42# injector @ 43.5 ps1, 52# @ 58 psi, can I lean it out?
05-25-2010, 06:18 AM
#1
42# injector @ 43.5 ps1, 52# @ 58 psi, can I lean it out? Want to use the 42/52# injectors on approx 523 BHP by increasing injector flow variable on the injector table (have tuning software). Increasing the injector flow variable should reduce injector flow & lean it out. Figure that this will put me @ 64% injector duty cycle @ WOT. For reference: MAF reads 485 g/s max @ 102 MAP during WOT. Can I use these injectors or should I get some 42#ers @ 58 psi? Thanks in advance
05-25-2010, 08:49 AM
#2
TECH Resident
iTrader: (9)
Join Date: Oct 2005
Location: TEXAS
Posts: 989
Likes: 0
Received 0 Likes
on
0 Posts
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.
05-25-2010, 10:02 AM
#3
Thanks for the reply. The question is that I received 42# injectors rated @ 43.5 psi. Was thinking that since the calculator says that @ 58 psi, these same injectors will act like a 52# injector, should the 52# injector flow rate table be used?
Am installing injectors today. Sounds like, from your post, that the 52# injector flow rate tables are the correct flow rate numbers for these injectors. Will load the 52# rates & see what happens. Was concerned that perhaps these injectors were too large. Thank-you
Am installing injectors today. Sounds like, from your post, that the 52# injector flow rate tables are the correct flow rate numbers for these injectors. Will load the 52# rates & see what happens. Was concerned that perhaps these injectors were too large. Thank-you
05-25-2010, 02:51 PM
#4
She idles from 13.2-13.7:1 A/F, way rich. Should be 16.5 because that's where I have it tuned. Previous 36# injectors were 4.4531 to 4.8672 from 0-80 MAP & the 52# injector flow rates were entered as 6.2891 to 6.6328 from 0-80 MAP. Am assuming that the 52# injector flow rates need to be increased in order to lean the A/F ratio out more. What else can be changed, dwell time, others?
Trending Topics
05-25-2010, 08:40 PM
#8
They are Delphi 42lbs @ 43.5 psi. Just got back from a few WOT pulls & fueling is much, much more stable than it was on the 36 lbers (obviously). Kept telling myself that I could live w/ the 36 lbers even though logs showed sparatic fueling during WOT. Anyway, am happy to have upgraded. Need just a little more adjusting of A/F ratio @ WOT.
As to the 42 lb injector settings; they are now working properly.
As to the 42 lb injector settings; they are now working properly.
