MAF spreadsheet

[steveo]

Picture attached is a TBI AFR Averages MAP vs. RPM

Perhaps eehack's onboard maf analyzer has a similar view for MAF vs. RPM?

dave w

EE's MAF doesn't have any calibration against rpm, it's HZ/AFGS calibration so that's what it analyzes, it does it right beside a VE analysis but that is useless for tuning maf on this ECM so ignore it when doing maf calibrations. here's how she looks

Untitled.jpg

[steveo]

to be clear this analysis just straight up works with one click, no need to go screwing with the default settings at all. just ignore the VE readings if the maf is enabled, and ignore the maf readings if you're in speed density. that's the only determination its filters do not make for you, so it just analyzes both. i do have lots of users failing because they try to tune speed density while their maf is on.

[Stroked 388]

yes it does

basically you can set it to percentage mode and scale that area of the maf table by that percentage

Perfect Thanks Steve i will give it a try

[Stroked 388]

to be clear this analysis just straight up works with one click, no need to go screwing with the default settings at all. just ignore the VE readings if the maf is enabled, and ignore the maf readings if you're in speed density. that's the only determination its filters do not make for you, so it just analyzes both. i do have lots of users failing because they try to tune speed density while their maf is on.

Understood brother thanks a bunch

[Stroked 388]

yes it does

basically you can set it to percentage mode and scale that area of the maf table by that percentage

so on the maf spreadsheet 11-15 ect. correlates with 1100 to 1500 Hz in the maf tables just want to clarify if i'm correct.

[steveo]

oh not really, i guess my explanation wasn't really clear. hz isn't in the datastream. you're tuning AFGS (airflow grams per second) by its existing value only. so you get an afgs (airflow grams per second) value and an associated trim.

in your example 11-15 afgs needs to be reduced by 9% so you'd find the values in the table closest to 11-15 afgs and decrease them by 9%.

here's how you'd do that

maf_tuning.jpg

[Stroked 388]

No you're perfectly clear I just mistakenly put HZ instead. I wasn't quite awake when I responded back lol. Thanks again

[WASyL]

as MAF tuning is new to me (im SD guy) i have question how to use log.

Lets say AFGS 46-50 and 51-55 log shows +7%, does that mean i need to multiply theres g/s valuses in tune file by 1.07 ? and so on ?

best regards

[NomakeWan]

Yes, that's exactly it. Generally you'll find that the MAF delineations in the GM BIN files won't nicely line up with the ones in your spreadsheet, so you can either just 'guess' by entering the adjustment into the closest number, or adjust the spreadsheet so that its delineations match the XDF/BIN you're modifying, or just use the recommendations to build a new curve and then find the intersects on that curve which match the XDF/BIN delineations.

steveo also has a new program he's been working on called tablehack which might handle this task a little bit more gracefully. I haven't personally tested it yet since it's written with Qt6 and thus doesn't work on Windows 7 (and unfortunately the publicly-available patched Qt6 DLLs appear to be missing _Z11qUncompressPKhx which tablehack uses), but if you're running a newer OS, it might be worth giving tablehack a look.

Good luck!