Big mouth cone filter vs regular cone filter

[RS12Turbo]

My front clip came with a "big mouth" Blitz filter with a 6" inlet. I was wondering if the big mouth style has any advantage over a normal cone filter with a 3" inlet, when used with the ca-det maf? How about later when I swap to a z32 maf?I want to replace the Blitz filter with a K&N since I read somewhere it did horrible in the filtration dept......just trying to decide if I should get one with a 3" inlet or a 6" inlet. Prices are about the same, and I have an adaptor for both sizes.Thanks for any help

[float_6969]

K&N didn't do well either. I've also heard that oil type filters are a no-no with MAFS since the oil gums up the hot wire and makes it read incorrectly.

Apex FTW, but dayum are they expensive...

[RS12Turbo]

Hmmmm, seems like the k & n did way better with filtration than the Blitz filter did.....seems like the Apexi one did the best, but yea expensive!I've used k & n filters on both my '95 maxima, since new, now with 160k miles and my old ca18et which I put about 200k miles on it, and both with the original mafs and no problems.......knock on wood. If any oil gets on the hot wire.....wouldn't it just burn off?How about AEM or Kool Blue, by Accel?

[float_6969]

That's just what I've heard. I've run K&N since I put my motor in and I haven't seen any problems.

[RS12Turbo]

how about normal inlet vs big mouth..............any difference in flow or anything?

[Chris859]

I have personally had problems with k&n filters on maf equiped cars, both my own, and ones I have worked on. All though, the problem can be fixed simply by cleaning your maf every now and then - and no, the oil/cotton fibers will not burn off. When the maf gets dirty from the k&n(as well as other oiled element filters), basicly the maf reads "colder"... aka thinks more air is going in and can cause a rich condition.

[missionsix43]

Run either a K&N or ITG, both are RACE proven filters. Just use the same size inlet as the MAF/Tubing that you are using, if you plan on upgrading, then get a larger size.

If you are concerned about oil then remove the filter and spay some MAF cleaner onto the maf after a few days, then a few days later repeat, until you feel it is ok. They only really "leak" oil when they are freshly oiled.

Just because all of the Japenese companies have much higher prices does NOT mean they have better products, someone needs to broadcast this on the news or something, jesus.

[MasterZenki]

K&N didn't do well either. I've also heard that oil type filters are a no-no with MAFS since the oil gums up the hot wire and makes it read incorrectly.

Apex FTW, but dayum are they expensive...

i say f^*k it and either test them all yourself and pick favorites or find out what people think are good that are supported with facts and get one ...lol i just bit the bullet and bought an apex....but its only because i trust apex and the engine swap came with an old smashed apex filter....

[float_6969]

Testes have been performed.

http://www.nicoclub.com/articles.php?id=180100

http://www.mkiv.com/techarticles/filters_test/2/

[Sil40sK]

HKS Supermegaflow FTW! haha, actually I'm only using it because I got it for free with my Z32 maf, the cage part around it is kinda rusty, and the element crumbled away in my hands. Truthfully, buy whatever you want. The main reason people with maf cars get problems with oil-type filters (such as the k&n) is because they put WAY too much oil on the filter, it's oil supposed to be a few drops to keep the element from dry-rotting and slightly aid in filtration. If you are getting a Japanese filter though, I'd say go with Apex'i or K & N if it's going to be more of a street car, and am HKS or Blitz if it's going to be more of a track car, that's how a majority of japanese muscle cars I've seen run.

[RS12Turbo]

Thanks for the responses everyone..............but back to my original question.Do the big 6" inlet filters have any performance advantages over the standard 3" inlets? I wouldn't think so since the maf has a 1" hole through it......haha! I'm still considering k&n..........got it narrowed down between two........one has the 6" inlet with a solid top, like thisand the other has a 3" inlet with an inverted filtered top, like thisI would think the one with the 3" inlet and inverted top would flow a little more than a standard solid top.....regardless of the inlet size......wouldn't it?

[Sil40sK]

Get the 3" inverted top one

[MasterZenki]

uhhhh sure? i gess? lol you can try putting your mouth on it and see which one gets more air flow when you suck in....lol jk....but yeah one thing i found about Apex filter is that it has the vortex top which allows the air to flow with less turbulence....

[float_6969]

I can't see that there would be any flow/performance gain to be had from a largemouth vs. 3in diameter inlet.

That is unless you're looking at the JWT POP charger. It uses the large diameter, but has a CNC'd thing that fits in the bottom of the filter and is supposed to increase air flow.

[RS12Turbo]

That is unless you're looking at the JWT POP charger. It uses the large diameter, but has a CNC'd thing that fits in the bottom of the filter and is supposed to increase air flow.

Is that the same thing that comes with the Blitz SUS filter? Because I have some big cnc'd adaptor thing that the filter sits on....but I think what you are talking about is something different..... like a big air horn thing......right?

[WI_S14_Goldie]

[RS12Turbo]

Hmmmm, am I looking at this right? Apexi filter for $39http://www.nengun.com/apexi/po...ilterOr is this just for the filter element or something?

EDIT Nevermind..........looks like $60 for filter and Apexi adaptor....still not horriblehttp://www.nengun.com/apexi/po...ersal


Modified by RS12Turbo at 7:13 AM 3/20/2007

[RS12Turbo]

Ehhhh, I finally broke down and ordered an Apexi filter from Horsepower Freaks........price was pretty decent. Should be here in a few days.Thanks for all the help everyone

[dattodude]

I just dynod my CA18 after fitting a pod filter box section. The pod filter cover was made out of aluminium and left maybe 16 square inches of k&N filter surface area.

It showed no big drop in power output. If the filter is clean...shouldn't be much difference in the 150-200rwkW range.