Ceiling on MAF readings?

bryand · 13-04-2005, 13:42

Checking through my Vag-Com logs to see what effect my new exhaust was having, I found that the maximum MAF value for my (un-remapped) Fabia vRS was 1249.5 mg/stroke with the Cupra intake on.
With the standard intake, the maximum MAF was 1249.5 mg/stroke.
I smelt a rat and checked some more logs.
With the standard intake, filter and exhaust the maximum MAF reading was ... 1249.5 mg/stroke.
Am I missing something here, or:
Does 1249.5 simply mean "lots and lots of air, dunno how much but it's a lot"?
Is this a limit of the MAF - e.g. once the hot wire has been cooled, it can't get any cooler?
Is this a limit of Vag-Com 5.1?

Anybody else come across this?

skodakid · 13-04-2005, 14:26

Its either the maximum range for the ECU or the maximum output of your MAF sensor (Which incidentally drifts down with age causing "loss of power" symptom). Every digital/analog sensor/system has a maximum....

In any case, isn't it nice to know all that expense and pratting about has given you ....zero increase in [max] power (fueling)...

bryand · 13-04-2005, 14:58

Quote:

Originally Posted by skodakid

In any case, isn't it nice to know all that expense and pratting about has given you ....zero increase in [max] power (fueling)...

Ah but the fun is in how you get to max power - you virtually never use all the power you've got (not for sustained periods) anyway.

EddyH · 13-04-2005, 15:04

MAF reading is in grams per second so I think you are looking at the wrong data.

13-04-2005, 13:42	#1
bryand Fabian Join Date: Jun 2004 Posts: 1,767 Thanks: 1 Thanked 21 Times in 19 Posts	Ceiling on MAF readings? Checking through my Vag-Com logs to see what effect my new exhaust was having, I found that the maximum MAF value for my (un-remapped) Fabia vRS was 1249.5 mg/stroke with the Cupra intake on. With the standard intake, the maximum MAF was 1249.5 mg/stroke. I smelt a rat and checked some more logs. With the standard intake, filter and exhaust the maximum MAF reading was ... 1249.5 mg/stroke. Am I missing something here, or: Does 1249.5 simply mean "lots and lots of air, dunno how much but it's a lot"? Is this a limit of the MAF - e.g. once the hot wire has been cooled, it can't get any cooler? Is this a limit of Vag-Com 5.1? Anybody else come across this?

13-04-2005, 14:26	#2
skodakid Briskodian Join Date: May 2004 Location: the real world Posts: 193 Thanks: 0 Thanked 0 Times in 0 Posts	Its either the maximum range for the ECU or the maximum output of your MAF sensor (Which incidentally drifts down with age causing "loss of power" symptom). Every digital/analog sensor/system has a maximum.... In any case, isn't it nice to know all that expense and pratting about has given you ....zero increase in [max] power (fueling)... __________________ Count me out...

13-04-2005, 15:04	#4
EddyH Briskodian Join Date: Jun 2004 Location: West Yorkshire Posts: 4,892 Thanks: 37 Thanked 26 Times in 26 Posts	MAF reading is in grams per second so I think you are looking at the wrong data. __________________ EddyH Audi S8 Audi A3 2.0 TDI Sport

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