201-A4

<ul><li><a href="https://forums.audiworld.com/a4/msgs/1910467.phtml">x-post to A4 forum</a></li></ul>

xr4tic

A chipped K03 flows ~160-170g/s with the stock housing, and the 3" MAF housing flows roughly 25% more air, so that translates to 130-140g/s

So, if you're not flowing more than 130-140g/s, then you have a problem, since that's what a chipped K03 flows.

I'd guess it should be hitting somewhere around 170-180g/s at least.

201-A4

Could you clarify why the increase of area would lead to less airflow and lower #'s?

ModifiedA4

part of which is the cross sectioal area of the maf housing. a larger housing with the same sensor will give lower readings.

the maf sensor reads based on the velocity of the air flowing over it.

velocity goes down when cross sectional area of the maf is increased. the maf sensor "thinks" its seeing lower flow, when in reality flow is increased.

ModifiedA4

<ul><li><a href="http://physics.bu.edu/py105/notes/Bernoulli.html">http://physics.bu.edu/py105/notes/Bernoulli.html</a</li></ul>

ryoung

I'm curious what the max reading is for an S8's ECU. I've hit 210 g/sec twice in "normal" driving this week.

201-A4

Now I see, the area increase would surely lead to decreased velocity.

ModifiedA4

the maf has micro-etched pads which heat up during operation. flowing air over the pads cool the sensor elements, this is how the sensor detects velocity.

201-A4

simmilar to a hot wire anamometer (sp?) ?

201-A4

I understand the relationship of area Vs. velocity. I just didnt realize the MAF was able to convert velocity #'s into #'s of g/s.