[s-cars] MAF screens and boost threshold

[Paul Krasusky]

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Hap suggested:

From: CaptMagu at aol.com
Date: Sat, 19 Apr 2003 11:46:24 EDT
Subject: Re: [s-cars] MAF screen removal-please explain
To: strangconst at rogers.com, mlped at qwest.net, S-CAR-List at audifans.com

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Mark

I'd like to make a minor correction here. The author of the Negative Boost
articles was not trying to get more boost. His main objective was to get it
quicker. He was attempting to lower his boost threshold. In fact, he built a
DIY boost controller that did credible battle against waste gate creep but
retained the stock boost levels. By removing any of the negative boost
nasties and cleaning up the intake tract he was delivering the air to the
compressor section with less effort. This may in fact translate to higher
potential boost but more impotantly it will lower boost threshold.

I really can't understand why we're having all this discussion about a very
easy DIY mod. The proof should be in the results. Remove your MAF and remove
the screens. You might want to establish some sort of baseline test before
and then test again after. I like to use a 6th gear pull up an incline. I
establish at what rpm I develop full boost. I start the pull at 2500rpm and
go to full throttle. I simply note at what rpm I develop full boost. Right
now, I'm at 3200rpm. If things are better great leave the screens off. If
not
put them back in. HTH

Hap, wonderin in Everboost, Maguire







Removed MAF to filter screen, some but not much notable difference.  Inlet
screen came out on Friday.  Hmmm...  car is notably snappier, and confirmed
by a fellow lister.  Off line, through gears, top gear highway pulls, it's
there.

Not huge difference, but notable and worth it IMO (assuming I'm not creating
any unknown mixture gremlins etc. that Motronic is not compensating for?).
I'd agree, I probably gained a 100 rpm reduction in threshold, now coming on
full 22 psi @ 2,900-3,000.  Also, more able to consistently see a solid 22,
whereas before I'd sometimes see fluctuation, only pegging 21.5.

My 'guess' (danger!) would be these affects would be amplified by larger
turbo, RS2, etc., as that creates more intake.  But, for my 1+ and K24, I'll
take whatever benefit it's provided me.  I'm rather happy.

-Paul giddy in CT K.