I am looking for some high performance fuel injectors for my 5.4 250 anyone know of any good web sites? Someone told me that you might be able to use injectors from ford racing off a 5.0 mustang is that true?

 

What's your motivation to change fuel injectors?
There is absolutely no power to be gained by changing injectors that are functioning properly. If your injectors are bad,clogged,etc..then you have a reason to change them...otherwise-you're wasting money.
JL

 

How does that figure? I would assume since he said high performance injectors that he meant injectors with more flow, if it has more flow(and he has more air to match that flow) then he should have more power. Now if he is talking about stock injectors to stock injectors then your right, but if he is talking about injectors that aren't stock(rather they be modified stock injectors as in the case of mine or totally aftermarket injectors with more flow) he should see more power gains.

 

I'll repeat this since you don't understand it.
There are absolutely NO POWER GAINS to be had with higher flowrate injectors if the OEM injectors are working properly. "Performance" injectors are nothing special-they simply have the ability to flow more fuel-that is all. Unless there are serious modifications to the engine,and I mean serious modifications-the OEM injectors will flow more than enough fuel to support almost any N/A modification.
JL

 

If I didn't get it the first time, repeating it won't help as it truly did not. Repeating it a third time won't help either and I'll explain why I have a hard time believe that. Need to give better evidence then just repeating your conclusion(otherwise it's just circular logic).


Define serious modifications. When I did the injectors by themselves that was 90 hp over what tuning alone gained me(that was dyno tested, not seat of the pants) and that was with everything else engine wise stock other then tuning, which I believe you would not consider serious engine modifications(correct me if I'm wrong on that). Now that isn't true, but that was true about 5 months ago before I went crazy with modding.

Let's try this. Let's say I was just to change out a turbo, all be itself no other modification. Turbos aren't all that special just flow more air(sound along the same lines as another mod?). Let's say, I went with the stock 03 turbo(which is bigger then the stock 06 turbo that came on my truck), with no supporting tuning that would gain me 20 hp over stock with the same tuning. All I did was increase airflow, absolutely no additional modification and still netted 20 hp over stock(this is backed up by the tech at my dealership and with Matt at Spartan(we had the conversation on turbos stock and aftermarket for a long time while I was considering doing an aftermarket one for my truck) so it's not just me pulling numbers out of the air(no pun intended)).

 

What part do you not understand?
I'll give you a huge sum of money if you can simply swap injectors and gain 90hp on a 5.4L gasoline engine. Myself and about a million other guys because you've found a way to defy physics.
A 90hp gain on a diesel with simply an injector change and no programming changes to account for it-I'm not buying that either.
JL

 

I had tuning on it to compensate for it. Read my post carefully.

Why do you think I also added that part to it unless I had tuning as well?

I also didn't say he would gain 90hp over stock with injectors alone. That 90 hp was what I had gained with my injectors and I was using that to illustrate why I have a hard time believing your point. Of course, a gas isn't going to get that much like a diesel(just look at what they get with tuning alone(pathetic gains compared to diesel), but the question is can it get more with performance injectors compared to stock.

 

Your original wording before your edit stated:
What does that sound like?
I'll add this. Take a stone stock truck with perfectly working OEM injectors and replace them with aftermarket injectors with a higher flowrate. Recalibrate/Retune the PCM with ONLY the injector data and see if you gain any power. YOU WILL NOT.
Things that you do with a diesel engine with a turbo apply in no manner to a N/A engine.
JL

 

Wow, what a crappy pissing contest.

This is a gas engine, diesel engine misunderstanding.

Because a diesel engine has a power adder stock by way of the turbo, and the way a diesel engine works by nature, injectors have the potential to make a much larger difference than on any N/A gas motor.

Even on a diesel motor, you get to a point with the stock injectors that you can't make any more power by retuning the programming. You've peaked out the fuel delivery capability of them. This is the same for a gas motor. As you make modifications, either physically/mechanically or through programming that maxes out the fuel delivery capability of the injectors then you need to go to bigger injectors.

Injectors on their own certainly do not increase power on their own without supporting modifications that take advantage of their increased capacity. On my 97PSD, the 150/146 injectors operated just like stock on the factory computer programming.

It is unlikely that just through programming you will max out the factory flow rate of an injector on an N/A 5.4 without serious modifications. Usually a power adder is what necessitates the changing of the injectors and in many cases the fuel pump on an N/A gas motor.

 

I didn't edit that part of the post. It is still there. 2nd paragraph 2nd sentence. You also misunderstood it as well. When I said "by itself" I was making sure that you knew that I didn't have the various engine upgrades that you see in my siggy at the same time as I did my injectors so that way you couldn't say that my results were skewed by those other add-ons. Also with regard to the "tuning alone" part of the quote, that was to show that I saw greater increase in hp compared to what I was getting by tuning alone(in other words tuning + injectors > tuning alone).

 

my injectors are going out and i want to get injectors that are 24LB

 

That's a no-brainer. Diesel with turbo+additional tuning+aftermarket injectors=more power. Alot more power. You clarified that better in the additional information you added during the edit.
Aside from all of that...fact of the matter at hand is this:
You will gain absolutely NO power with a set of "performance" injectors on a N/A 5.4L with properly functioning OEM injectors.
That is the point I was making in my original reply to the OP.
JL

 

To do that will require a PCM recalibration with the proper injector slopes, breakpoints,etc in the tune. Just get a set of OEM replacements-there's no power or advantage to using aftermarket "performance' injectors unless there is a need for them.
JL

 

Ford has some pretty decent Injectors in the performance catalog. A lot of high perf chevy guys use them, 11-9 second LT1 Impala SS's. I believe they offer 24, 28, 32, 42 lbs/hr. I read somewhere that fords typically have a lower fuel pressure so the stock 24lbs/hr injectors are only pushing 19lbs/hr.

I kind of agree with some of these post, but I'll add, when changing the injectors, you might also want to change the fuel rails, plumbing, regulator and possibly pump. My thinking is if you need or plan to need extra fuel, make sure the rest of the system can handle the demand.

If you have a datalogging suite that can measure duty cycle of the injectors, that will point out if you need to adjust anything. 100% duty cycles mean the injectors are open the whole time, some injectors don't like this. I once heard the number you want is 85-95% duty, so you have some head space. Pressure and heavier injectors can accomplish this to some degree.