Injector Questions

[All Show]

I am looking to install a Zex kit on my Civic and I was just wondering if all Honda injectors that are from a OBD1 or OBD2 are plug and play. I think I have a line on a set from a 2000 Honda Accord 2.3 Vtec and was wondering if they would work on my 99 civic. Also what size would these injectors be?

[TurboEF9]

The more important question is, why would you think of buying them if you don't even know what size they are? ..let alone if you need them. Call ZEX. See what is required for the kit you're planning on buying. I remember ZEX kits used to run on stock injectors, and had an "NMU" (Nitrous Management Unit) that basically had an FMU built in that would increase fuel pressure during nitrous opertions. If you added larger injectors while doing this, you'll flood yourself out, thus losing power.

..but to answer your question, yes, they are the same.

[All Show]

Why would you think of buying them if you don't even know what size they are?
As far as why buy them if I don't know what size they are, well there is 2 reasons that I can think of. First being I think I need larger injector and I am sure that a 2000 Honda Accord with a 2.3L Vtec engine would have larger injectors than my 99 Honda Civic with a 1.6L non vtec. Second being I can get a real good deal on them but I don't want to buy them if they are not plug and play.

I could be wrong but I beleive that with a 85 shot of NOS the stock fuel pump and injector (240cc/min) can not deliver the proper amout of fuel required to give the correct air to fuel ratio causing my engine to run lean and ultimately running the risk of blowing up my engine. I could be wrong about this so yes I need to do a little more research on this.

If anyone knows if I should upgrade my fuel pump and injectors let me know and if any one knows the answers to the question to my first post please write.

[B]

I could be wrong but I beleive that with a 85 shot of NOS the stock fuel pump and injector (240cc/min) can not deliver the proper amout of fuel required to give the correct air to fuel ratio causing my engine to run lean and ultimately running the risk of blowing up my engine. I could be wrong about this so yes I need to do a little more research on this.

ya your right. With a stock fuel pump and stock injectors there is NO WAY, your fuel supply will be capable of keeping up. As far as what injectors you should use. Have a look under "general tech" theres a "sticky" on injectors.

Goodluck!

[B]

[quote]I could be wrong but I beleive that with a 85 shot of NOS the stock fuel pump and injector (240cc/min) can not deliver the proper amout of fuel required to give the correct air to fuel ratio causing my engine to run lean and ultimately running the risk of blowing up my engine. I could be wrong about this so yes I need to do a little more research on this.

ya your right. With a stock fuel pump and stock injectors there is NO WAY, your fuel supply will be capable of keeping up. As far as what injectors you should use. Have a look under "general tech" theres a "sticky" on injectors.

Goodluck!

[TurboEF9]

Call me crazy, but your best bet is to use your stock injectors, and an FMU (that should be in the nitrous control unit).

Think about this...

Nitrous has two positive performance characteristics, which is why it's used in the automotive industry: A) Increases the amount of oxygen in the chambers, and B) Increases the density ratio of the intake charge by decreased air temps.

Now, as the law of automotive power goes, Air + Fuel + Spark = Power, you would think, larger injectors, better fuel pump with nitrous would be ideal, right? I say, wrong. And let me explain why...

Nitrous isn't an "always on" oxygen source, like a turbo or supercharger. It's only activated when you push the button, or have the WOT switch activated. Now, add your larger injectors to this equation. What is going to control them when you don't have the nitrous flowing? Your ECU.. and unless your ECU's injector pulse widths are tuned to the larger injectors, you're going to run pig ass rich anytime you're not on the nitrous.

I believe this is the theory behind ZEX using an integrated FMU in thier nitrous management unit. It can tell based upon the flow rate of the nitrous through the NMU that the fuel pressure would need to be increased to apply the right amount of fuel for the jetted spray. While increasing fuel pressure to compensate for increased density of a positivly pressured manifold is not ideal, it will work for nitrous setups, and has effectively worked for ZEX systems.

..again, I would just call them and ask thier sales reps what they recommend for fuel management. I don't believe they'll recommend the larger injectors. Pump maybe, injectors, I *highly* doubt.

[transzex]

even with 100+ psi fuel pressure, so much that you BLOW open the stock 240 cc/min injectors, you cannot supply enough fuel. 75 shot is walking a thin line.

BTW the ZEX NMU is so simple, just a pretty box.
You "bleed" off some of the nitrous line pressure to hold shut the FPR diaphram, there by "spiking" the fuel pressure.

With the larger injectors (325 cc/min) you are able to run a more normal fuel pressure and REGAIN control over them. Something you should understand bu using "turboedit".........

BTW if you call, you'll be talking to Joey Copeland, zextech@zex.com

[B]

first of all you really should listen to Mr.bone aka Tranzex. He has learned all this the hard way.... This is the reason I chose not to put a dry kit on my car. The fuel injector is there to supply fuel when the motor is running N.A. ask it to do too much and its likly to fail when you need it the most. So for a lil bit more money and lot more work I installed a direct port fogger kit, now each cylinder has its own fuel supply and is adjustable...
Goodluck with what ever you do, but remember that everything has its limitations and nitrous isn't very forgiving. :twisted:

[TurboEF9]

With the larger injectors (325 cc/min) you are able to run a more normal fuel pressure and REGAIN control over them. Something you should understand bu using "turboedit".........


..yes, but without modifying the ECU's injector pulse widths (which is he not mentioned in this entire thread) you'll be pulsing 325cc injectors at 240cc pulse widths thus, flowing 26% more fuel per pulse at the stock fuel pressure. Thus, killing your "non-nitrous" driving due to the fact that your oxygen content is now ambient, but you're flowing fuel as if it were nitrous enriched.

..by the way, I don't just "use" TurboEDIT, I'm the author of TurboEDIT, but I don't see how my software has anything to do with this thread.

[oscarmayer]

you should NOT run anything more than a 75shot and that's pushing it on stock internals on a civic motor. you really need to rethink your ideas. if this is your daily driver, can you take a chance on ruining the engine? your headed that way right now by the way it sounds. Yes it's your car and no one is telling you what to do, but you asked and I'm saying don't do it.

[All Show]

Thanks for all the help but unfortunately I am more confused than when I started but I think that is a good thing. I guess I need to rethinks a few thinks, maybe I will go with a smaller shot that I had planned. It wasn't nearly as simple as I once thought it was going to be.

[oscarmayer]

Your going to need a better fuel pump, an adjustable fpr. I would more recommend a wet shot over a droy shot anyday. dry to me shoudl only be used up to 50-55 shots nything more really should be a wet. can u use a dry for more? yea, but i don't recommend it.

[Toddnos]

even with 100+ psi fuel pressure, so much that you BLOW open the stock 240 cc/min injectors, you cannot supply enough fuel. 75 shot is walking a thin line.

BTW the ZEX NMU is so simple, just a pretty box.
You "bleed" off some of the nitrous line pressure to hold shut the FPR diaphram, there by "spiking" the fuel pressure.

With the larger injectors (325 cc/min) you are able to run a more normal fuel pressure and REGAIN control over them. Something you should understand bu using "turboedit".........

BTW if you call, you'll be talking to Joey Copeland, zextech@zex.comwith my upgraded fuel pump, my FP jumps to around 100 psi when activated.......is this bad? are my injectors(stock) being damaged?

[Bindegal]

Just to confuse things even more.
Double the fuel pressure does NOT equal double the fuel output.
(if I remember correctly)double the fuel pressure gives you 50% more fuel output.

What this means is that to run a dry system you´re running a plain silly high fuel pressure....

That´s my $0.02 anyway :D

/Bindegal