MAF Scaling - Open/Closed Loop Fueling info

[steve99]

Originally Posted by Dru670

Ah okay thanks. Is there anything else that must be done after scaling the MAF? Also, if I wanted to rescale the MAF again do I load the previous ots rom and log my drive and scale maf or do I use the current rom with the newly scaled MAF and log and adjust that one? Sorry just not sure because one instruction says to log tons and tons of data and repeat while another says just do 15 min normal and 10 highway 2-3 WOT and done.

You never usually get it correct the first time, usually takes three or so goes.


15min city 10 HI way and 3 wot runs is fine.


yes once you have updated maf scale use that for next runs, unless it produced really crap results.

[Ondreiko]

Originally Posted by Dru670

Ah okay thanks. Is there anything else that must be done after scaling the MAF? Also, if I wanted to rescale the MAF again do I load the previous ots rom and log my drive and scale maf or do I use the current rom with the newly scaled MAF and log and adjust that one? Sorry just not sure because one instruction says to log tons and tons of data and repeat while another says just do 15 min normal and 10 highway 2-3 WOT and done.

Hi!
My opinion (as i did MAF scaling several times) is that you need log file for approx 30 min drive (or OFT logs only for 20 minutes? but it is sufficient anyway) preferably including 3-4 WOT pulls and then you scale your MAF loading your logs and appropraite tables of the ROM you drove into VGI tool, which works perfectly if you set everything properly. Then after 60 miles driving you make another log and do scaling again. Every time for scaling you use ROM which you drove for particular log. And i suggest you stop when you feel that your last version drives worse or not better than the previous one, and you use that previous version of the ROM then for any further tuning needs such load limits tables, what i am trying to learn with guru guys here now. and then i suggest you can look at the other parts of VGI tool, where some other useful things can be scaled or tuned so you can try em on.

[Dru670]

Originally Posted by Ondreiko

Hi!
My opinion (as i did MAF scaling several times) is that you need log file for approx 30 min drive (or OFT logs only for 20 minutes? but it is sufficient anyway) preferably including 3-4 WOT pulls and then you scale your MAF loading your logs and appropraite tables of the ROM you drove into VGI tool, which works perfectly if you set everything properly. Then after 60 miles driving you make another log and do scaling again. Every time for scaling you use ROM which you drove for particular log. And i suggest you stop when you feel that your last version drives worse or not better than the previous one, and you use that previous version of the ROM then for any further tuning needs such load limits tables, what i am trying to learn with guru guys here now. and then i suggest you can look at the other parts of VGI tool, where some other useful things can be scaled or tuned so you can try em on.

Thanks will try that. BTW I live in Vegas and its starting to get warm...I read its best to log around 20-25c (68-77f) and we are soon to be hitting 80-90F am I still able to scale around those temps?

[freerunner]

Calibration is still possible. An advantage of a perfect calibration at 20°C ambient temp is the possibility to calibrate the temperature compensation tables later on.

[Dru670]

I read somewhere if I remember correctly that LTFT can only be positive if IAM is 1?... I notice I'm at .52 IAM and LTFT is at around 3.90% is this bad?

[freerunner]

FLKC can be positive if IAM is less than 1.

[Dru670]

Do I have to reset and have IAM at 1 before I start doing some data logging for mad scaling?

[JB86'd]

Originally Posted by Dru670

Do I have to reset and have IAM at 1 before I start doing some data logging for mad scaling?

No. Now if you were adjusting timing and trying to tune out knock, the answer is yes.

[Dru670]

Originally Posted by JB86'd

No. Now if you were adjusting timing and trying to tune out knock, the answer is yes.

Can I make multiple logs say for closed loop 30min regular driving do a 20min and 10min log and combine the two or do I have to do 1 continuous 30min log?

[Kodename47]

Originally Posted by Dru670

Can I make multiple logs say for closed loop 30min regular driving do a 20min and 10min log and combine the two or do I have to do 1 continuous 30min log?

Yes, you can use multiple log files. The tool does this for you as well.

[Ondreiko]

Originally Posted by Dru670

I read somewhere if I remember correctly that LTFT can only be positive if IAM is 1?... I notice I'm at .52 IAM and LTFT is at around 3.90% is this bad?

it is bad when you get IAM less 1 meaning your engine is knoking as you have either bad fuel or too lean mixture of wrong ignition timing as i assume.

[Ondreiko]

http://datazap.me/u/ondreiko/3004-wo...3-6-11&mark=13
Guys, here s my last log.
Picture is better with engine load limit 1.07 at 3800 rpm cell.
Please kindly comment if my intention to decrease (still cant load example picture but im trying anyway) some cells in MAF scaling table at 3.44V and some higher places is right in order to flatten the curves and dig out some more power probably.
And do i need to tweak engine load limits any further for the same purpose?
Thank you again,

[freerunner]

Hey, looks good
I would not bother fiddling around with load limits any more.
Decrease value at 3.44V and call it a day.

[Ondreiko]

Guys, am i finished sclaing MAF and load limits?
http://datazap.me/u/ondreiko/v10010-...6-10-11&mark=8
I am going to scale IAT comp table now, can i start now or should i roll back to tune where my FLKC is 0 throughout the whole log?