I have a after market MAF from SLP and I have a M6. I know why some guys with A4s don`t descreen or get a after market MAF, (pros and cons) but is the only reason for a after markrt MAF for a larger opening going in to the TB and intake?

 

more air in + more air out= <img border="0" alt="[Burnout]" title="" src="graemlins/burnout.gif" />

 

When a mod. is done sometimes after tuning you find out you are a little rich. More air in sometimes leans out the mixture. Porting the stock one lets in unmetered air and it helps. Not me, but it has to others.

 

What I was wondering was is the only reason to get a after market MAF is to increase the diameter in the MAF or dose the after market MAF just perform beter, as far as the electrical components go. I don`t think I posted my queston detailed enough, but I think this will clear it up. Thanks for helpin me out. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

<small>[ December 07, 2002, 04:56 AM: Message edited by: al ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by al:
<strong>What I was wondering was is the only reason to get a after market MAF is to increase the diameter in the MAF or dose the after market MAF just perform beter, as far as the electrical components go. I don`t think I posted my queston detailed enough, but I think this will clear it up. Thanks for helpin me out. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">

 

I think there are theoretically two reasons - increased flow and some claim that their "electronics" improve performance. I added the granatelli MAF and the results were excellent, seems to pull stronger through the RPM range and my engine definitely runs smoother.

 

Increasing MAF diameter and/or
"smoothness" reduces -one piece
of- the intake tract airflow
resistance. It's not considerered
to be the most significant piece.
But is one that's a "freebie", so
it's popular.

Removing the screen helps the
"smoothness" (the micro-turbulence
created by the honeycomb and its
internal drag). It may (or not)
affect the distribution of airflow
at high flows (the screen's restriction
distributes airflow more evenly across
its face and thus through the MAF).
This seems to be a non-problem to most
people. Leaving the screen in retains
one last "safety net" for mystery chunks.

Increasing the diameter in place
(like porting the stock MAF)
without adjusting the calibration
affects the airflow measurement
scaling (accuracy) as the air that
cools the sense resistors is now a
different fraction of total airflow.
This tends to make a lean mixture
and an under-reporting of airflow
(used as an engine load indicator
by the automatic transmission
control code). Lean mixture may
help or hurt, repending on other
engine factors (bolt-ons, year /
PCM settings). Part-throttle leaner
may feel "snappier", but same lean-out
at WOT may knock. If the car started
out rich, this might magically make it
right on. That's where a lot of the
performance gain may be found, more
than the incremental airflow improvement.
You just have to try it to see.

Sometimes you wish you didn't see what
you saw (like when the ported MAF messes
with your automatic). Might leave the MAF
porting part until after you have the
ability to compensate for its effects.
Get a junk MAF and cobble on that, mix-
and-match the ends with your existing
MAF meter core and learn what your
car likes.

 

My WS6 didn't like the SLP 85MM MAS at all. Didn't feel as strong on acceleration and actually felt kinda sluggish thru the whole band. Took it off, added TR MAF ends to stock MAS. Gained 10rwhp and car feels much better on acceleration. Like was said more air better for the engine to make more power. Each car is different. It's another way to try to make more power, and hopefully make our prides and joy run better and faster. Just my .02 worth.

 

Jimmy Blue, that was a great explanation! I just wanted to add that with less load detected by descreening and porting stock maf, you can get more ignition timing without programming. In my case perf. was better with this work done on my otherwise stock 01 Z28. Performance with heavily modded car also likes extra timing and leanness of worked maf.I have tested under both conditions. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />