[Biturbos4] First of my own wrenching of my '01 S4

Ti Kan ti at amb.org
Tue Mar 9 22:10:28 EST 2004

The filter oil can damage either types of MAF sensor.  This is unrelated
to the fact that the earlier S4's MAF sensors seem to also fail on its
own.  Over-oiling the filter will definitely be a problem, but even as it
is, it doesn't take a lot of imagination to think that some of that oil
would wind up being sucked into the intake tract anyway.

I also recall reading that the K&N does not filter as well as the
stock filters, causing dirt to enter the intake system.  Not a
good thing.

If I were you, I'd keep the $42 for a very nice dinner rather than
waste it on something that might buy me nothing except possible trouble
down the line.

2003 A4 1.8T multitronic
2001 S4 biturbo 6-sp
1984 5000S turbo
1980 4000 2.0 5-sp
 R 1 3 5  Ti Kan
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Single Malt writes:
> Yes, I have heard that the K&N's claims are perhaps not so accurate and that
> dyno tests have not supported any significant results .. but for $42 bucks and
> a chance to get my hands dirty, I thought it was a somewhat safe venture.
> I've also heard that the MAF problems related to the K&N were specific to a
> certain MAF ... the non-Hitachi MAF (was it Bosch?).  Is this not the case? 
> The K&N comes "ready to install" ... are the coating issues perhaps related to
> those who have cleaned and re-oiled (recharged) the filter?
> -steve
> --- Ti Kan <ti at amb.org> wrote:
> > Single Malt writes:
> > > Now that my car is out of the original warranty, I felt like tinkering a
> > bit. 
> > > I've been told that replacing the air filter with a K&N variety would yield
> > > some more power and could hardly effect the Audi Assured coverage I am now
> > > ...
> > 
> > Be careful with that K&N.  The filter oil has been known to coat
> > the MAF sensor and damage it.  Also, I have not seen *any* objective
> > proof that the K&N filter adds horsepower.  Their ads make some
> > pretty wild claims, but I don't think that's backed up by real dyno
> > numbers.

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