Porsche Enthusiasts Club Forum

hi i brought a promax chipset when i brought my rear wiper delete bung.

944 S

havent instold it yat as the car in mid respary. read thought the intrusctions, and came a cross a stament tht said mapping will also work with cone type air filter, for maxuim benfits.

so i no this topic normaly gets very mixed reviews and ideas, but has anyone used a cone type air filter or induction kit?
which type and were did you place it?

from what i can understand all is well getting more air but the air beening warm from the engine kind of counter acts the idea, so i was thinking is placed under the badge pannel thought the currnet air intake? or lower down under the engine so it clottects the air push under the car from the chin spoiler?

http://www.automotiveforums.com/t429554 ... take_.html

Americans seem to love putting cone filters in their 944s. I’ve no idea why.

I’ve recently asked the same question over on the PCGB forum and had some very thorough answers. I learned that yes, a cone filter is great if you can get a flow of cold air to it; but no, putting one in the standard position on a 944 Turbo won’t do you any good because it’ll just suck in warm air from the engine bay.

The easiest answer seems to be fitting a cone filter and replacing the badge panel with one that has holes in it. Teilecar make one that looks like the old 924 Carrera GT panel and lots of American manufacturers make ones with wide, flat, oval holes to match the ones you have lower down the front of your car.

I'd be tempted to go to a 924 GT nosecone and an S2 filter setup on an S. But the airfilters are pricier on S2s as a result (try £15 and only seem to be made by Mahle Knecht (I bought mine thinking I didn't need it. Changed it and found out that the old one was newish and not that dirty in the end!).

JMG have done extensive testing on the cone filter setup and could not find any problem with hot air being sucked in and effecting performance. The only time it did effect is when the car was stood still for a long time so no airflow was coming through like on a rolling road. Here's mine and the induction roar is intoxicating I have got a replacement vented badge panel going on later this year though

Hi Andy

Is that a baby K&N filter I spy in the background ? In your engine breather I assume....how do you find it , does it help with fumes/smoke etc ?

All the best Brett

Americans do love the cone filter due the increased volumetric airflow as a result. However unless you are utilising a MAF set-up, with the airflow entry location adjacent to the snorkle inlet (OEM opening behind left headlight), then they are not recommended. Having an air inlet tube/filter utilising the stock AFM/barndoor/J boot that is located in proximity of the radiator is COUNTER-productive. The increased flow you would generate via a more pourous media (such as K & N), is negated due the hot air it is ingesting.

The style/location shown in the above pic is an outdated one, that no one here in the States uses due this fact.

You can always modify tubing to use a K & N filter and stock components, but just make sure you are sucking air from the correct entry point. Behind the radiator is not it.

Hope that helps

From previous posts/comments I have read, changing to a cone type filter offers little over simply replacing the stock filter with a K+N one, and even then the results are very subjective although I am happy to be proved incorrect.

Howard

Hi Brett

Not sure what it is, it just appeared last year with the upgrades. Just assumed it was part of the fueling system. Don't know about fumes as I've still got a problem with the setup which is too long a story but ask Jon because he's still trying to figure out the problem The nip down to the garage to pick car up last Saturday turned into an allday fiddling with different settings

Andy

Hi Andy

Yes that looks like a baby K&N breather filter or its equivalent and assuming thats a breather pipe its in ? Its a good idea if so as you will see it discolour if your engine is breathing heavily...or not

All the best Brett

Andy it is the breather for the oil catchcan (shiny bottle just above the exhaust manifold), which is designed to stop oil vapour from the crank case venting back into the inlet, which reducs power and dirties up your intake

If you look at my under bonet setup you'll see that there is a cone filter and also that someone has made a crude attempt to draw a little air in from outside as opposed to from 'just' from behind the rad. I suspect this is a totally non effective mod they have done but certainly harmless. I have been told by a leading indy/tuner well known here that the hot air problem with a cone filte doesn't really exist in reality and that they run fine.
As the car will be going back on the rolling road very soon , I may repeat the procedure with the standard filter box as well , that would be interesting. Would I see any BHP difference though ?, i suspect not really and is it a realistic test on a rolling road with a bloomin great fan running in front of the car , I'm not too sure ?



Regards Mas

well iv been doing quite a bit of resheach on the net on this one and a few things have come up, 1st k and n fillter let more grit and drit in 2 the engine causing pitting and scouring of the valves. this was tested but some one who races 944 and did a bleed test with gresse? lost the link now.

as i dont have an intercolloer under my badge pannle, 944S with turbo front. i was think a cone placed under the badge pannel, one with the long oval nose vent.( i did like the look of these allready) was thinking off making a vent 2 directed the air stright in 2 the cone. better decide on that one quick as the car will be sparyed next week. but honestly how much extra air flow do i really need to create?

once i get the car back im gone 1st running it and note a frist rev marks- speed marks then swap over the chip, do the same then try a differnt air fillter set up.

i help a lad down my road fit a very large cone on his polo, it did create a much more meater sound. but thts all the gains i can tell about. he was gona place it above the manfold at the front off the engine and igoner his cold air intake as this was the place with the most room. but i talked him in 2 placeint a the back were the old air box was and funeled his cold air intake in 2 the start of the cone, by extrened the cones mouth outwards.sorry pictures would help lol.


once agin just cas its porsche all these after marcket fillters seem 2 be much more expensive then the same 4 other brands,

Thanks Paul and Brett, I'm gradually picking up all these technical bits of information

Mas your engine bay is too clean, I think you need to come down my way to see your old car and show her a bit of TLC

Back on Topic there probably is no gain in the cone filter but the induction roar sounds great. When I finally get me 3" exhaust the sound experience will be complete

Well Iv fitted the promax chip and ibelive , it made a noticeable differnce. Then a few days later I fitted a arplio cone filter, using some dainage from b&q I goti
it 2 fit. This was just a 4" rubber end cap with a small hole cut in 2 it. Are put some pictures up soon. Iv placed it in the same place as andys 4 now. As that only place it could fit with the parts I had. And is also using the cold air feed. I belive the noise has got less below 2000rev and more after 4000revs. Not by much and I think it feels slower.

The cone gets very hot. And you can still feel the heat come off the engine, 5 mintues after it turned off with the bonnet open. Can't see how any other loaction inside the engine bay would be much less hot.

Has anyone placed there cone lower, below the enigine?Would an air box under the car gain the most cold air?

I was thinking of placing it on the inside of the chin spoiler fitted 2 the bottom of the bumper? It's got a base/ floor so should also prevetent spjash from puddles and road deadbres

Or over by the passanger headlight. Byside the coolent. Which is also hot 2 thouch. And remove the bung in the same fender wall.