legacycentral bbs

On my 91 Turbo Sedan, I reciently had the air filter on my car
changed. Its the stock set-up. However I just noticed today that
the screws, bolts, whatever to keep it closed are gone. What are the
things missing? What size are they? And are they easily replaceable?

Then, on the snorkus removal, are you just removing that part, or do
you need stuff to put in after removing it? And is it hard to do?

Okay last one. What kind of after-market intake stuff is there for
these cars? Are there cold-air intakes or any other goodies like
that?

Chris

Chris there was a lengthy discussion on the snorkus installation a week or
so back if you can find the posts..

cheers
Paul
Auckland NZ

Remove and replace the snorkus. Put a K&N panel filter in place of your papper jobbie.

If the bolts holding the filter box shut are gone then it might be because the retainer nuts which are fitted into the plastic are gone or the plastic's broke. Just use regular nuts and bolts to hold the thing down. You don't have to put a cold air feed after removing the snorkel but it would certainly help and isn't hard to do. Intake stuff is plentiful but most people are happy with the standard airbox with snokus removed and a cold air feed.

Hi All,

replaced my standard element with a Foam one (from MRT cant remember
exactly which one). Had it is for servicing at subaru and they said
that they were a load of crap. Ignored them on this, but then had it
at another mechanic( dyno/efi specialist) due to some other probs and
then they tell me also that they are no good and that bits of the oil
can actually attach themselves to the AFM and throw it out of wack!

what is the general thoughts behind these after market filter
elements?

Cheers,

Jason

i say go the K&N

Yep K&N. it’s a cotton filter.

The general thoughts behind these are mixed and varied. Oiled foam (and cotton gauze) filters might pass oil onto the MAF or AFM (as you call it) but then again so can the oil vapour being returned by the rocker breathers. An ITG foam filter has a stainless steel grid on its backside to help prevent its oil going through but the grid spacing is quite wide so can't say how effective this is although I do have ITGs in both of my cars. The grid also helps to prevent the filter from distorting from suction forces. The K&N panel or even cone is reported to give the least MAF related problems. A lot of people use stainless steel cones (which run dry) but a lot of others say that the filtration properties of these are not fine enough which allow particle contamination of the MAF. How then are loads of people using these without any problems? A more reasonable explanation is that the MAF is more prone to failure through vibration which results from incorrect mounting of cones (ie. unsupported by brackets or supported in the wrong places). Vibration damage are the most common failure method of the Subaru MAF while heavily oiled panels do give problems as well. I guess after all that is: K&N panel filter is a good bet and not as expensive or risky as using a cone based induction kit. Out of all the more exotic filters the Apexi filters have been tested to give both the best filtration and least problems on a Scoob.

I've had good success with Amsoil stage 2 air filter
it is a gauze oil-impregnated filter that is reusable.
I've heard K&N filters don't start filtering as well
until they become clogged with debris, thus before
then, they may allow some particles to flow through.
Andrew Mouser

I have seen a few MAF sensors destroyed by bits ofthis foam.I
disassembled them and found small chunks of the foam on the element
AL(CO)

Jason,
the best thing to do, which you have probably already done, is to remove the resonator box from under the front gaurd and open the std air filter box inlet hole to 3". Once you have done that just use the std paper element.
I would like to see someone be able to tell the difference in performance between the std paper and any aftermarket type. The filter itself is such NOT a restriction in comparison to the resonator box and the tiny size inlet hole into the std filter box...
cheers, Rod .. 2c worth..

%99 of filters are oiled
even OE Subaru

unfortunately people make errors when they re oil them and OVER oil them
yes this causes problems

BUT it can also happen with OE

HOWEVER some dealerships and workshops use this as an excuse to deter people
from using them...

OR

as an excuse to solve a problem.

Brett Middleton

MRT Performance
We Rally, You Win.

As Kam stated......there are mixed views.

I've used a pod style filter for about 5 years.....during that time I had a MAF failure......it was intermittent and I hunted the prob for over a year.

I think the main cause was vibrations.....and possibly me over oiling the filter. The filter was a K&N style gauze filter.

Either the foam or the K&N can cause issues with the maf if over-oiled.

Just a comment on what Kam said.....you won't get any oil from the engine on the maf through the breathers as they are post MAF sensor.

I recently put the stock air box back on, and put in a panel type K&N filter. I lost a little high end with how the engine revved....but have added additional intake for the air box to get more volume to help compensate.

Josh Colombo