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Old 06-05-2000, 08:46 AM   #1
RSRacer
Scooby Newbie
 
Member#: 1302
Join Date: Apr 2000
Location: Vienna, VA, USA
Talking ZEX Kit in 2.5RS

Well, the ZEX kit is finally in my 99 2.5RS! WOW! It's awesome! And it seems very well-controlled - no detonation, no funny sounds, though I did have a leak in the line the first time I hooked it up. I fixed that promptly with thread seal tape, and the problem was gone. The included vacuum lines w/ hose clamps work perfectly for connecting the controller to the fuel pressure regulator.

So, a nitrous kit designed for a Honda (Civic/Prelude) can easily be installed on a 2.5RS. It took me two afternoons, working until fairly late (1AM-2AM), only because I was taking my time. It shouldn't really take more than a single afternoon to install.
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Old 06-05-2000, 09:54 AM   #2
TamiyaRS
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Member#: 629
Join Date: Dec 1999
Location: Newport Beach, CA
Post

I have considered installing nitrous on my RS numerous times, but did not want to be the first one to do it. How much are you squeezing (how many hp)? Are you running a stock clutch, and if so, are you experiencing any slip?

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Old 06-05-2000, 10:17 AM   #3
RSRacer
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Member#: 1302
Join Date: Apr 2000
Location: Vienna, VA, USA
Talking

I am running the 55 shot, but I am going to try the 65 shot later today. No mechanical problems whatsoever yet. I did have a leak at first, such that when I sprayed, the gas would spray out of my hood scoop! That was due to a fitting that I forgot to seal with tape at first - I have my controller mounted centered at the top of the firewall, under an open hood scoop. I really need to put a waterproof cover on that box...

I have the Minnam intake tube, which I was able to easily drill and tap. You would need to drill a 1/4" hole in the intake, just before the bend. The ZEX kit comes with a tapping tool! It was very easy to tap the hole, and the fogger went right in and holds a seal with no tape (I think the actual fogger piece did a little bit of its own tapping to the hole =). Every other gas fitting in the system needs thread sealant tape.
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Old 06-05-2000, 10:32 AM   #4
Kyle Paton
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Member#: 1184
Join Date: Mar 2000
Chapter/Region: South East
Location: Brooksville, FL
Vehicle:
2012 Impreza
Dark Grey Metallic

Post

What additional fuel delivery or timing did you need to do?
And where did you buy it and how much
Thanks
Kyle
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Old 06-05-2000, 10:44 AM   #5
RSRacer
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Member#: 1302
Join Date: Apr 2000
Location: Vienna, VA, USA
Talking

The ZEX controller is a self-contained little box, and has two vacuum connectors on it. One goes to the vacuum source (intake manifold), and the other goes to the fuel pressure regulator. The unit acts as a pass-through fuel pressure riser by using bottle pressure measurement to determine how much to up the vacuum going to the FPR. The FPR ups the fuel pressure based on the amount of vacuum. So the ZEX kit takes care of fuel delivery, and unless you are using the 75shot jets, you will not need an aftermarket fuel pump. You will be fine for the 55 and 65 shot jets.

As for timing, I haven't adjusted it at all. The stock timing settings are fine for the kit. There is absolutely NO detonation, thanks to the precise fuel pressure control of the ZEX controller. It's awesome!

I got mine locally, in northern Virginia. I paid $515 for the kit, but it doesn't come with a bottle pressure guage, which I paid an additional $45 for. This kit is the greatest thing to happen to EFI-based nitrous injection!
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Old 06-05-2000, 02:17 PM   #6
RSRacer
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Member#: 1302
Join Date: Apr 2000
Location: Vienna, VA, USA
Talking

I wish I had access to a dyno and some equipment like a GTech Pro! I don't tho, so I can't really post any stats. All I can say is, "WOW!". Just floor it and the car doesn't hesitate any more at ANY spot in the revs. I have actually gotten the wheels to slip while moving, which takes some serious power in an AWD vehicle!

If you're considering Nitrous Express, don't. They're kits are weak in comparison with the ZEX - The ZEX has the controller module that takes care of everything for you. That's definitely the way to go for somebody like me, that wants to keep things simple. It's also much safer with the controller regulating fuel pressure with reference to bottle pressure. And only triggering when you have the gas pedal to the floor, that increases the safety of your engine. It doesn't let you make a mistake that could cost you quite a bit of money and time.

The only time I have ever been more impressed with the results of a nitrous system was in a friend's 86 Rustang GT w/ a 200-shot! That was wild...
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Old 06-05-2000, 02:19 PM   #7
ColinL
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Member#: 114
Join Date: Jul 1999
Chapter/Region: MWSOC
Location: Wichita, KS and Whoring, OT
Vehicle:
'03 Evo, Rice White
'01 Erion CBR 929

Post

200HP shot? Unless that was a purpose-built nitrous motor, I'm sure that one ended badly.
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Old 06-05-2000, 02:47 PM   #8
RSRacer
Scooby Newbie
 
Member#: 1302
Join Date: Apr 2000
Location: Vienna, VA, USA
Talking

It was purpose-built. The engine was completely built from aftermarket parts, and the thing had a dual-plate clutch. It did eventually meet its demise, however, when he wrecked it into a tree. So, I guess it did end kinda badly!
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Old 06-06-2000, 01:03 AM   #9
SCOOBYSHAG
Scooby Specialist
 
Member#: 358
Join Date: Oct 1999
Location: Dallas, TX
Vehicle:
2005 Xterra
Grey

Post

post some performance numbers if ya can!!

dyno?
0-60?
1/4 time?

also considering nitrous.....thanking of either zex or nitrous express.
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Old 06-06-2000, 11:45 AM   #10
RSRacer
Scooby Newbie
 
Member#: 1302
Join Date: Apr 2000
Location: Vienna, VA, USA
Angry

Okay, first problem I have encountered: Fitting leaks. The ZEX controller started to leak out of the nitrous line fitting (going to the bottle). I have tried and tried to get it to stop, but can't. I have talked to ZEX tech support, and they just told me to send the controller back to be repaired. I think this sounds like a design flaw - The fittings shouldn't just start leaking out of nowhere. All the teflon thread tape in the world won't get rid of the leak that my controller has sprung.
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Old 06-06-2000, 03:59 PM   #11
N/A
Scooby Specialist
 
Member#: 133
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Burlington, WA
Vehicle:
TBA TBA
TBA

Post

I've seen teh Zex kit hooked up only once before but it looked like a very straight forward install. There also ins't any need for the extra wiring, hoses running all over the engine bay. I'm still not brave enough to run it in the daily driver. Good luck and hope the problems get cleared up.
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Old 06-06-2000, 05:20 PM   #12
SCOOBYSHAG
Scooby Specialist
 
Member#: 358
Join Date: Oct 1999
Location: Dallas, TX
Vehicle:
2005 Xterra
Grey

Post

Update us as soon as you can on the leak problem!!!!
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