL jet. After choosing the jet insert it to the Zex control unit that says “Intake” it can only go in one way. After that get the brass hose barb (it looks just like the regulator fitting that is already on the Zex control unit) now put it together and screw it on, and attach the hose. The only one left is the nozzle, and I think it speaks for its sell just place it 6 too 18” from the throttle body.
Some people say not to use the hose clamps supplied with the kit, I say use them. I’ve heard of a couple people using the kit where the hose has popped of the intake manifold, use the hose clamps, if they don’t work try zip ties those should work, oh yeah Use Teflon tape or pipe sealer, just incase some N20 may leak out. I would say use them on anything you have to tighten together, just not the hose clamps. Good luck I’ll check back through out the day.
Good Luck
Andy M.
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Old 04-08-2002, 01:57 PM   #4
ND4SPD2000
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Sedona Red Pearl

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Andy,

I appreciate your reply. I am glad to see that someone is helping me out. Ok, we have the hosing all set now. Ok, now what do we do about the wiring? Red would be to the switch correct? So therefore, we connect both the red switch to the wire with the fuse in it right? Ok, then we have the black wire. We can just go ahead and ground it anywhere in the chassis right? And we use the circle connector for that right? And the white wire we "T" it to the TPS. Not a problem there. Ok, on the switch. The two wires that are on it. One (The one with the fuse) goes to the red, and the other one? Where does it go? To where?

Where are you installing your switch at? Well write back with your reply. I once again thank you for being so informative.

Jesus
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Old 04-08-2002, 09:07 PM   #5
AndyM
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WR Blue Pearl

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ok lets see the arming switch wire that has the fuse attached to it has to be connected to a 12 volt sorce, so in that case I think Im going to use the cigarette lighter, the other wire that is still left now has to be connected to the red wire that goes to the Zex control unit, bingo should be all hooked up and the TPS which you have convered. Oh yeah the black wire you can ground to the chasse, the little circle thing is for the black wire on the Zex control unit just strip the wire so some more wire is explosed and take the circle ground, insert to the wire and crush it on the wire for a tight relihable (sp) ground. As for mounting my switch I have yet to do that, Ive been at it all day with the kit. Taking my time. I was thinking of useing one of the coin holders by the E-brake hollowing (sp) it out and try to mount the switch in their instead of drilling yet another hole in the plastic. Im sorry about responding so late, like I said before Im installing mine too at this time, good luck got any more questions I'll be glad to help as much as I can.
Andy M.
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Old 04-09-2002, 12:10 PM   #6
ND4SPD2000
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Andy, check your PM's. I sent you a PM. Thanks bro.


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Old 04-09-2002, 03:04 PM   #7
20mm
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Platinum Silver Metallic

Question

Hey guys, I'm going to be installing the same kit this weekend and reading your conversation is helping alot. I few questions though. The nitrous line that needs to be installed 6"+ from the throttle body, how does this work with the air box right there? There are only 3" or so between the throttle body and the airbox, should I install there? Or before the airbox somewhere, will the nitrous make its way through the air filter alright? As far as everything else, what are you guys going about fueling? Will the ecu provide enough fuel to prevent lean condition with a 55 shot? How about a 75 shot? Are you guys going to be using a new fuel pump? Injectors? RRFPR? S-AFC? Is any of that necessary? I want to make sure my baby gets enough fuel to keep the egts down. Any advice will be much appreciated. Thanks

-Chad.
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Old 04-09-2002, 07:14 PM   #8
Supapooh
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I don't know what to say about the air box..... I doubt the nitrous will go through the filter either. With a 55 shot the stock fuel system should do fine. Thats whats cool about the zex is that the zex brain itself raises the fuel pressure to accomidate the nitrous. So its pretty much self contained. With a 75 shot I would definently raise the fuel, maybe a fuel pump would do it, but then again every car is different. Ive heard of some people running 75 shots without a problem, but I don't know whats done to their car. My thing is its better to be safe than sorry, and with a 75 shot I would definently want to be running an egt gauge to watch those temps.
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Old 04-09-2002, 09:35 PM   #9
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Definetely get an EGT guage. The funny thing is, depending on bottle pressure you can get really mixed results since the zex kit is run purely off of bottle pressure. I've noticed with the 55 shot, on warmer days the EGT's would dip into the 1500's. On colder days it is no where near 1500. I run a bottle warmer now so I feel pretty good about having a consistant bottle pressure. I still keep my eye on both guages though.
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Old 04-10-2002, 02:00 AM   #10
20mm
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So I guess I should install the line in that little space between the throttle body and the airbox, will that cause any problems being only 3" from the throttle body? Also since I'm in Hawaii and its always freakin hot, I dont think I need a bottle warmer, so thats a plus. On the other hand the hot weather will probably raise my egt's dangerously If I plan on going to the 75 shot I guess a rrfpr and a walbro fuel pump should do the trick if I tune the s-afc to richen things out? Probably going to need a voltage clamp too eh? To keep the safc from raising the map voltage too high, fuel cut would be bad with nitrous flowing Wait a minute, with the zex system, as soon as the ecu cuts the fuel it will stop the nitrous right? But there will still be a few seconds of extremely lean, ouch. Still worried about the nitrous jet being so close to the throttle body, I'm sure they dont say at least 6 inches away for nothing. Sigh so many questions

-Chad
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Old 04-10-2002, 08:12 AM   #11
ND4SPD2000
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2000 Impreza 2.5 RS
Sedona Red Pearl

Default Update on My Install

Sup guys,

Well everything is set. The only thing I need to do know is drill the holes to mount the bottle at well as drill the hole to stick the nitrous nozzle in the intake. Question, what drill bits did you guys use to make the holes to mount the bottle in the trunk? What side should I mount it on. I'm afraid that if I drive a hole I might drive into the fuel tank so I need your help on this one. I need to know the drill bit size to be able to drill the holes and I need to know where exactly did you guys mount it.

Ok, well I have a question for all of you guys that have it installed. Ok, well I was testing out the NMU by putting it on the on position and depressing the accelerator and hearing the clicking sound and all knowing the it is ready to be used. I turned off off the switch. Then I turned on the car, it began to idle fine and continued that way so I knew it was all fine. I floored the car, the car sounded perfect. So cool, So I took the car for a spin. I was just riding around making sure my car still ran right after installing the NMU. I got to the stop sign, rev'ed the car up to like 4500, dropped it into gear and took off. First gear went fine, second gear went fine, got to third gear and all was fine. SO as I started to slow down. I let go off the accelerator and all of the sudden, I have a turbo in my car. I let off the accelerator and it sounds like a blow off valve (Pssssssss sound but not too loud). So I try it again and nothing happends. I do it again and this time it does it on gears 2 and 3. It only does it when I really floor the car and dog it. To me it seems that it's letting go of pressure. What do you guys think? Does it do it to yours or you have'nt noticed it. Do it and you'll notice. Again, it's not too loud so you really gotta hear it. Write me back and tell me what's up.

Jesus
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Old 04-10-2002, 11:30 AM   #12
RS_NW
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Quote:
What side should I mount it on. I'm afraid that if I drive a hole I might drive into the fuel tank so I need your help on this one.
I put mine far back on the driver side. Sorry I don't have pics. It's about 4 inches from the spare tire well if you are looking down at it into the trunk. The back of the bottle is about 3 inches from the inside end of the tailight. I had to take off the heat shield underneath the car (for the muffler) to access this part.

Quote:
SO as I started to slow down. I let go off the accelerator and all of the sudden, I have a turbo in my car. I let off the accelerator and it sounds like a blow off valve (Pssssssss sound but not too loud).
Maybe you didn't tighten the vaccuum lines coming from the nmu to the intake manifold. That would be my guess. I get no noise similar to that when I dog the car after a hard run. My car only makes that sound when I turn it off. I would also check to see if you programmed the TPS setting on the NMU correctly. We thought that we did this correctly in my friends eclipse and the solenoid would click over every time we would throw the switch. (Ouch) We didn't notice at first but I thought it was weird that his car would hiss after we would throw the switch.
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Old 04-10-2002, 11:58 AM   #13
AndyM
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hey 20mm Im having the same problem I have the ganzflow so that means Im still using the stock airbox, I guess Im going to mount the nozzle on the upper left hand side of the air box I measured where I wanted to palce it and its about 7 1/2 inches from the throttle body, can anybody help with this?
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Old 04-10-2002, 12:01 PM   #14
AndyM
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WR Blue Pearl

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I mounted my bottle in the same place RS_NW did, and I just used normal drill bits, it worked out great, but I did have to remove the heat sheild right above the muffler its held on by (4) 10mm bolts fairly easy to get too.
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Old 04-12-2002, 04:24 PM   #15
20mm
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