> On the turbo cars, even stock, the K&N is a very good way to
> spend your first tweek dollars...... It does make a difference.
Not meaning to blast a hole in the seeming love of K&N filters here, but,
as the old saying goes, you don't get nothin' for free. I seem to recall
some traffic earlier on this list regarding some tests comparing K&N vs.
stock filters in effectiveness in keeping crap out of your engine. Seems
to me that the K&N was not as good a *FILTER* as stock in dusty
environments, with some engine damage resulting in extreme cases.
Now I'm not the original owner of my '83 UrQ, but when I got it, it had a
K&N installed. As I was doing the engine rebuild, when I pulled the old
turbo for an inspection, I noticed that the compressor wheel was chipped
enough to give me the incentive to go through the major hassle and expense
of going with the RS2 turbo. It doesn't take a big piece of dirt to chip
a compressor wheel spinning at 100,000 rpm (or, for that matter, it
doesn't take a big chip in the compressor wheel to throw the whole thing
out of balance).
I also noticed something odd about all of the intercooler pipes.
Normally, these will have a light coating of oil on their insides due to
the PCV being piped back into the intake system. All of my pipes had a
nice gritty feel on their insides due to lots of fine dirt which had
gotten trapped in the internal oil coating.
Now of course I can't say all (or any) of this was due to the K&N (for
all I know, the previous owner could have run the thing without a filter
for a while), but knowing how festidious he was, I doubt he ever ran it
without the filter. I do know that I am now running a stock filter, and
keeping the K&N for the occasional track event.
P.S. Yes, I checked my K&N for rips, tears, and holes. I didn't find
any, and yes, it was properly oiled. Makes ya think, doesn't it?