Injector Duty Cycle

[brian617]

These IDC% numbers don't look right to me. Is there an adjustment I need to make to get correct IDC numbers in my data logs? Currently using an $0E .BIN but numbers were similar in $0D.

[RobertISaar]

are you looking for peaks? because you're running in history average mode.

running maxmium would should peak DC.

[EagleMark]

Also check that your ADX file has been corrected to show accurate IDC... it has been wrong for years on TBI engines, read here:

http://www.gearhead-efi.com/Fuel-Inj...ll=1#post20248

[brian617]

are you looking for peaks? because you're running in history average mode.

running maxmium would should peak DC.

Even running maximum wasn't close. Had to fix ADX per Mark's instructions.

[brian617]

Also check that your ADX file has been corrected to show accurate IDC... it has been wrong for years on TBI engines, read here:

http://www.gearhead-efi.com/Fuel-Inj...ll=1#post20248

That's the magic fix I was looking for, Thanks Mark!

[EagleMark]

The magic is in everyone involved in GearHead-EFI.com, I could never and would have never figured that one out! Dave W got me into spreadsheets. gregs78cam literally forced me to do math and held my hand every step of the way! Do you know how much my 53 year old brain hurt trying to remember how to do something I hated in high school?

The particular IDC mistake was found because all that came together when I was tuning a car and I knew dam well it was running out of fuel, yes by driving and feel, but then by plug readings! But the data showed OK? Had it been a MPFI and not a TBI the data would have been correct.

[brian617]

Now that I have that sorted out and plan to re-enable PE and do some AFR checks, what kind of lower numbers should I expect in IDC%? I know that anything over 85% gets too close to static, but is there a lower number to watch as well? Should I be watching Pulse Width too? My Off Idle VE table ranges from low 40s to Mid 90s.

[EagleMark]

Nope, just under the 85% is considered "All is well!"

There's nothing in your build to worry about the low end. Like huge cam and high fuel pressure and the minimum BPW being to high.

Like Robert said though, no history average there, you want to look at Most Recent sample or High.