MAF Calibration Tutorial

[ms3blackmica]

UPDATE:

I added the the 5th video to the original post. All 6 videos are now up and running.
@Haltech, you can go ahead and throw all 6 videos into the zip file.

I'm glad this thread is helping a lot you.

[Haltech]

Other 3 videos added in archive.

[Standsideways]

You are the man ms316w

[ms3blackmica]

Originally Posted by Haltech Other 3 videos added in archive.

Thank you for doing that @Haltech. That was a definitely good a call as members can now have the videos saved and bring their laptops out with them to the car.

Originally Posted by Standsideways You are the man ms316w

no problem glad i could help

[ms3blackmica]

update in the OP on AP mounting (due to many questions asked)

[eksces]

hi! thanks for this tutorial.
I still have some questions
Why do you make changes in the maf table based on the volts? In albior tooning guide it is said to make changes by the breakpoints f.ex. 0-5,7g/s - one multiplier. 5,7-18 second and so on. You change the multiplier in between (exactly where you see the change in your log). Which method is correct?

[ms3blackmica]

because the g/s could be anywhere on the table. technically the g/s are whatever you set them to and they can be wrong. thats why its best to go by the maf volts and go by what the cars telling you

[eksces]

it is very hard to find out what is the volts boarder below 5,7g/s because it is already 3,3 at idle and with small touch of gas pedal it shoots over 5,7.

[ms3blackmica]

Originally Posted by eksces it is very hard to find out what is the volts boarder below 5,7g/s because it is already 3,3 at idle and with small touch of gas pedal it shoots over 5,7.

you can just edit from 0 volts to the first voltage that the ECU switches its breakpoint at

[ms3blackmica]

more noob threads coming later today

[dantes5823]

Originally Posted by ms3blackmica more noob threads coming later today

What's on the next episode?

[ms3blackmica]

How to repare broken BPV bolts (because they WILL break)

How to set up a good economy map (very short, only few minutes video)

[dantes5823]

@voltron knows all about the broken bolt. As do I.

[Voltron]

Yo fuck that bolt.
@dantes5823

[dantes5823]

Originally Posted by voltron Yo fuck that bolt. @dantes5823

Lol I know man. It happened to me helping this dude. I went to put my shit back together and the bolt snapped. Totally fucked my night up.

[ms3blackmica]

Originally Posted by dantes5823 What's on the next episode?

How To: Ugrade Your BPV Bolts

[eksces]

Originally Posted by ms3blackmica How to set up a good economy map (very short, only few minutes video)

+1, have 2 thousand mile trip in 3 weeks. it's $7-8 per gallon here so help would be appreciated

[sidekick]

So I end up hitting OL(-.16 LTFT) pretty early in my MAF Cal logs, does that mean I should log AFR as well and basically do a WOT MAF Cal, but for part throttle?

[ms3blackmica]

Originally Posted by boost_addict So I end up hitting OL(-.16 LTFT) pretty early in my MAF Cal logs, does that mean I should log AFR as well and basically do a WOT MAF Cal, but for part throttle?

You are either giving it too much throttle or didnt drive enough. What g/s are you hitting -. 16 ltft?

[sidekick]

Originally Posted by ms3blackmica You are either giving it too much throttle or didnt drive enough. What g/s are you hitting -. 16 ltft?

I'll have to check when I get home. This isn't a problem for anyone else though? Most people transition to OL pretty early.

[ms3blackmica]

Originally Posted by boost_addict I'll have to check when I get home. This isn't a problem for anyone else though? Most people transition to OL pretty early.

Not that i know of. I can usually get up to about 100 g/s sometimes 80 before losing the trims. Also if your seeing -. 16 in the lower g/s thats a sign that the ecu hasnt learned anything in that breakpoint yet

[dot584]

When I tuned using Albilors tunning guide he talks about changing the Cl/ol transition point to make it transition earlier. If your having trouble staying ol would it be a good idea to raise the transition point so that during the maf calc it stays ol?

One time I pressed the accelerator so slowly I never even hit 100g/s at redline, but it was still enough to switch to cl due to me adjusting the transition point.

Sent from my ADR6300 using Tapatalk 2

[sidekick]

Originally Posted by dot584 When I tuned using Albilors tunning guide he talks about changing the Cl/ol transition point to make it transition earlier. If your having trouble staying ol would it be a good idea to raise the transition point so that during the maf calc it stays ol? One time I pressed the accelerator so slowly I never even hit 100g/s at redline, but it was still enough to switch to cl due to me adjusting the transition point. Sent from my ADR6300 using Tapatalk 2

I may just do this so that I can get a solid MAF cal.

[ms3blackmica]

Originally Posted by dot584 When I tuned using Albilors tunning guide he talks about changing the Cl/ol transition point to make it transition earlier. If your having trouble staying ol would it be a good idea to raise the transition point so that during the maf calc it stays ol? One time I pressed the accelerator so slowly I never even hit 100g/s at redline, but it was still enough to switch to cl due to me adjusting the transition point. Sent from my ADR6300 using Tapatalk 2

I believe you are referring to the Closed Loop Max Load -A,B,C,D,E tables, correct?

What do you currently have them set to? Raising them to something like 1.50 Load might help you to not enter open loop so early. Make sure you revert back to whatever values you currently had after you've gotten your MAF Cal done for closed loop fueling.

Originally Posted by boost_addict I may just do this so that I can get a solid MAF cal.

Try out what i said just above

[eksces]

but isn't it possible that there is -.16 because the Ecu just doesn't have to make correction? the measure is just right at this breakpoint?

[ms3blackmica]

Originally Posted by eksces but isn't it possible that there is -.16 because the Ecu just doesn't have to make correction? the measure is just right at this breakpoint?

not really.

temperature changes, fuel quality, elevation, etc... can all change simultaneously so your ECU will always be doing some work to correct fueling.

Do me a favor and post up your MAF Cal log where you keep seeing your LTFT go to 0 so i can see whats going on

[eksces]

18-30g/s: in 4 different logs on 4 different days:
datalogMAF.xls

[ms3blackmica]

Originally Posted by eksces 18-30g/s: in 4 different logs on 4 different days: Attachment 71355

How many miles did you put on the car before taking these logs ?

It would appear that you did not drive in the 18-30 g/s breakpoint long enough for any trims to be learned

[eksces]

its after 50 city miles (~10 key cycles)
last log is after probavly 80-100 miles

[ms3blackmica]

Originally Posted by eksces its after 50 city miles (~10 key cycles) last log is after probavly 80-100 miles

then consider that one bad ass MAF Cal !!!

Do me a favor though....grab another MAF Cal log but this time also Log STFT (Short Term Fuel Trim) as well and lets see how the ECU is working instantaneously in that breakpoint.

Log:

MAF Volts
LTFT
STFT
MAF g/s

[eksces]

ok. will do that today/tomorrow. I'm finishing new 50 mile cycle coz i made corrections based on that logs above.

[ms3blackmica]

Originally Posted by eksces ok. will do that today/tomorrow. I'm finishing new 50 mile cycle coz i made corrections based on that logs above.

awesome. that should tell us whats really going on as far as corrections to fueling.

It could be that your MAF values in that breakpoint are so accurate that it barely needs to make any correction to fueling, and its such a small percent that its not registering any average for a LTFT because it does not correct for long enough. We shall see when you post the log.

[dot584]

Originally Posted by ms3blackmica I believe you are referring to the Closed Loop Max Load -A,B,C,D,E tables, correct? What do you currently have them set to? Raising them to something like 1.50 Load might help you to not enter open loop so early. Make sure you revert back to whatever values you currently had after you've gotten your MAF Cal done for closed loop fueling.

Im not sure what I have it at now but its low because I set it to what Albilor recommended in his guide, so its whatever that is. Thats exactly what I was going to do, raise it really high just for the maf calc then lower it again on the next revision. I just posted to make sure thats the right thing to do, so thanks for answering my question.

[Werm]

Pulled the data from my maf cal but I couldn't reach the 100 g/s threshold by redline. Is it normal or necessary or could it be due to the 100 degree temps outside which lowers the air density?

[ms3blackmica]

Originally Posted by Werm Pulled the data from my maf cal but I couldn't reach the 100 g/s threshold by redline. Is it normal or necessary or could it be due to the 100 degree temps outside which lowers the air density?

As you start approaching 4500 rpm you have to start giving it a tiny bit more throttle otherwise you wont hit 100 g/s.

EDIT:

For example, if at 4500 RPM your at 15% position on your accelerator pedal, then you need to gradually increase to 20% by slowly going from 15 to 16~17~18~19 to 20. That should be just enough to get you over 100 g/s.

[eksces]

ok. i've found the base logs for my maf cal so I added the stft data to the xls file I posted before:
datalogMAF.xls
what does it say?

[ms3blackmica]

Originally Posted by eksces ok. i've found the base logs for my maf cal so I added the stft data to the xls file I posted before: Attachment 71648 what does it say?

I'm not sure what happened in log #2 but your STFT is showing a up to 20% fuel being added. Was that log done with the AC on perhaps ?

Anyway, Log #1 and #3 show that the ECU is not really making much correction to hit your proper fuel target. My guess is that its not enough to register a solid average for a LTFT. Keep driving on this map for more and more miles and let me know if you ever develop a LTFT for the 18 g/s - 30 g/s breakpoint. It is possible that your MAF values for that breakpoint are just damn near spot on.

[eksces]

Yeah i turn on AC on my maf cal for like 50% of time. I am not on this map anymore - I made corrections to stage 1 ots map and now it looks like this:
MafStage1.xls

[ms3blackmica]

Originally Posted by eksces Yeah i turn on AC on my maf cal for like 50% of time. I am not on this map anymore - I made corrections to stage 1 ots map and now it looks like this: Attachment 71752

how many miles on this reflash ?

[eksces]

this log was made with around 40 miles. Now I have over 200 miles on it but didn't log it yet.