If you want, you can get these injectors and not need a custom tune:
http://www.fiveomotorsport.com/fuel-...rs/?itemid=108
19 lb/hr 4 hole disc design. Better throttle response and atomization. They are the same resistance and impedance (high) as our injectors.
Cheaper here though:
http://fuelinjectorconnection.com/sh...d&productId=81
^^ Also the site that sells those injectors is the same shop that made the video below.

Featured in this video:
http://www.youtube.com/watch?v=Emnax2J4FX4
Best atomization of the bunch. I have the ones on the LEFT in my truck...so with all that gas, you can see why I needed a custom tune. This is the flow rate at 49 PSI.

 

Good info thanks. You don't know the pressures for the years do you?

 

Ugly, I am pretty sure that they are all 49 PSI. My 1996 and 2001 were identical.

 

I wonder if injector spec sheets show a volume vs pressure graph...since I'm OBD1 (edit and I should add not ready to contact B&G about my current stepping stone combo) I think I'd need the graph to consider anything but stock injectors. Maybe a call to the factory is in order for me. Ask some apps sales dude at Bosch or somewhere if they could hook mye up with a model "3" or something equivalent that would work in my rig without a reprogram. Give me some modern spray characteristics at stock volumes , pressures, duty cycle/s.

 

94 and 95 are 39PSI.


I believe the actual dodge parts books states that 94-95 injectors are rated at 24.6lb/hr@39PSI. You'd need aftermarket injectors rated at 26lb/hr@43.5PSI to match them.


Basically, unless you know what you're doing and have a way to tune it, don't fix what isn't broken.

 

Well there it is! Not to question the data but just curious how you arrived at that conclusion.

You got that right. It's always amazing how involved this stuff can get even in a completely lateral move like this injector swap would ideally turn out to be if everything went perfectly. Any ideas on good 26# candidates?

 

A member on the Dakota forums posted this up a while ago

 

I guess what I really meant was: What is the correct way to do the conversion to know what an injectors output is at 39psi is when all the info you have is for example it's a 26#/hr at 43.5psi? Is there a chart you refer to or is it some conversion formula?

 

see, this is where injectors get deep, as I was saying..

lets say TWO injectors are rated 22.5# @ 43.5psi.. which would lead you to believe, using the conversions we would assume is constant, you would be 25# @ 49psi.. (I'm not saying that is accurate, I'm just using that as an example)..

lets say one of those injectors uses a tiny valve that opens 3/4 of the way @ 43.5psi, and, in effect, leaves a little wiggle room for greater flow IF the charge on them is greater (in terms of volts) and the psi forces the valve open 100% of the way when the tiny valve is released.. lets say THAT injector allows for 25#'s in those conditions..

The OTHER injector, let's say is opening @ 100% @ 43.5psi, and is constrained to tighter tolerances as far as voltages go.. We don't know HOW much is going to go through that thing.. It may be a ton more, or it may be a lot lesser..

The only way to know is to test them like in that video.. some injectors will lose their atomization characteristics under greater pressure and just stream fuel.. some will just make a bigger/wider cloud of atomized fuel under greater pressure..

Choosing the right one is a dang JOB...

The easiest thing to do is to use the OEM ones.. A little risk is involved in using others rec'd by actual users.. a LOT of risk is involved by using printed specs alone.. If you're too rich, you are going to blow pretty little holes in your pistons...

I say all of this, and my intent is to install 22# injectors this afternoon, that landed at my door earlier this week.. I did some studying on it though, and feel fairly confident that I'm going to be okay.. I went with the 4hole mustang OE replacements.. It should be good.. we'll see..

 

Injector flow ratings are NOT consistent. Different companies use different specs. To really know what is going on, we would need to know what pressure the injector is rated at, and what DUTY CYCLE. (which I think Drew was also addressing.) a 24 pound injector rated at 80% duty cycle is going to last longer than a 24 pound injector rated at 100% duty cycle. (Duty cycle is the percentage of time the injector is open.)

Not everyone publishes the specs for just how their injectors are rated. (at one time, very FEW of them did, its getting better.... but, still has a ways to go.)