Atmos

I was gonna go to pick and pull and get my own neon injectors from a 96 and clean them up my self. worth my time?
or I could order some from the for sale section. it's more fun doing it yourself

86-Chief

Pending the price for 6..it may/may not be worth it. I would only do it if you plan to replace the filters inside & pending price on the injectors!

I know out here a single injectors goes for 6.95 each. With taxes and the enviromental fee they charge, you end up around 46 & change per set at my local year. After the rebuild and such, your probably better off buying a set online thats been rebuilt.
I sell mine rebuild at 55 a set with a 30 day warranty. Others sell at 40 & 45 but they are soaking & shipping, and I personally wouldn't trust that method.


Because of the high price at the yards, I now buy injectors in bulk! 1000 injectors for a decent price..now the issue is that around 200 injectors out of the 1000 end up not working or are broken & not useable lol.
I'll be honest and say I'm making less than 14 dollars profit on each set I sell and then that profit is split 50/50 between me and my business partner!
So by no means am I getting rich lol.

Atmos

sold I'd like a set of your 703's please. haha. I have to take care of the radiator and a couple other things but I'll have some play money soon
I have your link saved

86-Chief

Np, either send me a pm or a post in our thread and we will get you taken care of

Atmos

everyone says theyre absolutely worth it. but will I feel any difference?

86-Chief

Idle & throttle response? YES!
Mileage? Maybe 1-2mpgs
Horsepower like kick *** NOZ yo? No But I've heard stickers add a similar feeling


If all honesty, yes you should notice a difference in idle & throttle response..some people are more critics, some think they feel gains by removing the 48Cent's in their ashtray lol.
I'd tryed to be a critic on the injectors, I had almost every bolt on before I did these..I ended up running lean..popping through the intake upon hard revs, and it would miss from time-time. In went 703's at first, and yup deffinetly felt better, never missed again, no more popping.
Then I did the updated 43.5psi fuel pressure regulator vs my 39psi one..this was to spray the fuel out better, better pattern & slightly higher flow out of the injector. Then went in some Ev6 24lbs with adapters...only did Ev6 cause I had them on hand. And it pulled much better up top. Again I was trying to be a critic and I can honestly say I have felt a positive difference. And I have just about every bolt on you can imagine short of a turbo, supercharger or NOZZZZZZ.



For others reading this thread!
I don't recommend 24lbs on a stock 4.0. However on a bolt on 4.0, I personally believe they help greatly!

Lets brake it down. Stock injectors are 18.7lbs..they are running around 92% duty cycle which is dangerous! Normally you don't want to exceed 80-85% DC.
At 190hp crank horse power (stock 4.0 rating) a set of 19.5-20lbs injectors would be at 80% DC. (duty cycle)

Just to guessimate, a mild bolt on 4.0, and we are gonna be generous. High flow intake & 2.5" exhaust would be around 210 crank hp, again being generous.
22lbs injectors would be at 80% DC, so running 24lbs injectors would not be to far off!
A more modified 4.0 would need 24lbs in my eyes. Say you have a bored TB, intake, exhaust, header, maybe a high flow downpipe, relocated IAT sensor ect ect ect Your not going to use the extra fuel unless you need to honestly. But I would run nothing short of 24lbs.
I can bet the 24lbs injectors will start to get more popular around here! Everyone tells you no they are too big, but has anyone done the research? Not to say the 703's and others don't work, but again it depends on what you have done, what you will do and what fuel pressure regulator you have!

The older jeeps got a 39psi one and newer got 43.5 psi.
Now my personal prefference is higher fuel pressure, within reason of course! And you would need a adjustable fuel pressure regulator for this.
But higher pressures litteraly shoot fuel out harder & faster. This will give a wider/denser pattern. More of a mist if you will. It also will allow your injectors to flow more fuel up to a point. Higher pressure may not always equal higher flow either..for example!

These are real/accurate numbers for those reading! I've done this testing on the Ford 700/710's.
For example, a set of 19lbs injectors..say they flow 19.0lbs at 39psi. They will flow 20.8lbs at 43.5psi. They will have a slightly better pattern, but you really just gain some flow.
The same 19lbs injectors at 49psi will flow 20.4lbs but have a much nicer pattern. And at 50psi they will flow 21.7lbs again and still hold that nice wide pattern.

I have a flow bench and its deffinetly interesting to watch what happens with pressure changes! So theres deffinetly a lot that can happen and change when playing with injectors, which is why I deal with each person as a individual and let them know what would be best for them..if they request certain injectors and ignore my advice then so be it.

My business partner (dezertxj88) will be running a Hesco adjustable fuel pressure regulator on his 4.2L stroker. He will be running a set of 26lbs injectors at 54psi.

These injectors flow 24.7lbs at 39psi..so you see why I say 24lbs injectors are useful in bolt on Xj's, a set of 24lbs injectors flow 22.7lbs at 39psi? 703 neon injectors are only 21.3lbs..so no not much difference but room to grow
Anyway they flow:
24.7lbs at 39psi
26lbs at 43.5psi
27.7lbs at 50psi
28.4lbs at 52psi
&
28.6lbs at 54psi
29.6lbs at 55psi


So every injector is different..they have a certain PSI where the pattern gets considerably nicer but they don't flow much more! It takes testing & time & a flow bench lol. You can kind of see the sweet spot where the flow doesn't gain too much..Its harder to show real results without pictures lol..
But at 52psi they flow 28.4lbs & 54psi the injectors are flowing 28.6lbs, and just 1psi at 55psi they pick up a whole pound for a total of 29.6lbs.

Like the 19lbs injector example above..they flow slightly less at 48psi vs 43.5psi, but have a considerably better spray pattern! The increase in pressure isn't just to gain more fuel, its to get a nice spray pattern, better atomization ect ect.

Again you'd need a flow bench to find the sweet spot so to speak..and you'd have to decide on a certain injector. We knew from the start we could use 43.5psi and 30lbs but all that does is flow fuel, does nothing for the pattern. So we found a good 24lbs injector and just played with the pressures to get what we wanted!

He should end up with 250-260 crank horsepower. and 28.5lbs injectors will be at 78% DC at those numbers..so we are at or under the 80% like we wanted and hes got the flow he needs but with such a nicer pattern!
Think of it like this, 28lbs injectors, 43.5pis vs 26lbs injectors & 54psi.

This is why I tell people with the 43.5psi regulator that the 700/710 & 746's are sometimes a better choice depending on what they have done! At 39psi they flow exactly 19.8lbs, at 43.5psi they flow 22.1lbs. Because you still get 22lbs injectors, but you also get a nice pattern

I try to tell the guys with the 39psi regulator to use 703's because they need the bigger injectors cause they have less pressure. The 703's flow 20.4lbs at 39psi & 21.3lbs at 43.5psi.

caged

lets see some pics of flow patterns in your flow bench.

86-Chief

I will have some up in my thread on Saturday for everyone

CrawlnCoupe

i pulled some 703's off 2 chrysler sebrings (couldn't find any in the neons) monday and they ended up costing me $50. i shoulda just bought some from the forsale section

86-Chief

This is exactly why we buy in bulk now! The only way to offer these at the price we offer them with a rebuild, it buy in bulk & take the gamble that we get at least 600 working injectors.
Or to somehow "get these for free". Which I hope no one ever stupes to!

caged

kewl

Atmos

ok. I've got a 1993 inline 6 Aw4
plans for a spectre cowl induction and possibly a 99 header. then a glasspack and tip for fun
I was interested in injectors for the promise of better throttle response to (very slightly) make up for lack of gearing
that'll be my final engine/exhaust setup
all that being said which injectors would you recommend for me?

86-Chief

You have a 39psi fuel pressure reg. I believe 95+, or 96+ got the higher 43.5psi version. Anyway, with a header, exhaust, & intake..I'd say your getting close to 24lbs territory, and whos to say you may or may not grab a bored throttle body later, or DIY bore yours? Great mod!
I would run 24lbs.
Or upgrade to a 43.5psi regulator and some injectors that are rated for 21lbs @ 39psi. You will end up with a nicer pattern & around 22.8lbs all together.

Every dogs the ford 19lbs yellow sticks, (700/710) and I believe its because they are rated at 29lbs, while everyone knows the 703 is a 21lbs injectors.
But 703's are rated for 21lbs @ 43.5psi, at 39psi they only flow 19.5lbs...
The 700/710 is 19lbs at 39psi & 43.5psi they are rated at 21.2lbs.
So you see all together theres really not much difference between the 2, people just need to understand what they are buying more lol.


But yes you have 2 options.
Cheaper option - bigger injectors. 24lbs
Or the more expensive way, get the updated regulator & 21lbs injectors which would be better all around..but I'll be honest and say you not going to feel a difference between the 2..its really just if you want to spend the money or not!

Atmos

there, that should help your sales pitch a bit. lol
thanks for the education. I'll pm you for some 24lbs when I'm ready for the upgrade

86-Chief

haha pretty much just what you added lol.