[s-cars] Re: MAF foul up

[Fred Munro]

Right you are, Tom. I've seen two listers post of problems with K&N - one
found the inside of his intake hoses coated with dust and the other found
the leading edges of the cold side turbo blades eroded from "foreign
particles". Both switched back to paper filters.

I have attached a post comparing K&N to stock BMW paper filter performance
for the edification of the S-car fraternity.

Fred Munro
'94 S4

ATTACHMENT:

Here's a post that came up on the 924/944 list a while ago on the same
topic, that I have posted to this list before.  Solved it for me.
Paper filters are awfully cheap.  I can replace them for a heck of a lot
of times for the cost of a K&N anyhow.  Let's see $50 for a K&N, or
under $10 for a paper filter.   Assuming a 20k change interval, that's
100k miles worth of driving before I've even reached the cost of the
K&N, and that is before I buy the oil, so the cost savings isn't even a
point for me.

Here's the post:
It was done on a WMB, but should be similar of course.

Enjoy!

Greg Roa
Cincinnati, OH
86' 4kcsq
93' 90 CS
83' 944

>Are "Performance" Air Filters a Good Idea?

The following information was taken from a posting by Jim Conforti (AKA
the
Land Shark).  Jim is a well known tuner in BMW circles.  His web site is
the
Bonneville Motor Werks.  The testing was done on a BMW air filter but
the
concepts should apply to all manufacturers.

Comparing Stock to Performance Air Filters

First, a "prologue".  This was a scientific test, not one done by filter
manufacturer X to show that their filters are better than manufacturer
Y.
The test results are pretty irrefutable as the test lab tests and
designs
filters where "screw ups" are absolutely NOT allowable (I can't say any
more for security.  Think "Glow in the Dark").

OK, with that in mind, onward.

A scientific test was done on TEST filters where air was loaded with
ACCTD
(some standardized "test dust" called AC Coarse Test Dust) and sucked
through the TEST filter then through an analysis membrane.