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1994-1995 5.0 Mustang SN95 Tech Forum

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Unread 02-07-2010   #1 (permalink)
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Default 24 lb injectors to install on stock GT Mustang motor

Hi another question...

I have a set of 24 blue top injectors.

I want to install them on my pretty much stock 5.0 GT40 heads, trick flow stage one cam 1.7 rockers, good headers, off raod H 96 cobra fuel pump.

ANycomments, with it drive like a nightmare? Tuning?

I understand that any lb injector reacts to the o2 sensor response, computer response...Dumps more fuel if required buy the computer...


5 speed car, 3.27 gears ( soon to be 3.55, maybe 3.73)

Let me know... Just getting into the mods of 5.0's
I have ran stock fox and sn 5.0's so I know the systems and what not..

Thanks..

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Unread 02-07-2010   #2 (permalink)
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It won't be a nightmare but you'll have less gas mileage and possible fouled plugs, not to mention you might be blowing black smoke when you get on it from it having too much fuel.

Why would you want to switch the injectors? There's no need at this point and they won't make any more power.
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Unread 02-07-2010   #3 (permalink)
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Without making any tuning changes it will use more fuel. I'm not sure that it will be so bad that it will blow black smoke or anything but you do not need them at this point. I would wait until you get a tune and install them before you get the tune.
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Unread 02-07-2010   #4 (permalink)
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Default 24 lb injectors

Yea, that is what I thought , more gas etc... I was also going to run the 96 cobra mass air sensor (and body)..

I did think that the injector would respond to what the engine needed as aposed to just dumping fuel... Not true? Or do they dump 24 all the time?

.. I figured I had them so why not put them in while it was apart...


I am running GT40 heads, stage 1 cam, headers, offroad h, little more gear....
I guess I could try? see what come out of the tails....
What would I wait for to put the 24's in? A blower?

Thanks

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Unread 02-07-2010   #5 (permalink)
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Allow me to interject......

Injectors support power they don't make it.......
 
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Unread 02-07-2010   #6 (permalink)
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Default 24 vs 19

Quote:
Originally Posted by RLG34750 View Post
Allow me to interject......

Injectors support power they don't make it.......
That make sense to me to a point, are we following the same track of thought, like for example putting a 850 double pumper Holley on a stock 289? Dumping fuel, black smoke, bogging down.

The Holley 850 carb is totally dependent on how much fuel is dumpped by acc pump, jets and power valve ( along with throttle bore postion) The motor is not supporting the specs ( high compression, headers, high lift cam ect...) to use the air/fuel ratio that a 850 cfm offers, so a rich condition will exist on a stock motor, dump fuel and blow black smoke...
.. If the motor was built to support the amount of fuel and air offered by the 850cfm it would run as intended.

OR in contrast, being EFI computer driven.

Not really up on FI stuff, so help me out....

Ok so if a efi car is computer controled, say by a stock untouched computer ( calibrated for 19 's) running stock 19 injectors, running a calibrated stock 19 MAF, the computer will tell those injectors to let a certian amount of fuel in, at a certian time in at what ever lb is needed at that point in time. If the computer requests 19lbs, the 19lb injectors have the capability of delivering that fuel.... Am I thinking right>?

So if the same stock engine as noted above has a set of 24's installed, (same 19 computer, same 19 maf) will the 24's act like the 19's and deliver the proper amount of fuel requested buy the computer?
Or is the 24 injector calibrated different.... Say at 30mph a 19 will flow a calibrated amount of fuel, does the 24 injector designed to flow more fuel at that same speed, or does the 24 only flow what is needed by the computer.
Realizing that the 24's have the capability to flow 24 lbs, but when the stock 19lb computer and stock 19lb maf send that same 19lb info to the 24's do the 24's flow the same amount of fuel as the 19's?
Follow me? The 24's can flow 24, but if a computer is telling a 24 to only flow 19, will the 24 respond, and flow 19 supporting only the 19lbs required? (understanding that a 24 can flow more)
Now if the same motor above is connected to a computer, and MAF programed to 24lb, and the motor has 24 The injectors should take the info from the computer and flow 24 if asked to by the computer. In turn flowing more fuel into the motor. AM I on the right track?
Is that how the process works??
See at this point I am still learning about injectors and efi options.
If my question is confusing, now you know where I am at !

Basically If I put 24s on a stock 19 motor, it should only flow 19 as requested by the computer.... it should act like a 19 .....

Or again, am I off on different planet?

Again.... Just trying to work it out...Hate to be such a dumb ass..

Let me know what you think or know..

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Last edited by LAZERREDCOBRA; 02-07-2010 at 07:45 PM. Reason: spelling
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Unread 02-07-2010   #7 (permalink)
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Very good question. They way I understand it, the computer will still treat a 24# setup as if it was a 19# setup, therefore with every injection putting too much fuel in.
I hope someone with a broader knowledge can shed some light on this.
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Unread 02-09-2010   #8 (permalink)
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Quote:
Originally Posted by YLDPONY View Post
Very good question. They way I understand it, the computer will still treat a 24# setup as if it was a 19# setup, therefore with every injection putting too much fuel in.
I hope someone with a broader knowledge can shed some light on this.
If you buy an MAF that is calibrated for 24# injectors and use 24# injectors, you would still end up using the same amount of fuel as the 19#ers. So there would be no power gains.
if you ran 24# injectors with stock tune and stock MAF, then you would be using WAY too much fuel. The way I understand it, it basically works off a percentage (called a "duty cycle") of fuel to so much air.

That's the best way I can explain it really. LoL makes sense to me.
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Unread 02-09-2010   #9 (permalink)
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Yes, if you have a calibrated MAF. He was saying if you use the stock MAF.
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Unread 02-11-2010   #10 (permalink)
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So what everyone is saying is I shouldnt have 24lb injectors either even though I have a 76mm mass air calibrated for it? I have a Holley Systemax Upper and lower intake 70mm throttle body F303 cam 24lb injectors BBK Long tubes and some other mods. I was told it wasnt a big deal just dont go bigger then 24 unless I am pushing a super amount of horsepower.
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Quote:
Originally Posted by primerpony12s View Post
So what everyone is saying is I shouldnt have 24lb injectors either even though I have a 76mm mass air calibrated for it? I have a Holley Systemax Upper and lower intake 70mm throttle body F303 cam 24lb injectors BBK Long tubes and some other mods. I was told it wasnt a big deal just dont go bigger then 24 unless I am pushing a super amount of horsepower.
In your case the 24# injectors are unnecessary. Since you have the MAF to match it though, it's not going to use up any more fuel than the 19# were. You going to the 24# injectors isn't going to gain you any horsepower, and with your mods you're probably still under 225HP at the wheels. The 19# injectors are good up to 300+ at the crank.
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Unread 02-12-2010   #12 (permalink)
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The 24 pound injectors and mass air might work together just fine, it's just going to be too much for the engine like putting a carb that's too big on it. Until you get past approximately 320 engine hp, there's no need to go to 24s.
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Unread 02-12-2010   #13 (permalink)
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Exactly your engine in its present state does not need 24lb injectors......

even with everything calibrated it will run fine....

with the addition fuel in could contribute to ring & cylinder wall damage......

first and foremost there will be no performance increase......
 
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Unread 02-12-2010   #14 (permalink)
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I understand there is no performance increase I always understood that part of it. I wasnt to sure though if it would hurt anything though. I guess I got my answer maybe I will switch back to the 19lb injectors until I get better heads. Thanks guys!
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Unread 02-12-2010   #15 (permalink)
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Quote:
Originally Posted by RLG34750 View Post
Exactly your engine in its present state does not need 24lb injectors......

even with everything calibrated it will run fine....

with the addition fuel in could contribute to ring & cylinder wall damage......

first and foremost there will be no performance increase......
What size injectors do the stock 94 / 95 Cobra Mustang 5.0 's run?
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