Here's what I have 93 A4
Dana 44 with 3.73's
2200 stahl
Headers
FLowmaster 40 series
cut lid @ K.N. filter
Air foil
mild cam
I want to add a 100 shot dry system and I have many questions
If I buy the Zex kit with the digital controller what else do I need ?
I want to do this however I want to make sure I do it right the first time. I also want to make sure I have enough money to pay for everything. I was thinking of buying the Zex kit and a bottle heater, purge kit and an A pilar guage pod for fuel pressure and nitrous. What am I forgetting ? How much should this whole thing cost ? I am planning on doing the install myself. My car is in excellent running condition and has all new plugs, wires, coil, opti, waterpump new fluids and filters. Your advice would be appreciated. Another question I have
is how do you use your nitrous ? I can't use anymore power from a dig
so just spray it through second and third gear I guess ? How does that work though ? I thought the nitrous was on at W.O.T. ?? What do you do arm the system just before use or can you spray it manually ? Thanks, John

 

I'm not familiar enough with the Zex products to know what all comes in the kit. Do you have a link? How does the system add the extra fuel? With a fuel pressure spike, or does it utilize the MAF sensor?

With a dry kit you don't need the purge. If you purge before you spray the hit will come on harder with a dry kit. With no purge, the hit will be a bit softer, hence easier on tires and other driveline components. Bottle pressure is also not as ctitcal with a dry system. An 'A' pillar mounted pressure gauge is probably not necessary, the gauge on the bottle should be plenty.

There's no way to know what all you are forgetting with out a list of what is included in the Zex kit. We need that link. A top of the line install, with all the bells and whistles could come in at $2,000+ pretty easily. On the other hand, you could do a bare bones set-up for less than $500.

I engage mine on the hole shot, but I am running a set of M/T ET street radials. There are several conditions which must be met in order for the juice to flow. You need to be at WOT, the arming switch must be in the 'ON' position, etc... It doesn't matter what order you satisfy these conditons. You can launch, and them arm the system once you hit second gear if you want. Since you are already at WOT and all the other safety parameters are met, the arming switch is the last link in the chain. Once you flip it, the juice comes on.

Here's a long write up I did on the bottle, and a bit about installing it in a 91:

http://temp.corvetteforum.net/c4/vader86/nitrous.html

Let us know what you come up with!

 

www.zex.com part number 82018 is what I'm looking at.


I would appreciate your opinions on this kit greatly.
Great write up on nitrous, good reading and answered alot of questions

 

I am going to be this post. That kit does look very appealing to me as well. One thing I believe you will need is a safety blow off tube and according to their instructions, bigger injectors, and I would assume either a tune for it or boost retard of some type. (says to use stock chip if you have a modified chip) It appears it is designed more for a stock engine but will work on a modified engine with the above changes, ie, tuning, and injectors.

 

I am no expert, but maybe I can assist. I have the Zex kit installed in my 95. I bought it on ebay from a shop in Mississippi at a really good price. I upgraded my injectors to Ford SVO 24# racing injectors to handle the increase in fuel required. The Zex kit comes with an in line fuel booster that is mounted in the rear of the car. You may want to change your fuel filter and check the fuel system pressure to be safe. If you can get a good price on it I would buy the extra package that comes with the purge, bottle warmer, psi gauge, and blow down tube. I ended up having to buy all these things later on, individually, at a higher cost. If you plan to ever use it on the street and it's mounted in the rear you may want to consider adding a remote bottle opener. I can reach over to mine in the Convertible. You will also need a custom Tune to take out some timing. I have two Tunes from PCMFORLESS. One is to be used with N2O the other is for no N2O. I can switch between them with my laptop in just a few minutes if I ever need to. I usually leave mine on the N2O tune and just deal with a slight HP loss if I'm not spraying. A different route to take would be to buy an MSD box to change the timing. The new MSD Opti's can also change the timing. I believe that it is for every 50hp shot you need to retard the timing 2 degrees. Maybe someone else can verify that. I believe my timing is retarded 6 degrees for my 125hp shot. You will also need colder spark plugs. I went with the ZEX since the Kit was probably designed with their brand being used. So far I have had zero problems with them. I'm sure that NGK or Autolite would work fine also. I plan on adding the Pillar gauge to my set up. I don't like having to get out the car, walk around, and pop the vert hatch to see what my PSI is. It is easier and more convenient to diagnose pressure issues from the drivers seat. I installed the switch between the power seat controls. The purge switch is installed by my alarm reset button, by the steering column and digital dash. I'm adding a line lock and bottle warmer so I'm thinking of adding a custom plate for extra switches on the side of the center console. I only launched off the line once or twice. Traction is an issue with street tires. It only activates with the switch on and the pedal pressed all the way down (WOT). I typically floor it and flip the switch on after I am moving forward a few feet. This helps with traction until I can get stickier tires. It also makes it more difficult to break things. It is definitely the most enjoyable upgrade I have done so far. It feels like a totally different car on spray. Refills are about $40 and it doesn't last more than two minutes a bottle if I remember correctly. My setup probably ran around 2k for everything with install. I'll see if I can post some pictures later.

Good luck

Edit: I just noticed you have a chip instead of an EPROM. You should be able to replace it with a custom N2O programmed chip or use the stock chip with the MSD box. I believe there may also be a setup that lets you reprogram the chip on the fly. Not 100% sure. Check out moates.net or email one of the forum tuners.

Here is a shot of the intake with the nozzle installed in the smooth air duct.


Down there is the management box. It is strapped down to the front cross frame rail.


There is a shot of the management unit and the purge solenoid.


Here is a picture of the bottle mounted in the convertible hatch area. I actually still have room for my 8" bass tube if I wanted to leave it in. I also have a black velvet bag that covers the bottle, it looks real good. I am not a big fan of bright purple. The bottle warmer is not in there yet. Maybe this weekend. I got the one that connects to a 12V source. They have a different one that will go to the cigarette lighter but I don't like visible wires hanging around.


Here you can see the blow down tube that exits the car through the floor. I also have the PSI gauge but it's pointed the wrong direction to see from the drivers seat, and it's too dark at night. A pillar gauge will be in there soon.


The activation switch is mounted here. I'm going to make a custom plate that will mount to the left of the center console shown here. It will be where the carpet meets the plastic, by the drivers right leg. Any other suggestions are welcome.


There is the red purge button, to the left of the alarm button.


The nozzle and 125hp jet was installed here.

 

Photos added above.

 

Hey Rick, Might I ask, where did ya get the two smooth air ducts?......thanks man.....tried to send ya a PM but your inbox was full....Joe

 

thanks, i have to empty it. Mid America

 

Rick, is your kit dry? I would assume so with your purchase of larger injectors...and with that I would have to ask 2 questions
1) why a dry kit and the cost of injectors when a wet kit is a minimal amount more $$ without needing injectors?
2)what HP shot are you running? oops nevermind I just saw a 125hp nozzle mentioned.

I agree with a majority of your advice and appreciate the time to post the pics as I'm sure the original thread creator does as well.
I see you are still running the stock MAF w/ screens. Are you planning to upgrade it? I don't really think you need to but was curious if you had looked into it. You've got all the O2 you need from the spray

 

Cool thanks , I'll have to pick a set up

 

I went with the dry 125hp kit. There are a few reason I chose a dry kit one being an easier install. I figured upgrading the injectors would help a little anyway. It took me about 20 minutes to put the new injectors in. I didnt want to go any larger on the stock motor than 125hp and a dry kit works fine for that amount. Others have reported trouble with getting equal fuel distribution with wet kits if not set up properly. I have also heard that wet kits contribute more to Nitrous burps/fires. When I eventualy go to a built 383 setup I may switch to a wet kit with a higher shot. I'm sure either kit works fine if setup right.

See the picture of my MAF screen here and explaination.
http://forums.corvetteforum.com/show....php?t=1471802

http://forums.corvetteforum.com/show....php?t=1474396

 

I just had a guy here in the shop with a Zex setup that he's not happy with.. the solenoids were doing some strange pulsing and I didn't get a chance to check the system for him. My guess was the "control box" it had was either going bad, or had some wiring issues.

My personal opinion is to use a wet system as any "hiccup" with the injector pulse width, you stand to have a major problem, especially with a shot over 100 on a dry system. The only real "problem" with wet kits is they can go overrich, but that won't cause a nitrous backfire...it'll just slow you down a bit. Dry kits can go too lean, and in simple layman's terms, "That's bad"

There are others, of course who've had no problems with dry shots, but do your research first before deciding.

YMMV

 

Like I said, I am no expert on the subject. Check out this thread here and the posts from forum vendor Robert at Nitrous Express.

http://forums.corvetteforum.com/show...rous+explosion