MAF Calibration 101

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Asthma
Posts: 6
Joined: March 4th, 2016, 7:36 am

Re: MAF Calibration 101

Post by Asthma »

Thanks for your quick answer. It's an normal Injen CAI, no modifications or something like that. Basically I had this issue over a long time, even if had driven the car for a long period of time the STFT is quite high and the ltft is low. Do I something fundamental wrong? As I said the actual and desired AFR is close to each other. Over ~3,25V the LTFT is not recorded as I know, should the STFT also at zero because I'm Openloop?
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Steve @ VersaTune
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Joined: March 29th, 2010, 12:58 pm

Re: MAF Calibration 101

Post by Steve @ VersaTune »

It's possible that there's an air leak or some kind of lump in your maf table. Post a log using the MAF Cal preset and your tune or a screen shot of your MAF table.
Asthma
Posts: 6
Joined: March 4th, 2016, 7:36 am

Re: MAF Calibration 101

Post by Asthma »

Hi,

attached you will find the MAF numbers, Screenshot and the requested datalog. For sure, the calibration can be better, but I'm still focused to the high STFT.

I will search for some Air leaks again, but I tought I did it properly last time.

THX
Attachments
MAF Screenshot
MAF Screenshot
Screenshot 2016-06-28 13.08.55.jpg (240.16 KiB) Viewed 29645 times
MAF.txt
MAF Numbers
(989 Bytes) Downloaded 806 times
Data log - 2016-06-28 12.34.58.csv
Datalog
(92.38 KiB) Downloaded 854 times
mituc
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Location: Iasi/Romania

Re: MAF Calibration 101

Post by mituc »

The STFTs are higher only in open loop in your case, which is perfectly normal.
2008 Cosmic Blue Mazda 3MPS
Built engine + WMI + GTX3071 gen2, ~509BHP @34PSI
2008 Icy Blue Mazda CX7
Stock engine and exhaust (YES!!), JBR3" + GTX2867 gen2 + Autotech HPFP, self-tuned to 330-ish BHP
Asthma
Posts: 6
Joined: March 4th, 2016, 7:36 am

Re: MAF Calibration 101

Post by Asthma »

Can't believe... I'd checked some random logs from other guys and never saw such high STFT. Are you quite sure?
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Steve @ VersaTune
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Re: MAF Calibration 101

Post by Steve @ VersaTune »

important detail that it only happens in open loop :)
mituc
VersaTuner guru
Posts: 1324
Joined: December 17th, 2011, 2:47 pm
Location: Iasi/Romania

Re: MAF Calibration 101

Post by mituc »

Asthma wrote:Can't believe... I'd checked some random logs from other guys and never saw such high STFT. Are you quite sure?
I am quite sure... about 1475.325% sure. Or, wait!, 1475.327%!
2008 Cosmic Blue Mazda 3MPS
Built engine + WMI + GTX3071 gen2, ~509BHP @34PSI
2008 Icy Blue Mazda CX7
Stock engine and exhaust (YES!!), JBR3" + GTX2867 gen2 + Autotech HPFP, self-tuned to 330-ish BHP
Asthma
Posts: 6
Joined: March 4th, 2016, 7:36 am

Re: MAF Calibration 101

Post by Asthma »

Don't get me wrong, the internet is full of different statements and in my case I only wan't to make sure that's all fine. I'm very happy about your help.

Thank you
vortk355
Posts: 3
Joined: August 1st, 2018, 5:55 pm

Re: MAF Calibration 101

Post by vortk355 »

"Log using the MAF Calibration preset in VersaTuner’s virtual dashboard"
I cannot find this on the dashboard, is there a button I am missing?
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Ugnius @ VersaTune
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Joined: March 19th, 2010, 11:57 am

Re: MAF Calibration 101

Post by Ugnius @ VersaTune »

What is your car?
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