In an effort to stir up some more *ahem* discussion...
05-17-2006, 07:31 AM
#23
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Me like pictures. <Wishes I-Net offered "Pop-Up" pictures> TJ: I finally got around to
sending the car cover you won. It should be there tomorrow or Friday. Sorry it took so long Dave.
05-17-2006, 07:36 AM
#25
AudiWorld Expert
well, more specifically, the others had larger MAFs, so the cross section measured air flow is lower
When one increases airflow, you can certainly exceed the limits of the stock sensor/MAF. One can retain the same sensor if the MAF housing is enlarged. Doing this lowers the sensor reading to stay within the limits of the sensor.
Matt/Erik/Dave all have larger MAF housings and use the stock sensor.
Andrew has stock sensor and MAF, but his boost is lower, thus lower airflow.
I have RS4 MAF/sensor. The RS4 MAF is not as large as the others who have changed, thus my readings are higher for the same given airflow.
So long as the software accounts for the MAF size, all is well.
Bottom line is that the MAF values as reported can not be directly compared as they don't represent reality. Well, actually mine and Andrew's do, but the others are scaled.
Matt/Erik/Dave all have larger MAF housings and use the stock sensor.
Andrew has stock sensor and MAF, but his boost is lower, thus lower airflow.
I have RS4 MAF/sensor. The RS4 MAF is not as large as the others who have changed, thus my readings are higher for the same given airflow.
So long as the software accounts for the MAF size, all is well.
Bottom line is that the MAF values as reported can not be directly compared as they don't represent reality. Well, actually mine and Andrew's do, but the others are scaled.
05-17-2006, 07:38 AM
#28
AudiWorld Expert
oh, I know exactly what you are talking about. Good ole "Dynamic Systems" at RPI ;-)
I think that's what it was called. Or was it Intro Control Systems. Damn, now I forget.
Anyway, here's my example which is indeed showing this:
<img src="http://ctny.audiworld.com/mark/s4/misc_data/k03_chip_comparo/giac_boostspike_throttlecut.gif">
and
<img src="http://ctny.audiworld.com/mark/s4/misc_data/k03_chip_comparo/giac_boostspike_throttlecut_take2.gif">
Anyway, here's my example which is indeed showing this:
<img src="http://ctny.audiworld.com/mark/s4/misc_data/k03_chip_comparo/giac_boostspike_throttlecut.gif">
and
<img src="http://ctny.audiworld.com/mark/s4/misc_data/k03_chip_comparo/giac_boostspike_throttlecut_take2.gif">
