MAF Scaling - Open/Closed Loop Fueling info - Page 47 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Compelica · 02-16-2021, 09:22 AM

Quote:

Originally Posted by steve99

Hmm thats interesting.

The ecu can work out misfire by measuring the acceleration of the crankshaft after each cylinder fires, no acceleration it assumes misfire.

Im wondering how it would work out the learning for individual cylinder port and direct injectors since it only has one 02 sensor measuring comosite of all cylinders on a stock header but on many aftermarket its in one cylinder runner.

I realize I'm wasn't clear on my initial post, I have updated it.

The boxes from left to right are referring to the RPM ranges. In Techstream they are labelled Idle, Low, Medium and High. As I was doing only city driving at that time the low and medium values updated themselves after a few minutes which seems to correspond the trim learning at those ranges.

Kodename47 · 02-16-2021, 09:26 AM

Quote:

Originally Posted by steve99

Im wondering how it would work out the learning for individual cylinder port and direct injectors

The obvious one would be by injector ratio split

steve99 · 02-16-2021, 05:03 PM

Quote:

Originally Posted by Kodename47

The obvious one would be by injector ratio split

How would ecu know individual cylinder correction's with only one AFR sensor , could understand if it had one per cylinder

If its overall fuel correction can see how it would work.

Kodename47 · 02-16-2021, 07:24 PM

Quote:

Originally Posted by steve99

How would ecu know individual cylinder correction's with only one AFR sensor , could understand if it had one per cylinder

It's the LTFT RPM ranges, not cylinder.

steve99 · 02-17-2021, 06:55 PM

Quote:

Originally Posted by Kodename47

It's the LTFT RPM ranges, not cylinder.

ok that makes more sense then

Collin Long · 09-06-2021, 11:08 PM

Quote:

Originally Posted by Dom_J

There's really not a MAF rescale out here for the injen short ram intake anywhere or a directory on the front page of this guide? This VGI tool is being difficult. I can't even copy/paste the results into RomRaider from the logs.

EDIT:

MAF scales for INJEN and TRD image attached but it'd probably be quicker to use the VGI tool than to hand jam these numbers. Can't attach excel files

.

Will the INJEN MAF scale work on a K&N typhoon CAI?

EDIT: just put the stock airbox back in I'm not trying to mess with the MAF scaling or any of that plus intakes do little to nothing...

15WhiteFRS · 02-14-2022, 04:06 PM

Can I just manually enter in the maf scaling values from perrin in romraider since I cannot get the tool to work?

tomm.brz · 02-14-2022, 04:59 PM

yes

15WhiteFRS · 02-14-2022, 05:11 PM

Quote:

Originally Posted by tomm.brz

yes

So I just change both the volts and the grams?

Edit. I see the volts are the same.

ojuniour · 07-10-2024, 05:25 AM

sorry for reviving old topics but I have a dlimma here if anyonw wants to chime in..
I'm having rough idle and sometimes as soon as I quickly push on the aceleration (like tap).. the car just stalls right after.
as you can see my fuel trim is off the rail:

https://datazap.me/u/ojuniour/idle-r...zoom=1037-1334

Anyone want to take at that log and hint on what might cause it?

FYI: i've changed sparks and coils..and also replaced MAP.
i'm running harrop supercharger (AT)

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02-14-2022, 04:06 PM	#651
15WhiteFRS Member Join Date: Oct 2021 Drives: 15 FRS Location: US Posts: 48 Thanks: 2 Thanked 3 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Can I just manually enter in the maf scaling values from perrin in romraider since I cannot get the tool to work?

02-14-2022, 04:59 PM	#652
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,277 Thanks: 515 Thanked 1,121 Times in 811 Posts Mentioned: 70 Post(s) Tagged: 0 Thread(s)	yes

07-10-2024, 05:25 AM	#654
ojuniour Senior Member Join Date: Nov 2018 Drives: Subaru BRZ 2017 Location: New Jersey Posts: 205 Thanks: 3 Thanked 43 Times in 29 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	sorry for reviving old topics but I have a dlimma here if anyonw wants to chime in.. I'm having rough idle and sometimes as soon as I quickly push on the aceleration (like tap).. the car just stalls right after. as you can see my fuel trim is off the rail: https://datazap.me/u/ojuniour/idle-r...zoom=1037-1334 Anyone want to take at that log and hint on what might cause it? FYI: i've changed sparks and coils..and also replaced MAP. i'm running harrop supercharger (AT)

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