If I understand right these injector codes are calibration codes from the manufacturer. Some injectors flow less some more and they all have different codes? If I want more power I put in codes from least flowing injectors, right? What about the balance of the engine, isn't it running very badly with "wrong" codes in it? Or is it like I heard somewhere that they are only for smooth idling?
If that's right, maybe we could ask from the injector manufacturer or remanufacturer what is the code for low flow injector in different engines and use that on every cylinder, who cares about the idle quality!
Started to think about this when I was reading about you guys in North America and Down Under changing injector codes of Cats and Detroits, never heard it done in Europe. I know they must put new codes when they change new injectors to Volvo engine but never thought what those codes actually mean.
Anybody know codes for Volvo Delphi and Cummins Celect injectors?

You are correct, The injector codes conpensate for lower and higher flowing injectors for balanced fuel flow. I have installed different codes on a C15 on the dyno watching fuel flow and power. 5232 adds 2 gph of fuel under full load at 1600 and about 40 hp to the wheels, 6999 added another .5 and 10 hp. This all depends on the set of injectors number combination installed in the truck. Customers have not complained about idle quality, but I have noticed it is not as smooth. I have not seen of any crankshaft failures related to the injector codes, but It must effect on crankshaft stress, Maybe more than the damper can handle?

DDS if I remember right in a seperate thread you mentioned about being able to flash a C-15 ecm is that correct. If so I am interested in having this done.

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'06 379 Pete with a MXS C-15 550 with heavy haul program, 200gph FASS, high flow mufflers, fuel and boost harnesses, shimmed fuel pump, and a 18 speed tranny. Leased to Schneider on their Choice program.

Hello DDS,
Your statement about crankshaft stress has me a little concerned, as I had my codes changed to 5232. Prior to that, they were "all over the board", and I was told the reason for that was to bring the engine into compliance as far as the nox emissions.
I really can't say if my engine is idling any rougher, I wasn't looking for that, I did notice however that it does seem to smoke just a bit changing gears.

I am talking about something I have no knowledge of , so bear with me....
Would the proper way to change the injector codes have been to add the same value to each injector, instead of changing them to an across the board 5232?
i.e. #1 inj. has a stock code of 3855, changing it to a 5232 would add a value of 1377, then you would add 1377 to the other injectors to retain the balance????

Like DDS said the injector coded in a Cat are to compensate for differing fuel flow between injectors. I have seen a lot of injectors set to 4242 (adds power but I dont know how much as I dont have access to a dyno), I have seen many truck with these codes do well over 1000000kms without any crankshaft problems but many do idle rough after the codes are put in, also in the odd instance the power will not change much at all. I agree it would be best to change all the injectors the same amount to keep the engine smooth but I dont think they are in order and some numbers won't be acepted by the ECM.
Some Cat industrial engines come from the factory with 1100 for all the injector codes.

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Speed costs money, how fast do you want to go?

So it's not only for idle quality, that's what I thought. Cheap HP but might get expensive in high mileage engines, not a good idea if you ask me.
What makes so big differences in injector flow? Nozzle hole size, tolerance between plunger and barrel, needle lift or what?

I seem to remember reading that changing the codes alters the spray pattern and duration, but don't hold me to that!

I don't see how changing the code would change the spray pattern. The pattern would be controlled by how many nozzles and where they are. The code controls the duration as far as I understand it...but I've been wrong before.

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'06 379 Pete with a MXS C-15 550 with heavy haul program, 200gph FASS, high flow mufflers, fuel and boost harnesses, shimmed fuel pump, and a 18 speed tranny. Leased to Schneider on their Choice program.

I am unsure about my previous post, which is why I asked you'll not to hold me to it!
Hopefully I didn't steer anybody wrong.

My 3406e had all of them set to 1500 when I got it. A Cat wrench turner told me that was a default number but I'm not sure I trust him since he didn't even know how to run the overhead.