I am having a chip reprogrammed but I need to know what to make the settings for my injectors. I am putting the tune port setup on my stock LO3 305. I have ls1 injectors that flow 28.5 lb/hr @ 58.5 psi. I also have an adj. regulator so I can turn them down pretty far. my big question is what flow rate do I put in the computer? the programmer said he was going to put them in as 19 lb/hr so it thinks it is controlling a smaller injector. is this correct? input please.

 

What max fuel flow /// whay max horsepower, are
you planning for?

 

basically just need it good enough to make engine drive well, not to rich, not to lean.

 

If you want that FI to flow at 19 lb / hr,
you'll have to turn the fuel pressure down,
I calculate to 26 psi.

 

I wouldn't turn the pressure down that far, you may get poor atomization, and you might get some funky reactions from the ECM when it tries to change the PW and gets a lot more change than it was expecting. Calculate the flow rate at 40-ish psi and set the injector constant for that.


IMHO a good tuner wouldn't suggest using 28lb injectors and telling the ECM they're 19. It's just a shortcut to get more fuel, when the right way is right there in front of him (just takes a little more time.) Just my $.02.

 

I'm accually running the same injectors and they said it was suppose to be set at 25# in the chip for a 43.5 PSI, but when installed in the LPE 219, 383, SR I was getting 108 BLM across the board. I have since changed the constant to 28 and its all within spec except at idle. Also passed e check with flying colors and also gets 20+ MPG. Drivability is perfect also.