zapp168

iTrader: (7)

I had my 60# injectors resized to 73# I went back to the excel file I found here to re-calculate the Injector flow rates, well it went badly....I am just going to re-do the VE from beginning, but wanted to know the best numbers to plug into the IFR table.
I have been using the Excel file for a while, but it was pointed out to me that if I started with the stock values for lets say 28# injectors, then calculate the percentage difference in this case 28# to 73# I got a 160.71% increase and just plugged the percentage increase (in my case EFIlive) That would maybe be more accurate?
Between the excel spreadsheet and the percentage increase I got very different numbers, I am not sure which to run with??? The percentage calculator seems like a more accurate idea to me, I have just always used the spreadsheet.
THANKS!!!

ZL1Killa

iTrader: (17)

by spreadsheet are you referring to the spreadsheet in my sticky?

The percent difference may not work as the fuel pressure rating that the injectors are rated at may differ, therefore throwing your numbers off.

use the excel sheet...and what do you mean resized to 73#? like you sent them off and got them re-done and they now flow 73#/hr @ X psi?

zapp168

iTrader: (7)

Yes your chart! I have been using it all along. I sent my 60#ers to FIC and had them resized to 73# plugged the numbers into the spreadsheet as usual and changed them in EFIlive as usual. Well the car went wayyy lean. I spoke with FIC and he suggested the percentage increase, but he is not familair with EFIlive nor the spreadsheet, plus he keeps talking two bar, three bar, four bar...If anyone knows, is a 28# injector in an LS1 really a 24# @ 43.5? That flows 28 at the 58# rail preasure?

69LT1Bird

iTrader: (1)

What 60's did you start with?

What Bar did FIC say the flowbench test was done at for the 73 Lb injectors. If they are 73 @ 4 bar you will be ok, 73 @ 3 bar will make the huge at 4 bar.


14.5 (atmosphere) x 3 bar = 43.5
14.5 (atmosphere) x 4 bar = 58

zapp168

iTrader: (7)

I started with mototron (Siemens deka) 60's. The sheet that came back with the injectors shows "FLOW TESTS DONE AT 43.5 PSI Flow rate cc780 LB" So I would assume these are 73 lb at 3 bar correct? But they were originally 60 lb at 3 bar, when I plugged the new numbers into the spreadsheet (for 73@58PSI) the car was lean. I am compairing 60#@ 43.5 to 73#@ 43.5, I plugged the 60# numbers from the spreadsheet and ran the car over a year (28 to 60). I plugged in the new 73# numbers and ran very lean, putting the original 60 # numbers back in makes for perfect idle and cruise AFR with 10:1 at higher RPMS and WOT. I am simply going to use the new numbers and redo the VE table at this point.

69LT1Bird

iTrader: (1)

780cc is actually 74.29 lb.

Here is what I came up with based on your specs.

JonatRLMS

let me see what i can come up with

FICINJECTORS

iTrader: (30)

i'm confused too. the 60 are 73 in the ls1 and the 73 are 82approx.. So you tuned the VE on the 60's as 60's when they should have been tuned as 73. Am I right? The 28 is a 24lb injector at 43.5. They only become 28's via the pressure increase

zapp168

iTrader: (7)

This is more fun than watching a one legged man in a butt kicking contest!!!!!
I never knew that my 28's were 24's in disguise, there is never much mention of that on here, I just assumed that all injectors for LS1 are rated at 43.5 (3 bar) and that is a given so I would have thought my 28's just flowed higher because of the 58 PSI (4 bar) preasure. The spreadsheet from ZL1Killa takes into consideration flow rate at 43.5 and your current fuel preasure and the rating of injectors. I maybe an idiot, the only thing I know for certain is that I know nothing for certain. EFIlive lists IFR at grams/second vs.GM.MANVAC. (b4001) and I have not thought enough to figure out what size injector my car thinks it has at 35 Kpa manifold vacuum....LOL. So using the spreadsheet I should be able to plug in 82# @ 43.5 PSI and should get the same result as 73# @ 58 PSI. Or am I just retarded? I am going to play with this some more. Thanks Jon for taking an interest, car is down again for other mods Getting a new tensioner for the Procharger, so I can put those injectors to work

FICINJECTORS

iTrader: (30)

back up for a minute: the 83# is at 58 not 43.5 if you use those numbers in the spread sheet you will have the wrong inputs. call me tomorrow at the shop to go over this..