LS1-450

iTrader: (33)

42# inj @ 43.5 psi which is approx 50# @ 58 psi. My current 36# ers are @ 107% duty cycle. I want to lean the flow rate table out in order to reduce the 50# effect of the 42# ers. Anyone done this successfully? Figure so long as they're not below 62% @ WOT, should be good & that leaning out the flow rate table can get 'em there. Please comment.

LS1-450

iTrader: (33)

Bump...

BLK02WS6

iTrader: (2)

I put 42's in at around 47 for the fuel pressure difference... But, it really doesn't matter cause you need to retune the VE and MAF tables anyway...

LS1-450

iTrader: (33)

I run OL MAF & MAF is current for new set-up. I will need to change the OL fueling table though. Found that my injector duty is way high @ 107%. So, bought the 50#ers. 50#ers were bought as 42#ers, but the seller did not disclose that they were 42# @ 43.5 psi. Glad to hear that 42's @ 47 worked. Was hoping that there was a way. Figure that as long as the injectors are not below 62% @ WOT, they are OK.
Thanks

BLK02WS6

iTrader: (2)

You are going to need to go over the fueling with a wideband! You can't just change the IFR table and assume its good throughout... not sure if that is what you meant by "I will need to change the OL fueling table".

LS1-450

iTrader: (33)

Yes, I have a wide band & haven't assumed anything.

BLK02WS6

iTrader: (2)

Okay, good... just wanted to be sure.

mcamarols1

iTrader: (9)

I don't understand exactly what you are trying to to ask, but I will try and answer. Are you running 42lbs injectors rated @ 43.5psi with the flow rate tables calibrated for 43.5psi? If you are you need to adjust the tables to the fuel pressure you have. (more than likely 58-60psi)This should lean out the engine and you might need to tune again. But if you are asking if your duty cycle will decrease by adjusting your flow rate tables, then the answer is yes. But the injectors will not flow any more than they are designed to. If you have the wrong injector flow rate tables in your calibration the PCM is going to command a pulse width for the injectors you program in the PCM. If you have the 42lbs injectors with the flow rate tables set for the 43.5psi scaling then you are probably running rich right now. Adjust accordingly and you should see a change in your trims.

LS1-450

iTrader: (33)

Thank-you for all of the replies. As always, I appreciate the help. Will post some results after the install & some tune time later today.

LS1-450

iTrader: (33)

Got her worked out. Just have to check WOT & we'll be there. Thanks again

BLK02WS6

iTrader: (2)

No problem, glad you got it straight!

Old Geezer

iTrader: (3)

"Figure that as long as the injectors are not below 62% @ WOT, they are OK"....Huh??

LS1-450

iTrader: (33)

OK meaning "not too large to work with." Regardless, learned alot today & the injector settings are now good. Need a little more WOT A/F ratio adjusting & she'll be there. BTW, they ended up @ 78% duty cycle, WOT.

CLRD4TO

iTrader: (4)

I know an older thread but Im searching an issue anyways. Where did you come up with the 62% at WOT? Ive got 42# svo that are running very lean at high manifold vacuum. Duty cycle is 44% @ WOT.