Never ran Link with a MAF... what to do with maf comp

[GSLENK]

So i watched ECM link demos about 5x each and I got my idle dialed to what I believe is perfect. 680 pte's -29%, I found my deadtime to be about 210 uSecs, to bring idle fuel trims down to 0-3% area (it oscilates around 1-2, but occaisionally dips close to 0 and 3)

I got both the MAF gm/rev and SD gm/rev to about .25 (+/-.01, usually offsetting each other but w/e I think its close enough)

I had to tweak the maf comp table and the SD VE table respectively to allow for these proper airflow adjustments.

Are the airflow adjustments independent of each other?

Did I even have to adjust Maf raw since Im running SD?

Will I ever have to touch the MAF adjustments? above idle? Should I set the rest of them to 0? (my old tune had them a bit above)

Im just a little confused and I think im doing the same job twice, and for no point possibly since I no longer run maf... but I kind of just did it that way anyway because all the noob vids on ECM tuning were geared towards a MAF type of tuning.

 

[snowborder714]

Are you running with a MAF or on SD?

 

[twdorris]

I had to tweak the maf comp table and the SD VE table respectively to allow for these proper airflow adjustments.

When running SD, the MAFComp table would normally never be used. It's normally disabled by default with that "Disable MAF compensation w/SD operation" checkbox on the MAFComp dialog.

If that checkbox is checked, you can ignore the MAFComp table entirely.

Did I even have to adjust Maf raw since Im running SD?

Not normally, no.

Will I ever have to touch the MAF adjustments? above idle? Should I set the rest of them to 0? (my old tune had them a bit above)

Just check that "disable" checkbox and then you can leave the MAFComp tab alone. No need to zero it out or change it at all then. Just focus on the SD VE table instead (which appears to be dialed in pretty well given your gm/rev at idle).

Thomas Dorris
ECMTuning, Inc.

 

[Calan]

When running SD, the MAFComp table would normally never be used. It's normally disabled by default with that "Disable MAF compensation w/SD operation" checkbox on the MAFComp dialog.

Tom, you say that like there may be some reason to use it "non-normally"...so now I'm curious.

 

[GSLENK]

When running SD, the MAFComp table would normally never be used. It's normally disabled by default with that "Disable MAF compensation w/SD operation" checkbox on the MAFComp dialog.

If that checkbox is checked, you can ignore the MAFComp table entirely.

Wow. I didn't really see that check box before. Thanks for the heads up. Its checked from now on. I believe I'm still ok as far as my idle goes then as long as my SD table values are spot on during idle. I figures .25 g/rev is .25 g/rev no matter what computation derives it. So I played it safe and made both of them .25 even though I guess the SD conversion/cable translated my SD values to raw MAF anyway.

Are you running with a MAF or on SD?

SD.

I'm sorry usually I post my relevant mods so people don't have to waste time looking for them.

logs too long by 5%

Tom, you say that like there may be some reason to use it "non-normally"...so now I'm curious.

I thought there was an option to use both MAF and SD to help adjust SD VE tables in link? I might have seen something like that in the tutorials or I may have been hallucinating.