2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Which air filter?

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Old May 2, 2007 | 08:24 PM
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Which air filter?

Could anyone reccomend me an Air filter for my NA 88? I was working on it today and lifted up the unit housing the filter and it was shot. The rubber was like jelly, it was fun to clean up .

Anyways what is the best brand of air filter for it? I've heard K&N but want to confirm that.
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Old May 2, 2007 | 08:42 PM
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I got a K&N and it works well, don't expect any extra perfomance though, it's just a filter. You could just a well replace it with a generic paper one, it does the job.
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Old May 2, 2007 | 08:45 PM
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K&N. hands down. but do your research. Some places charge waaay too much for kits. I got the adapter off of ebay for 10 bucks with shipping included and then got an s2000 K&N filter from autopartswarehouse for 30 bucks. instead of paying 70 dollars or whatever for the same dang thing.
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Old May 2, 2007 | 08:58 PM
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http://cgi.ebay.com/ebaymotors/K-N-A...spagenameZWD1V
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Old May 2, 2007 | 09:04 PM
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the stock air box is functional and can be modified a touch on the inside use a stock K&N u will deffinatly be in better shape then u are now!
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Old May 3, 2007 | 08:50 PM
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I like the blitz sus, very fine steel mesh never has to be cleaned and oiled
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Old May 3, 2007 | 10:23 PM
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K&N indeed, just got my oil change and that thing is in there.
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Old May 3, 2007 | 10:24 PM
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sorry wrong topic, not K&N oil filter, i mean K&N air filter
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Old May 3, 2007 | 10:25 PM
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i heard of HKS are good too but those you need to search around for.
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Old May 3, 2007 | 10:32 PM
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No, HKS and Blitz filters are not even close to as good as K&N or similar (Bonez, Apex'i). They all have nearly identical power gains but the blitz and HKS don't filter as well as the oiled ones, which as as good as you can get.
If you are going to go with a cone filter, get the Bonez kit. It is good quality (much better than most ebay stuff) and cheaper than the apex or K&N units but functionally the same.
If you wish to stay with the stock filter location, get a K&N. They are more expensive but pay for themselves in a relatively short amount of time since they are reusable. If you don't get a K&N, get a wix or something of similarly good quality. Whatever you do, don't get a fram.

That said, if you still want the HKS filter (looks?) I have a used one for sale for 40 plus shipping without the filter.
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Old Oct 8, 2007 | 11:57 AM
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K&N is **** Blitz or Apexi are the way to go

http://www.mkiv.com/techarticles/filters_test/2/
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Old Oct 8, 2007 | 12:01 PM
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K&N is the best hands down, i bought the K&N drop in when i first bought my car then after that i bought the K&N filter injection preformance kit for $100 retail was $150 so i grabbed a great deal. Do your car good and get a K&N
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Old Oct 8, 2007 | 01:28 PM
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Originally Posted by synergy7
K&N is **** Blitz or Apexi are the way to go

http://www.mkiv.com/techarticles/filters_test/2/
I swear, why do people feel the need to necro threads like this?
Btw, I bought the K&N about 5 months ago XD
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Old Oct 8, 2007 | 01:46 PM
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Originally Posted by celbii
Anyways what is the best brand of air filter for it? I've heard K&N but want to confirm that.
The stock Mazda filter will have the best filtration. K&N products filter nearly as well as the Mazda filter, but flow a little better.

Originally Posted by CarzArKoo1
i heard of HKS are good too but those you need to search around for.
HKS is fine, but the filters get dirty pretty fast (about 10K miles in my case) and then you need to buy another one. There is a false rumor that the foam types disintegrate, but I think this would only happen when used way past their intended useful life, as I have never seen this happen when used properly.

Originally Posted by synergy7
K&N is **** Blitz or Apexi are the way to go

http://www.mkiv.com/techarticles/filters_test/2/
Unfortunately, that article is ****. It is an infomercial written by Apexi vendors, and of course they didn't bother to use the proper SAE J726 test procedure... go figure, lol.
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Old Oct 8, 2007 | 07:26 PM
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let us be real honest now... paper or knn or cone filters... nothing flows less than the afm (s5 atleast).. so.. whats the point of 50+ filters? ill stick with my papers..

until rtek comes out with something to eliminate the afm.
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Old Oct 8, 2007 | 09:15 PM
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oiled filters are known to cause problems with sensors... maf sensor's are really sensitive but any filter will do. k&n's are a bit pricey but everyone had their opinions on what work best. try one and tell us how it goes
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Old Oct 8, 2007 | 09:44 PM
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Originally Posted by Mechanic
let us be real honest now... paper or knn or cone filters... nothing flows less than the afm (s5 atleast).. so.. whats the point of 50+ filters? ill stick with my papers..
It's not whether the filter flows more or less than the AFM, it's how much a given filter reduces the airflow to the engine. This is the case even when the AFM is eliminated, as well as with carburetors.

The point of high-performance air filters is to increase performance (go figure, lol). This is why you may have noticed many professional race cars with K&M or similar filters.

Originally Posted by Mechanic
until rtek comes out with something to eliminate the afm.
Why wait on Rtek when Microtech, Haltech, Motec, Wolf, Megasquirt, Electromotive, SDS, Autronic, AEM, and Link have been able to do this for years?

Originally Posted by 13b_cookie_monster
oiled filters are known to cause problems with sensors... maf sensor's are really sensitive but any filter will do.
Our cars do not have a hot wire type MAF sensor. It is a myth that all oiled filters cause problems with hot wire MAF sensors, although I am sure that an over-oiled filter would at least cause a temporary problem. More about the myth here:
http://www.knfilters.com/MAF/massair.htm

Last edited by Evil Aviator; Oct 8, 2007 at 09:49 PM.
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Old Oct 8, 2007 | 11:13 PM
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Evil is pretty much spot on. I just want to reiterate the fact that rotary engines are VERY sensitive to particles coming in through the intake. You will kill your engine if you get a shitty filter.

I run an apexi cone, had a K&N drop in before that. Both are awesome quality filters + I highly recommend either to anyone. I would stay away from anything else, even stock filters.
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Old Oct 9, 2007 | 06:45 AM
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Originally Posted by Evil Aviator

Why wait on Rtek when Microtech, Haltech, Motec, Wolf, Megasquirt, Electromotive, SDS, Autronic, AEM, and Link have been able to do this for years?
.... first off... i am not rich like you... and the rtek is pnp.

but thanks for letting me know what i knew already.
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Old Oct 9, 2007 | 06:57 AM
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Wink

Originally Posted by Mechanic
.... first off... i am not rich like you... and the rtek is pnp.

but thanks for letting me know what i knew already.
ouch it was just a sugestion. and you dont have to be rich, just good at budgeting your money or just get a second job

here are my two favs, they both have a down side but i tend to use the HKS because i believe that foam will flow a tad better than paper or cotton.
KnN years of proven excellence but a pain to maintain(cleaning and messy oil)
HKS just as good but more expensive in the long run(always having to buy replacement foam)
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Old Oct 9, 2007 | 08:31 AM
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Originally Posted by Evil Aviator
Our cars do not have a hot wire type MAF sensor. It is a myth that all oiled filters cause problems with hot wire MAF sensors, although I am sure that an over-oiled filter would at least cause a temporary problem. More about the myth here:
http://www.knfilters.com/MAF/massair.htm

Sure, use a manufacturer document to disprove it is a myth. Isn't that like trusting Marlboro when they told you that cigarettes are not addictive and certainly do not cause cancer? I know for a fact that K&N filters can cause problems with the Hot wire MAF. It happened to me. After numerous trips to the dealer to diagnose a throttle hang and surge issue they informed me that the K&N was the problem. Replaced the MAF and I put a factory filter back in. The problem went away and never came back. The problem started shortly after installing the K&N. I will never use one of their filters again on a car with a Hot Wire MAF.
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Old Oct 9, 2007 | 09:16 AM
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if its stock just get a k&n drop in replacement
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Old Oct 9, 2007 | 09:26 AM
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u said u replaced the maf could that not have been the problem all along not the filter?
i just kno that stealerships near me always try to blame faulty machinery on aftermarket modifications

anyway back to the subject since we dont have hotwire maf sensors we do not need to worry about it k&n is a high quality filter for a reasonable amount of money if u wanted to save money u bought the wrong car
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Old Oct 9, 2007 | 09:54 AM
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Originally Posted by dw89s5
u said u replaced the maf could that not have been the problem all along not the filter?
i just kno that stealerships near me always try to blame faulty machinery on aftermarket modifications

anyway back to the subject since we dont have hotwire maf sensors we do not need to worry about it k&n is a high quality filter for a reasonable amount of money if u wanted to save money u bought the wrong car
Replaced under warranty. Problem started and ended with installation and removal of K&N. They replaced the IAC several times before replacing the MAF.

back on topic.

I am currently using a POS Autozone Cone airfilter. Used an HKS for many years. Replaced it when the filter element fell apart and have not ordered a new one (had a track day the next morning and needed an immediate replacement). I noticed an immediate increase in low end power when I put on the HKS and removed the stock airbox. It also makes and awesome sound from the intake. My HKS though was over 11 years old when the filter element died.
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Old Oct 9, 2007 | 02:45 PM
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Dude if your planning to do a TII swap or any other swap meaning not using your motor you have now. An Ebay kit for less than $20 shipped will work. personaaly i have found the ebay filters to run better than my messy K&N but its all up to you all performance will be around the same. the only way u could get more power would be dealing with the intake pipeing wich would have to be custom and a cold air box custom also. the only time i have seen any difference in power between cone air filters was when i ran with out a filter but it doesnt do much and i would not advise it at all.
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