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Old 05-29-2003, 11:22 AM   #1
Impreza2000
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Default zex nitrous system info and questions

I used the search feature and found nothing.

I would like to hear from people that are running Zex dry system N2O.

What jets are you running?

Any problems?

I am ordering my kit today after work and I need details.

Has anybody tried the ZEX ejector air amplifier?

I am ordering from summit racing, they have everything in stock for a good price.

I am also ordering the .026/.040 jet set for 35hp boost.

FYI: .023/.042 = 25 HP .029/.038 = 45 HP

I also hear not to run ECU chips with n2o under 55HP because they alter timing. Does the proECM adjust timing?
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Old 05-29-2003, 12:08 PM   #2
AndyM
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I had my zex kit for a year and never had any problems. I used a 55 shot, and the 65 shot jet used for the fuel jet. You'll understand once you get the instructions. I did notice my clutch would slip some with the 55 shot. As for the air amplifier, I wouldn't get it. All it is, is a cone filter with a whole so you can screw in the nitrous nozzle. Just use a drill and tap the old fashion way. I also have a TC II that I used with the nitrous and didnt have a problem. I have never gone past 55. I've seen some other people run the 65 shot. Maybe they reply to your thread good luck

Andy
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Old 05-30-2003, 12:08 AM   #3
kturner
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ZEX came out with smaller shot jet sets? That's good. Back in the old days, like a year ago, the 55 shot was the lowest there was. My clutch started slipping after a dozen or so bursts. They're good bursts though. I got some smaller 24 and 26 NOS jets trying to get below the slip point. I had to modify the ZEX injector nozzle to fit the NOS jets. I didn't want to modify the pressure regulator side so I stuck with the ZEX fuel jets. My clutch is normally fine but will now slip a bit with even a 24 jet's initial surge of power. I'm pretty much not using the system until I find some reason to install a new clutch. Otherwise the ZEX system works fine and I like knowing it's there. Maybe I should get some bigger fuel jets, throttle the fuel back and see what happens. A/F is quite green with a 24 nitrous jet and the 38 fuel jet. Plugs look good though. Don't know anything about chips, sorry.
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Old 05-30-2003, 12:26 AM   #4
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I've had it for around a year and a half. Usually run 55 shot, but occasionally I've switched to an 80 shot. I killed my clutch within a couple weeks on the 55 shot. It's pretty cool feeling, especially the 80 shot. I can take down stock WRX's no problem.
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Old 06-03-2003, 11:35 AM   #5
Impreza2000
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I seem to hear a lot of people smoking clutches on N2O. Are you talking about the stock clutch or aftermarket. I have an ACT clutch and an aluminum flywheel, am I going to smoke the clutch and warp the flywheel? I am starting out with a 35 shot to see what happens.
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Old 06-03-2003, 01:49 PM   #6
joefocker20
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I wonder if the Exedy Street Clutch can hold up to a 75 shot? I'm thinking about buying a NX wet kit soon.
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Old 06-03-2003, 04:19 PM   #7
kturner
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My clutch was and is stock. I have an ACT on the shelf waiting for a good reason to put it in. 2000 - How do you like your ACT? Is the stiffness tolerable in town and is it easy enough to slip a bit?
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Old 06-03-2003, 04:26 PM   #8
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Just put it in, it took me, my buddy and a girl who played toolgirl 9hrs to put it in, but we ordered pizza, I had to go buy a clutch alignment tool that fit in the pilot bearing, and there were numerous times when I had to chase her around the shop and smear grease on her face for putting grease on me. This was the first clutch and flywheel I've installed, and I pulled the engine. I would figure I could do it in 4-5 hours of straight busting ass work.
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Old 06-03-2003, 05:01 PM   #9
Impreza2000
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The act clutch is perfect for the street in my opinion. after breaking in it shifts alot smoother than at first. The actual stiffness of the pedal is slight. The weird thing to get used to is it engages sooner as you release the pedal. after a few miles it was like regular old....

Has anybody hit the rev limiter on tap? The ZEX instruction booklet warns of severe damage to engine...

How do you raise the rev limit?

Where do I find the TPS switch?

Please, throw me a bone........
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Old 06-03-2003, 05:06 PM   #10
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Raising it w/ nitrous without supporting mods would be detrimental to your engine.
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Old 06-03-2003, 05:32 PM   #11
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Quote:
Originally posted by Impreza2000
Has anybody hit the rev limiter on tap? The ZEX instruction booklet warns of severe damage to engine...
Yes, once. I was afraid I'd screwed something up but it seems fine.

Quote:
Where do I find the TPS switch?
Here's a pic I just ran and snagged. The light is too bright so it's hard to see the wire colors, but there's a yellow wire with a red stripe, a white wire with a red stripe, and a black wire with a red stripe. You want the white/red one. If you hook a multimeter to it and work the throttle with your hand (with the key on), you can see the voltage go up when you open the throttle and down when you let go.



Keep in mind this is for my 02, your 00 might be different, but that should give you a pretty good idea at least.
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Old 06-03-2003, 05:56 PM   #12
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Right on, that looks fairly identical to my setup. I will be testing with multimeter ASAIGOW...........Thanks
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Old 06-03-2003, 06:00 PM   #13
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I live in Longview, Washington where can I get my bottles filled for less than $4.20/LB?!?!
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Old 06-03-2003, 09:18 PM   #14
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I get mine at CarQuest. Last fill up was $3.33/lb for 20 lbs. And thanks for the feedback on the clutch too.
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Old 06-03-2003, 11:52 PM   #15
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I know this is a stupid question, but how long does a bottle last?
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Old 06-04-2003, 02:31 AM   #16
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I get like 2-3 months between fills, but I don't use it much.

When I 1st hooked it up I had to fill every weekend
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Old 06-04-2003, 03:06 AM   #17
Blu25RS02
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Im buying a NOS Sneaky Pete system and dont know all the do's and don'ts yet to the whole nitrous scene. What is the safest shot I can run on my 00 RS which is as good as stock as far as the nitrous is concerned, IE AEM short ram, Borla Header, Stromung cat back, and soon to have either the Exedy or ACT plus the Exedy lightweight flywheel, which petty much dont matter. Another question that I have but already know the answer to, pretty much, is the fuel issue, I need more fuel being delivered. My whole fuel system is stock as of now but I plan to upgrade ASAP. So what I need to know is how I should set it up, choice of 35, 55, or 75 jets, on a stock fuel system for now, and stock block? Any recomendations on the fuel system would be greatly appreciated and anyone who knows how high I can take the shot too with my setup right now. Thanks guys.

Patrick
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Old 06-04-2003, 03:32 AM   #18
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Cool, Im debating now if I want to put my car on a supermodel diet and get spicy cams, wait for an ITB setup, and run a 75shot occasionally; or turbo my car in the winter.. A 2500lb Impreza anyone?
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Old 06-04-2003, 03:21 PM   #19
Impreza2000
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Quote:
Originally posted by kturner
I get mine at CarQuest. Last fill up was $3.33/lb for 20 lbs. And thanks for the feedback on the clutch too.

Which CarQuest and do you have an address so I can find it?

Thanks...............
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Old 06-04-2003, 03:45 PM   #20
kturner
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I drop my bottles off at the Corvallis location 541 752-7761. They truck them over to the Albany store to be filled. I should mention that the last time I filled up was Sept 2002. Since the clutch slipped, I've been pretty much off the gas. I have no technical basis for this conclusion (well some) but I wouldn't go past a 55 shot especially without EGT or A/F gauges. For someone with nitrous on a Legacy wagon, I am a conservative person and I want my car to last a long time. I think modern cars are built to be balanced. No component is much stronger than it absolutely needs to be. Given that the clutch slipped on a 55 shot, fixing that and moving up would stress something else. I don't want to chase problems around. The 55 shot is a very noticeable kick especially at first. You do get used to it though and that's when you have to resist temptation. Or not.
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Old 06-04-2003, 04:25 PM   #21
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Do they take them to a carquest in albany? No one fills bottles around here, they all get sent up to hollywood in salem. So when I want a fil it's a 3-4 hour round trip.
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Old 06-04-2003, 10:39 PM   #22
kturner
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Yup, I checked a few weeks ago and the Corvallis store says they're still filling them at the Albany CarQuest. I have been to the Albany store and they've filled 'em while I wait. It takes about 20 minutes. If you have a CarQuest in Eugene, maybe they can put your bottles on their truck and turn them around in a couple days. I haven't had any trouble with that from Corvallis.
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Old 06-05-2003, 02:14 AM   #23
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You guys seriously have to ship your bottles off for a couple days to get 'em filled?

Check some local non-chain speed shops. I can think of 4 places in town that fill while I wait.
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Old 06-05-2003, 03:04 AM   #24
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surprisingly nitrous is not really that popular around here... might be that way in oregon.
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Old 06-10-2003, 03:52 PM   #25
Impreza2000
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I got my ZEX system the other day, I popped the trunk to see what it was going to look like and where I was going to mount the bottles. The spare tire cavity was posing as a problem. Well, one thing leads to another and now I am in the middle of a complete trunk compartment remodel in blue vinyl. I will post pics, when it is finished, by this sunday if everything goes smoothly.


I am almost ready to actually install system. Is the vacume line to the fuel regulator one of the two lines going into the intake manifold on the passenger side. One goes to the cruise control and the other goes to what looks like a fuel regulator type thing...
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