do they? and if so how well?

http://www.zex.com/store/merchant.mv?Screen=CTGY&Store_Code=ZX&Category_Code=EAA

they work, but for 100 extra bucks its not worth it, a simple hole in the intake tube would be fine. theres no reason for that.

u agree. unless you want show really bad, put a hole in the intake.

what kind of gains could i expect

well it is a nitrous kit, so depending on the jets u choose, zex makes a wet kit for the focus and the jets start at 55 shot. so about 50 hp or so, with the full set up with that filter u are looking at about 700 bucks

anthony

theres also a mount that goes on the end of the fuel rail i believe....

Originally posted by mofocus
theres also a mount that goes on the end of the fuel rail i believe....


i have seen this also, can't find pics though.

i know mcnews has it

Just to clarify, this is for a DRY kit, as it is only injecting Nitrous, no fuel. I would recommend a wet kit for several reasons..

Get a wet kit and for what that thing Costs I would save a lil more for a remote bottole opener

I know that a wet kit sprays nitrous as well as fuel, whereas a dry kit is just nitrous, but how does the wet kit shoot the fuel, obviously it has to tap the tank, but does it have it's own pump? Or computer that knows how much fuel to add with the nitrous, sorta like a completely independant fuel system? Does the fuel get sucked out cuz when the nitrous sprays it creates a vacuum? Tell me! Sorry if some of these questions seem dumb.


Also when you shoot dry, how does the ECU know to add fuel? I mean I know there's a MAF that reads how much air is passing but how does it read the nitrous? Wouldn't it kinda [:)][:)][:)][:)][:)][:)]* with the MAF sensor? Wouldn't it cause the engine to run lean because the nitrous is either not being accounted for, or even worse covering up some of the air that the MAF sensor would have seen but the nitrous hit it instead, cuz I realize that the MAF reads a small percenatge of the air, 5-10%, and then just multiplies it to account for the rest.

Anyone?

that thing isnt worth it. I would just do direct port either right to the intake manifold or the TB.

Well, that is the problem with dry kits, you don't have any insurance that the ECU will interpret the extra airflow correctly, and add corresponding amounts of fuel.

However wet kits which are configured for a certain amount of bhp-shot, which means that they probably have a fuel nozzle which is of the correct size, so when jetted, the "appropriate" amount of fuel is released...

I have no experience with these kits, just what I've read, anyone with some xp, please articulate/correct me.

Don't mean to sound rude, maybe my question wasn't very clear. but just so others can answer my question still hasn't been answered (Not trying to be rude, just stating)

Originally posted by ses
However wet kits which are configured for a certain amount of bhp-shot, which means that they probably have a fuel nozzle which is of the correct size, so when jetted, the "appropriate" amount of fuel is released...

I got down where the the fuel is being added and that it is being injected as an nitrous fuel mixture, but how the is the fuel added? What physically forces it in? Where does the fuel come from?

Ok so you say that maybe the fuel nozzle has been jetted for the correct amount. Well where does the fuel come from? Do they tap the fuel tank? Or somewhere inline? Isn't that kinda like punching the car in it's stomach? I mean if the nitrous systems takes fuel without some sort of way of telling the computer, then your kinda like stealing pressure from the fuel system, wouldn't that mess up the amount of fuel sprayed by the injectors because they are opening up for a certain period of time under a certain fuel pressure, and you are dropping the pressure. Yes? No?

I have no clue just guessing, I'm really interested as to how it works

wet kits tap off the fuel rail

Originally posted by MuDvAyNe
wet kits tap off the fuel rail

Ok, so it's tapped off of the fuel rail. My understanding is that the fuel rail is pressurized, so then wouldn't tapping the fuel rail be terrible? Because obviously the ECU isn't expecting something to just steal the pressure from the rail. So how does it work, so far I've got that it injects nirtous and fuel at the same time, how does it know how much fuel to inject?

http://www.holley.com/HiOctn/TechServ/TechInfo/NOSTech.html
here's a link that might help.

Originally posted by MuDvAyNe
http://www.holley.com/HiOctn/TechServ/TechInfo/NOSTech.html
here's a link that might help.

Read it all already. The problem is I understand everything about how it works BUT not what makes it work.

How is the fuel added? How does the ECU know to add fuel, specifically in a wet shot, as I understand ZEX kits Peg the injectors, which means the injectors are pushed to full, well calculating the Fuel Pressure on "XXXX" Vehicle, and injector size, then shouldn't you be able to calculate how much Fuel will be delivered and thus add the corresponding amount of nitrous?

But with a wet kit, the nitorus and fuel is delivered independant of the injectors, so when the fuel is injected in a wet kit, what determines how much fuel is added? Like you said the fuel rail is tapped, well that means the nitrous kit is stealing fuel from the fuel rail, which is pressurized by the fuel pump as I understand, and the fuel pump is controlled by the ECU. So the ECU pressurizes the system as you are driving normal, then all of sudden you floor it and the fuel pump pressurizes the fuel rail accordingly as well as calculating how long to open and close the Fuel Injectors for, then all of a sudden the window switch (or button, or whatever the hell) engages the nitrous, all of a sudden the fuel rail pressure drops because the ECU calculated the TPS Fuel rail pressure and fuel injector duration and now the nitrous comes along and "steals" the pressure unexpectedly, now the ECU has to play catch up to repressureize the fuel rail again and such.

That's probably wrong, but this is the kind of answer I am looking for, I have searched all over and not been able to find out how exaclty it works.

Can someone tell me?

Basically how the hell do you add the fuel without messing with the stock fuel system and not telling the ECU to do it, or how do you tell the ECU to add fuel or for a wet shot how do you tell the ECU to give the nitrous system fuel to add with the No2.

Okay, I'll try to be quick...I think I need to make a nitrous sticky....anyway.

The nitrous kit is its own system, the car runs and fuels itself in a total normal manner, when you press the button on a wet nitrous kit it supplies both fuel and nitrous through metering jets to get the right amount of each into the car.
On carbureated cars you need an electric fuel pump to supply the nitrous, this is also true on really high powered nitrous hits that may be used on a drag car, because you are using so much fuel...On our Foci with small hits, 35, 50, and 75 h.p., the fuel can be pulled from the fuel rail, basically the same in tank fuel pump is sharing the duty of supplying the injectors to the motor and supplying the fuel jet in the nitrous system. The fuel amount is small enoughthat the fuel pump can keep up ( at least for a while) and there are no problems with splitting the fuel supply this way... ..Remember the nitrous is a " stand alone" system, the cars computer doesn't even know it is there, when you spray a wet kit it does its own thing completely seperate.
This is where the problem comes in with a dry kit, the accelerated airflow "tricks " the car into going " full rich" on the fuel flow to compensate for the nitrous ( I am really simplifying this), and this extra fuel SHOULD be enough for the nitrous use, problem is sometimes it isn't or it can only handle VERY small shots...Hope that answered your questions , if not pm me and ask specific questions and I'll take care of your answers.

First I'd like yo say thank you, I'm sorry I made it so hard.

Originally posted by viney266
Okay, I'll try to be quick...I think I need to make a nitrous sticky....anyway.

The nitrous kit is its own system, the car runs and fuels itself in a total normal manner, when you press the button on a wet nitrous kit it supplies both fuel and nitrous through metering jets to get the right amount of each into the car.
[QUOTE]Originally posted by viney266
[B]On carbureated cars you need an electric fuel pump to supply the nitrous

So carbed engines don't use the regular same type of pressurized nitrous tank as EFI cars do?


Originally posted by viney266
The fuel amount is small enoughthat the fuel pump can keep up ( at least for a while) and there are no problems with splitting the fuel supply this way...

So a way to tune for the nitrous would be to get a stronger fuel pump tune/flash the chip/ECU to pressurize the fuel rail more than stock, thus having to change the injector duration (or does the computer recognize the change pressure and adjust accordingly?) But once thats done then when you do spray the pump will not be overworked and the fuel rail will drop to "stock" ECU levels then, or either way less than without it, right?