SVO 42lbs Green Top injector data

[Maxlean]

Hi guys. I’m trying to more accurately tune my 383 LT1 after 10 years of it running pretty well. I was previously running the stock injector offset vs voltage which certainly isn’t correct for the injectors I’m currently running, which are the SVO green top 42lbs m-9593-f302. I’ve found what appears to be an official data sheet, https://performanceparts.ford.com/parts/ics/m-9593-f302.pdf
This data is way different from the data on the Greg Banish dvd. For example, the offset at 14v on the ford data sheet is .670ms. The Greg Banish dvd shows .090ms at 14v. This is a massive difference. Using the ford data in my pcm has things quite rich at low pulse widths, while the Banish data results in very lean under the same conditions. What gives? Any insights? Btw, I’m running these injectors at the correct 39psi with an injector flow rate of 42. Also, haven’t changed the low pulse modifier table from stock, except when I used the Banish data, because he’s got that data, but it was much smaller than stock.
Thanks in advance.
Scott

[In-Tech]

Hiya,
Personally I would not waste another second until you have those injectors flow tested. I have two injector machines and trust nothing aftermarket anymore. Before the aftermarket started copying and failing, I could not believe I needed these machines :(

These came in the most perfect AcDelco boxes.

[Maxlean]

While I agree that may be ideal, being able to use published correct data should be an excellent starting point.

[tayto]

there was an excellent write up done by 84elky on this forum not to long ago about injector offsets. you will see more power gains and a smoother running engine with a set of flow matched injectors.

[TriumphR3]

Here is the thread by 84elky regarding offsets
http://www.gearhead-efi.com/Fuel-Injection/showthread.php?10362-Installing-Bosch-III-Injectors-Without-Voltage-Offsets

[Maxlean]

Thanks for the link. I was having a difficult time finding it.

[steveo]

i used to really advocate for having proper offsets or the tune will suck, but lately i care less

the offsets are mostly important for low rpm operation fine tuning to keep the AFRs stable, partially because you have wider variation in voltages there because the alternator isn't revved up and accessory load or whatever has a larger effect. when there's lots of fuel and lots of air it makes way less difference. if you always had a consistent voltage, closed loop trims would probably take good care of it regardless of your injector offset value.

on engines with ginormous cams i've found things are just a s**t show at low rpm anyway so the offsets don't have much effect

actually this week on one of my cars, i sent some injectors out for rebuild/flow benching (one cylinder was really lean), and put some reeeeal cheap chinese ones in the meantime with totally unknown offsets

at idle the trims vary widely, but the second you get a bit of throttle in it? no problemo.

[YungTyph]

Hiya,
Personally I would not waste another second until you have those injectors flow tested. I have two injector machines and trust nothing aftermarket anymore. Before the aftermarket started copying and failing, I could not believe I needed these machines :(

These came in the most perfect AcDelco boxes.

I have been unknowingly fighting injectors for a little bit now (turns out I dont suck as much at tuning as I thought), do you recommend flow testing after pulling and cleaning injectors? They are known OEM LS2 32 lb, but my passenger bank was running pretty lean on throttle. I don't like the look of the cheap AC Delco or Bosch injectors as my gut says these are likely whitebox china injectors.

The current plan (unless everyone yells NO) Is to further clean them, re-install, verify rail pressure, and then see if I observe any lean condition on either bank. If so, swap the O2, then the injector banks to see if the issue follows anything.