ECMlink 2,0L Airflow per Rev

[SNAKE_15]

Hello there. I know that it was stated to shoot for a .25 airflow per rev but since I have 272 kelfords, is it ok to be higher? Reason I ask is because if I leave my airflow per rev at .25 and set my fuel trims properly, I run mostly lean at idle.

 

[jakelandry]

You wouldn't run Lean at idle if your fuel trims were in line and airflow per rev was at .25. You can move your airflow per rev anywhere you want it and still have perfect fuel trims and whatever afr you want. It should be higher however.

 

[SNAKE_15]

You wouldn't run Lean at idle if your fuel trims were in line and airflow per rev was at .25. You can move your airflow per rev anywhere you want it and still have perfect fuel trims and whatever afr you want. It should be higher however.

i mean, it dosent stay lean all the time but it always bounces from lean to a perfect ratio. log posted below, thanks in advance.

 

[jakeachy]

Are the cams stock? Your idle varies quite a bit, more so than I would expect from your isc being on at 30/31. 7 bolt, or 1g cas?

 

[SNAKE_15]

Are the cams stock? Your idle varies quite a bit, more so than I would expect from your isc being on at 30/31. 7 bolt, or 1g cas?

No sir. I have kelfords 272 and it's a 7 bolt.

 

[EGLTAWLN]

in your ECUconfig menu in the MISC tab you have a box checked that should not be.
uncheck the Disable airflow smoothing with SD operation box.
maf based cars need airflow smoothing.
your average airflowperrev for that log was .24 .
i think your log looks pretty close but your airflowperrev is a bit low.
bump up the 50hz slider in mafcompadj a couple %.
maybe take away some deadtime.
its close.

 

[SNAKE_15]

in your ECUconfig menu in the MISC tab you have a box checked that should not be.
uncheck the Disable airflow smoothing with SD operation box.
maf based cars need airflow smoothing.
your average airflowperrev for that log was .24 .
i think your log looks pretty close but your airflowperrev is a bit low.
bump up the 50hz slider in mafcompadj a couple %.
maybe take away some deadtime.
its close.

Thanks. I'm not sure why that box was checked. I never messed with that. Is it normal for my air fuel ratios to jump around like that with the cams?

 

[SNAKE_15]

Unchecked that box. As for my air fuel ratios, is it normal for those to jump around constantly with kelfords 272?

 

[EGLTAWLN]

i don't have aftermarket cams so i don't know.
your airfuelestimate and wideband should peak and dip on the datalog graph but the ecu does that to find the "center" of where it should be.

 

[Calan]

in your ECUconfig menu in the MISC tab you have a box checked that should not be.
uncheck the Disable airflow smoothing with SD operation box.
maf based cars need airflow smoothing.

He's not running SD, so this box is irrelevant.

 

[EGLTAWLN]

He's not running SD, so this box is irrelevant.

and that's why i told him to uncheck it. it should only be checked if you are running speed density. MAF based cars need airflow smoothing.
this check box IS relevent. if you leave it checked and you are not running speed density, it will mess with your tune.

 

[gofer]

a it should only be checked if you are running speed density. MAF based cars need airflow smoothing. this check box IS relevent. if you leave it checked and you are not running speed density, it will mess with your tune.

That's incorrect. Having the box checked/unchecked doesn't apply so long as your MAF is set to stock or some type of MAS.

It literally means that if that box is checked it will ONLY disable airflow smoothing with SD operation.

 

[EGLTAWLN]

i found it affected my gm maf based tune.
do you have any links that prove that this check box only activates with SD activation?
the ecmlink wiki doesn't mention this.
just trying to be accurate.

 

[BoostedBeaver]

Assuming you have access to the ECMlink forums, you can view dmertz (Dave) post here.

http://www.ecmtuning.com/forums/showthread.php?t=72123&highlight=base maf selected

This post can also be found in the uploaded image below.

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[EGLTAWLN]

thank you robert.
humble pie. mmmmmm.