Injector Compatability

[S-14boy]

Ok, so I tried searching for info on injectors for the S14 KA but still came up mostly empty handed. I was going to try to find some injectors tomorrow, but I want to know what injectors we can use that would have a higher flow rate. I found SR20DET and RB25DET is compatable@370cc, but Im sure I wont find many of those in the junk yard. And Z32 95+ @370cc will work from what I have read. But what about Q45 injectors, or J30 injectors? Are those the only ones with out going aftermarket?

[WDRacing]

The first place you should always search is the FAQ at the top of the page. There is a direct link in my signature. There is a thread there that lists all of the injectors and details about them. If you need anymore help after that, ask away. But that should do ya

WD

[S-14boy]

zerothread?id=109492

Is that what your talking about. Because I did see that before I posted and I didnt know if that was just a list of injectors or if that is a list that will fit in KA.... Is that a list of injectors that will fit KA with no mods?

[WDRacing]

see where it says, "Nissan KA24DE Side feed 270cc High S13/S14" ? That means you need side feed high impedance injectors. Scroll through the list and find injectors matching that description and you're golden. If you want new, then visit here Deatschwerks they have everything you'll need and at a great price. I'd opt for new if given the choice.

WD

[nismo_power]

so will the rx-7 (fc) injector fit into the kade fuel rail with no modifications???

[S-14boy]

So, any of those will fit as long as I match up the impedence and the feed style?....I would opt for new too, but its not for me. I have 370RC top feeds I got with the GReddy kit.

[WDRacing]

Yes, I just gave S13FX a set...

[WDRacing]

If you have 370's why do you need new injectors?

[S-14boy]

Theyre not for me.

[nismo_power]

im taking about the 86-87 rx-7....i this set (Mazda FC NA Top feed 460cc Low 86-87) and this set (Mazda FC turbo Top feed 550cc Low 86-87) will either one of these sets fit into my kade fuel rail without any modifications...is that what u r telling me???even though the FC injectors are top feed and the turbo being low independence...non of this matter???thanks...

will these also work for the sr fuel rail since the sr injectors will work for the ka fuel rail???
Modified by nismo_power at 7:36 PM 1/31/2007

[nismo_power]

hmmm...am i doing something wrong cause i took the old one off and the fc injectors dont seem to fit???

[WDRacing]

Ok, you need to slow down and actually think this out rationally. The KA24E motor uses top feed High impedance injectors. Its not the turbo thats high imp, its the injector. Its a matter of what voltage it requires to drive the injector that makes it high or low impedance. I don't think you understand the differences in fuel injectors. Which is no big deal, other then you're not listening to what I tell you.

Here's the deal. Your motor requires topfeed injectors. It requires them to be high impedance injectors. So you go through the chart and see if the other cars match those requirements. The 86-87 FC NA 460cc injectors are low impedance, so they won't work. The 88-91 NA FC 460cc injectors will though. Because they are high imp. The 88-91 turbo FC 550cc injectors will also work.

Buy the 550's and be done with it, they are a drop in for the KA24E rail. Thats why I said they would work a couple posts ago.

I'm not going to answer the SR question. I want you to go through the chart and tell me what you think. That way I know if you're getting this or not. Consider it turbo 101 homework and I'm Professor WD

WD

[nismo_power]

so it looks like they wont work for the sr...but i asked u if they will work for a kade not a kae....so they will not work for the kade either because the are top feed???

so will the kae fuel fit in the kade???and r they the same sizes???

[S-14boy]

nismo_power:

Hey if I am reading the chart right the following would work for the KADE:

Nissan KA24DE Side feed 270cc High S13/S14Nissan SR20DET Side feed 370cc High S13/S14Nissan SR20DET Side feed 480cc High S15Nissan RB25DET Side feed 370cc High R33/R34Nissan VG30DETT Side feed 370cc High Z32

NOTE: 90 - 94 Z32 uses a style of injector that is non-compatable with KA fuel rails (still sidefeed), while 95 - 96 uses the same injector as the RB25DET and SR20DET, etc.

Mazda FD Side feed 550cc High 93-98Mazda FD Side feed 850cc High 93-98Mazda 20B Side feed 550cc High JDM Mazda Cosmo?

Subaru JDM STi Side feed 550cc (565cc?) High pre 99Subaru STi Side feed 565cc High 03+

Toyota Celica GTS Side feed? 310cc High 2000+Toyota JDM 2JZ-GTE Side feed 430cc High?* Supra mk4 turbo

WD correct me if I am wrong

[WDRacing]

You my friend have nailed it. The only injectors I'm unsure about are the Toyota ones. The specs match, I just don't know if they are direct drop ins.

Good job

[S-14boy]

WD:

You said "The specs match, I just don't know if they are direct drop ins." I assume you are refering just to the Toyota ones?

[WDRacing]

All of the ones you listed are direct drop ins, excpet the Toyota injectors. I can't say for sure because I don't know of anyone who has used them. I wouldn't want to recommend the wrong thing.

If I were you, I'd try for a set of 370's from a 300zx, SR20, VH45 and I believe the VG in the Maxima.

Another note, change the orings and use petroleum jelly on install. This will keep you from cutting orings.

WD

[hannibal]

nismo_power, I think WD thought you were asking about injectors for the KA-E. The FC used top feeds and will never drop into the KA-DE's side feed rail. If you have a DE, you need an injector from the list S-14 posted. Like WD said, try to find a Nissan injector cause he knows they will fit.

I forgot the VH had 370's. Prof WD, can you add that to the list when you get a second?

[WDRacing]

Why yes I can

[nismo_power]

thanks...i got it know...so what year maxima runs the vg with the 370s that i can use???

[babowc]

i have one question:

do resistors change the voltage?for instance..KA24DE requires SIDEfeed and HIGH imp.however, if i were to get a TOPfeed rail and 440cc DSM injectors which are LOW imp, could i change the impedence by wiring up a resistor? and would that have to be 1 resistor PER injector?

[nismo_power]

is there any top feed rails i can get so that it will fit the kade???

[hannibal]

is there any top feed rails i can get so that it will fit the kade???

No OEM rails that I'm aware of. I think WD tried the 4.6L Ford rail and it didnt fit well enough. You can go buy a top feed rail for the KA-DE from a dozen different places. They usually cost $100+. Theyre simple to make if you have access to the tools. Because theyre so expensive, I'd rather just buy side feeds and drop them into the stock side feed rail.

i have one question:

do resistors change the voltage?for instance..KA24DE requires SIDEfeed and HIGH imp.however, if i were to get a TOPfeed rail and 440cc DSM injectors which are LOW imp, could i change the impedence by wiring up a resistor? and would that have to be 1 resistor PER injector?

Short answers:No, yes, and yes...

Long answer:Resistors dont affect voltage, only resistance. The formula is E=I times R, where E is voltage (constant 12 volts), I is current, and R is resistance. Since voltage is constant, raising resistance lowers the current and vice versa,\.

I think you will need one resistor per injector. I dont know exactly how to wire them up or what value of resistor you need, but its been discussed on here before.

And while there is some scientific difference between impedence and resistance, they are basically two words for the same thing.

Your ECU expects the injectors to have a certain level of resistance (11-14 ohms I think). If you switch to low impedence (2-5 ohm??), the injectors will receive too much current. Thats why you gotta add the resistors, so the circuit sees the total amount resistance required (and therefore the correct amount of current).

[WDRacing]

Actually, the $.6 Mustang rail worked really well. In fact I bought a set of Aeromotive rails for the 4.6 and fabbed my own mounts out of adel clamps and spacers. One injector will be at an angle, but I never had a single leak. I never tried a stock fuel rail, on the aftermarket version. I know one member used a 4.6 rail in stock form, but again, you have to fab mounts.

Its also very easy to make your own rail. Just buy fuel rail stock, drill some holes and attach some mounts. But I think thats a tad out of reach in this thread.

There are lots of aftermarket fuel rails for the KA. AMS makes a really good setup.

[babowc]

yes,the thing is, i already have the ProjectSilvia fuel rail.i think these take dsm injectors.. but again, dsm injectors are low imp.

i need to find out how i can get these to work just got internals for my spare block.. so time to get the big ball rollin!

[hannibal]

Wow! Just went to check to price on that rail. Its $38 which is much cheaper than Ive ever seen.http://www.projectnissan.com/s...=3701

Also, from the bottom of that page...Q: Will this fuel rail fit 50 or 72 Ib msd injectors. And can i have fittings for a fuel pressure reg to put on it. A: We designed our fuel rail to be used with the JDM Denso Fuel Injectors Top Feed with supply port diameter of .420 inch fitting into a fuel rail port diameter of .428 inch. The MSDs are based on the .520 and would require a .528 to fit. Our fuel rails are made of aluminum billit, so it can be machined out to fit the .520, but we do not have it premade for that particular spec. We recommend the use of an aftermarket Fuel Pressure Regulator as SARD, NISMO, etc.

I think Mitsubishi uses the smaller size (same as Denso)...

Hey S-14boy, Im gonna email you a quesiton about your climate control...

[babowc]

oh wow..38 bux for it? w/ free shipping.. haha wtf.i feel stupid.. i bought this and a btm for 160...

[nismo_power]

is that the actual pic of how it will look...i dont get how thats suppose to work am i suppose to use me stock rail still???

[hannibal]

take a deep breath and repeat after me: top feed OR side feed...

You can drop side feed injectors into your stock side feed rail til the cows come home. No other parts are needed. Side feed injectors and side feed rails go together like peas and carrots.

You can switch to a top feed fuel setup if you like. You will need a top feed rail and top feed injectors. You can use OEM top feed injectors (from a Mitsubishi or others) or you can use aftermarket top feed injectors (like MSD's). Top feed injectors and top feed rails go together like umm, spaghetti and marinara sauce.

Brian, thanks for the clarification on the Mustnag rail. Having to fab mounts for it puts me (and other guys without those kinda tools) back in the same situation. Knowing that the ProjectSilvia rail is so cheap, thats the only way I'd consider going top feed.

Babowc, let us know how that rail fits when you get it installed. Seems like a helluva bargain. Even at the price you paid, its still half as much as other top feed rails.

[WDRacing]

It actually looks alot like my aeromotive rail. See the "stands" in the picture, they are just aluminum spacers you can get at home depot. I use adel clamps you can get anywhere to mount the rail to the intake manifold with a long bolt, with the spacer in between.

But aeromotive rails are expensive and you get two of them. That Silvia unit is pretty sweet for under 40 bucks.

WD