[Cloud9...68]

I can't remember reading about this before, and nothing came up in a a search, but do our cars have a filter to clean the air coming into the cabin through the A/C ducts? Newer cars all seem to have them, but I didn't see any reference to it in my owners manual. Thanks.

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[flash]

none of the cabs i've seen do



all of the 94 and 95 hatchbacks i've looked at do have filters located under the hood - not sure about 92 and 93 though

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[bob blackwell]

The 92 & 93 Coupes have a thick, wire mesh filter on each side of the fresh air intake for the ventilation system. Only keeps out big pieces of trash, birds & things. I have used HEPA quality furnace filters to cut out replaceable filter elements for my cabin air and it works well and is inexpensive. Just snap off the wire cover and use it as a template to cut out the filter material. One furnace filter lasts for about 8 or 10 filters for the car. (depending on how careful you are when cutting it out). The 94 & 95 filters are a different size and shape ans will not fit on the 92 & 93 (they cost a lot at the Porsche Dealer too!) Good luck, Bob Blackwell.

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[Anchorman]

My '95 cab has the air filters.

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[flash]

really? i'll have to check a 95 here to see if that's normal or not - i've never seen them in cabs - it would make sense that they used the same box, though in a cab it seems somewhat pointless to have filters

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[Anchorman]

Remember, not all of us can keep the top down all of the time. As a matter of fact, that strikes me as another weight reduction item for you - make the tonneau cover and remove the top (and motors, and mechanism). Oh, and let's not forget the switch! <img src="/forum/images/smilies/968/tongue.gif" class="smilie" alt="" />

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[flash]

lol - do you think i haven't already thought about that?

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[badberry68]

If those filters got dirty and clogged could they affect the performance of the cooling system?

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[Cloud9...68]

[quote name='bob blackwell' post='37055' date='Jun 15 2007, 09:22 AM']The 92 & 93 Coupes have a thick, wire mesh filter on each side of the fresh air intake for the ventilation system. Only keeps out big pieces of trash, birds & things. I have used HEPA quality furnace filters to cut out replaceable filter elements for my cabin air and it works well and is inexpensive. Just snap off the wire cover and use it as a template to cut out the filter material. One furnace filter lasts for about 8 or 10 filters for the car. (depending on how careful you are when cutting it out). The 94 & 95 filters are a different size and shape ans will not fit on the 92 & 93 (they cost a lot at the Porsche Dealer too!) Good luck, Bob Blackwell.[/quote]



Thanks for the info. Where exactly is the fresh air intake located?

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[RPM]

If those filters got dirty and clogged could they affect the performance of the cooling system?

I just did the HEPA modification that Bob describes on my car. So far no problems with interior cooling and we have already had some hot and humid days.



Paul (prj24149) had installed the HEPA pieces in his 93 just before spring here in NC. When we looked at them three months later it was amazing how black, green, and nasty they were. Sort of scary that all of that dirt and pollen could get in the cabin. Glad I did the mod.

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[gryphon]

My 94 cab has the filters, my 93 cab does not, although I may add them later.



Tom

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[flash]

looks like another "dividing" line diference - my 718 code 94 cab does not have them



lol - as it is against my religion to have the top up, and assumed everyone else felt the same way, i presumed it would be a wasted feature in all cabs



turns out they just used the same box - makes sense since all cabs started out as hatchbacks



hmmm - another mod for me to do?

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[RPM]

It was very easy to pull the two grill covers located just ahead of the windshield base and cut up a filter to fit. A 10 minute job.

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[bob blackwell]

And yes, there will be less air flow if the filters are allowed to become clogged up. This has not happened on my car and I usually change the filter elements when I change the oil & filter (5,000 mile intervals, which is usually less than siz months). good luck, Bob Blackwell.

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[Cloud9...68]

[quote name='RPM' post='37102' date='Jun 15 2007, 05:00 PM']It was very easy to pull the two grill covers located just ahead of the windshield base and cut up a filter to fit. A 10 minute job.[/quote]



Thanks, that does sound pretty easy. Could you describe in a little more detail the type of hepa filter you guys have used? For example, how thick is it, and what type of material is it made of (paper, or plastic?). There are so many types of furnace filters out there, that it would be helpful if you guys could point out what has worked well for you. Sounds like a very useful mod. Thanks! This truly is a great forum.

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[SILVY968]

my 95 has them also.

Brian

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[bob blackwell]

The filter that I use is just a common, HEPA quality, furnace filter from Home Depot. The filter media is not very thick, looks like paper with an extruded aluminum bracing on one side. It has pleats/folds and is contained in a one inch thick cardboard framework. I remove the filter media from the cardboard frame and smooth out the pleats prior to using the metal grill from the car fresh air inlet as a template to cut out a piece to fit when I reinstall the metal grill on each side of the fresh air inlet. This is under the hood, back by the base of the weindshield. Good luck, Bob blackwell.

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[flash]

ok - i think we have now established that the filters were integrated at the same time as the engine bay cover deletion and change of seat pattern, etc that occurred in the middle of the 94 cars, starting after the 718 code 94s



the filter size looks pretty darned close to the one i use in my vacuum cleaner - i'll have to check that

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[RPM]

I went with the cheapest furnace filter I could find. Avoided the ones with aluminum mesh since they would be harder to cut. I also did not want a particularly good (read restrictive) one so as to retain as much airflow as possible.



Just looked at them this morning while hanging out at our local PCA Saturday morning 'Koffee Klatsch.' They were still clean and white after a few weeks of use.



One of the members showed up in his new GT3RS - in orange. What a frightening looking and sounding vehicle. Beautiful and ugly at the same time.

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[Cloud9...68]

[quote name='bob blackwell' post='37114' date='Jun 16 2007, 09:11 AM']The filter that I use is just a common, HEPA quality, furnace filter from Home Depot. The filter media is not very thick, looks like paper with an extruded aluminum bracing on one side. It has pleats/folds and is contained in a one inch thick cardboard framework. I remove the filter media from the cardboard frame and smooth out the pleats prior to using the metal grill from the car fresh air inlet as a template to cut out a piece to fit when I reinstall the metal grill on each side of the fresh air inlet. This is under the hood, back by the base of the weindshield. Good luck, Bob blackwell.[/quote]



Great, thanks again. But the $64,000 question - will this filter keep out the dirt and sand that gets kicked up when I enter a corner too hot and go flying off the track? <img src="/forum/images/smilies/968/rolleyes.gif" class="smilie" alt="" />

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