This is very similar numbers to the articles I found...so the case for this 100psi guy isn't looking good! I suspect that the OEM specs for your 94 7.3 IDI is probably pretty similar to my 86 6.9 IDI. Anyone have any information that would suggest the specs would be different?

 

Assuming that you are asking the question of me:

The link where I found the article is on one of my previous posts...

And yes, 1800 to 1950 is a tolerance of 150 but it also says that adding one shim adds 55PSI so I'm thinking it shouldn't be an issue to get them matched within 55PSI... meaning that within 100PSI isn't that great (but much better than the old GM guy was saying). And considering another member stated above an OEM spec of +/- 75PSI a person knowing what they are doing with the right equipment shouldn't have an issue getting them less than 75PSI of each other.

That being said though... in a real world application, if we match one set of injectors within 75PSI and another set within 100PSI... Is it really going to make a difference?

 

Star, I think you're addressing me eh? The info comes from the Ford service and diagnostic addendum for the factory turbo engine. As I read it they give the tech's the optimum of 1900 plus the low and high range then the baseline minimum for replacement. But like a lot of other components there can be room for improvement. Seems to me the closer they are the better. Talked with a service manager of a truck center today getting some input diagnosing my contamination issue and he was saying he was a tech in the days of the IDI's. Got around to fuel systems and he said that the BB coded injector's were better for my engine than the spec'd G coded one's. So maybe take what the book spec's out with a grain of salt.

 

Well + or - 75 would be 150 pounds or 8% of 1900
and + or - 50 would be 100 pounds or 6% of 1900 so if the new ones you get happen to be on the outer limits of the tolerences his would be 2% better.
This is assuming that delphis tolerences are + or - 75.

 

If you want to talk to him join OB and PM him or make a thread over there he will be glad to talk to you

 

Actually, unless I'm reading it wrong Type4 is offering a set matched to each other to be within 100 psi. Ford is specing it at 1900 psi optimum with a range of 75 psi one way or the other for a total of 150.

 

I was told that new Delphis range from 1750-1900 out of the box with the majority being 1800-1900. I have heard from numerous sources that remans from a place like pensacola are all over the map as far as pop off. I thought the G code injectors were a emissions injector for california only?
nate

 

I have heard from quite a few different that bb was at least as good if not better than g code something about the g codes were there because of epa reasons. (have no proof of this)
In my way of thinking on the old big cam cummins we had to use injsetors according to the cpl # of the engine which changed by pump calibration and valve timing. Then we matched the pop pressure with the correct injectors. AND if we changed the pump calibration we also went up a notch with the injectors.

So in my old (geezer) way of thinking it is more important for our injectors flow rate and pop pressure to be matched with our IP calibration and fuel setting then with each other for optimum performance. Or am I thinking all wrong.

And if each shim changes the pressure a consistant 55 pounds a machinist building custom shims could indeed get them matched to some very low numbers, this would be good if he knew what the numbers needed to be to match the individual pump.

 

When pensocola sells new not remans for 174 a set why would anyone buy remans. how cheap are they.

 

$108 shipped

 

I am trying to find out if my new injectors were tested and matched and if the pump was calibrated to them. Hmmm email last week nothing today. It seems if you buy a set they should be tested and matched but that is not what I've been reading. Probably more important, for me anyways, is the testing will show the spray pattern. Apparently this is another issue with new/remaned injectors with a poor spray pattern. If the pattern is such where it washes a section of the cylinder then there will be no oil lubrication at that spot resulting in the engine...
The G code injectors are called for with the turbo and E code for the NA. Ford says the G's flow characteristic of the nozzle is tailored for the turbo charged engine. I have heard about the emission thing but not sure where it comes from.

 

Sorry guys.... totally thinking of the tolerance thing wrong,oh well. Live and learn!

 

I think all factory turbo's were g code. And as far as I know there is no more cali only vehicles built, when cali changes the rules we all get to pay the piper, I think that was one of the reason bush pulled that privilage.

And for 8.25 a piece I would never buy a reman.

 

And I thought this was a PSD problem since we inject into a prechamber and we don't inject on to our pistons. But looking at a diagram of our prechamber I can see how a portion of the spray could reach the piston.
nate

 

The G codes suck! they have an awful spray pattern its not really o nice fat pretty cone its kinda a real skinny cone not quite a **** but not what you want from an injector in an idi, the tips are actually a little larger ny .005 if i remeber right but the pintle are shaped like this U as aposed to the BB codes which is shaped like this V the BB codes have a nice fat cone that idi seems to really like best, also G codes pop off at like 2150 were as BB pop at 1750-1900, i am actually getting him to experiment with mine, im getting my pop pressure set as close to 2300 as possible, if i dont like it then im going to go about 1600 next time, which is what A code injectors were set to, if thats not what i like then im going back to the stock BB pressure