swapped injectors results not what I expected

[PJG1173]

Ok so after alot of driving around yesterday datalogging I had come to the conclusion that the 4.3L injectors were not cutting it. WOT PE couldn't get the AFR below 14.9 on the WBo2 at high rpm, VE table at 97% and DC in the 70's. Yes I know I could have put more pressure to them, but I figured I was getting up there in DC. So I slapped in a set of 61# injectors copied the injector latency table, flow from a 5.7 bin, and backed the FP down to 13psi. Now I'm globaly lean without changing my ve tables. is there something I'm missing here? going from 46# injectors @ 15psi (according to the calc they were running 49# at that pressure) to 61# at stock FP should have made it rich doing the math, or maybe I just don't understand. So now what do I do? lower the injector constraint or raise the FP back up?

[gregs78cam]

If you still have some room DC wise I would suggest lowering the Injector flow rate. If not raise the pressure. But I would probably double check the part numbers to make sure that they are 61#ers. What engine/combo is this?

[EagleMark]

If you had just lowered fuel pressure your data log would have gone all lean right? So now you lowered your fuel pressure and changed flow rate to correct of injectors and got same lean right?. You just gave the PCM flow rate to compesate for bigger injectors.

Lower fuel injector flow rate and it will get richer!

[PJG1173]

they are GM5235206 and from a little searching they are the 55# injectors so I copied the info from the wrong bin.

[gregs78cam]

yup that'll do it. So making the flowrate correct should help.

[PJG1173]

so far all the $0d 5.7l bin's Ive looked at have 61# in the constraints and the 5.0 has 55#. more searching has resulted in conflicting information so does anyone know what these truly flow? they have orange/black markings and GM5235206*RPD is etched in the top.