sectachrome

i took a look at my stock filter this weekend, and its all fucked up, creatures storing seeds and **** in it! i figure what the hell i might as well just uprade it now. im debating between either the bonez cone filter, or the k&n one. theyre both about the same price, 120. i dont need to buy any other extra parts, it just bolts on the the existing connection right? does anyone have any input? stock 86 na sport by the way, i dont remember if thats in my sig or not. thanks.

Icemark

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

I wouldn't consider the blitz even for my vacumm cleaner

Pinfield357

youll need an adapbter to fit the cone on to your AFM i think HKS makes them

if you had a s5 then you would not need that extra part but because the AFM on s4 cars is square youll need an adapter to fit the cone filter to the AFM

White_Seven

Wow thanks for that link Ice! I just ordered an Apexi intake now for the T2 conversion I will be starting this coming weekend after I drive down and pickup my front clip!

I've been using a K&N on my 86 N/A for a long while and liked it, but there's no fooling a simple test like that!

Evil Aviator

LOL

The important quote from that article: "It is questionable how accurate the original source of data is".

FYI, the proper test for an air filter is SAE J726.

I don't understand that statement. The Bonez intakes come with either an Apexi or K&N filter, which were the number 1 and 2 rated filters in that "test" you posted.
http://www.rx7.com/cgi-local/2catalog.cgi?cat=7&part=1

$30-50 K&N Universal Filter
$5 K&N Crankcase Vent Filter (For RX-7 Air Pump)
$5-10 Various Mounting Hardware
$20 HKS Adapter for 86-88 RX-7
http://66.216.67.51/product.asp?0=214&1=319&3=553

$60-85 Total

Icemark

My typo... I meant the Blitz stainless style filters

KiyoKix

I currently have the Bonez filter...it's pretty damn incredible if you ask me. But I like the sound of the Blitz filter though . Don't know about the filtration on it though .

SOIA

I have a K&N on my 86 NA I like the looks of it, it was an easy install, all the adapters and parts were included and it came with a recharging kit. Made a huge diffrence powerwise as well.

introVert

Have the Bonez kit, liked the brackets and excellent instructions, but of course I am not very mechanically inclined. The Bonez kit is a bit pricey, and those with fab experience can make their own adapter and brackets fairly easily for less $$$

Rx7Nub

You can buy the bracket's for the AFM off of ebay I think, and someone on the forums also sells them. I forget his name now though.

sectachrome

ummm....sweet! do you know where i can get the vent filter, and mounting hardware?

sectachrome

*bump*

West TX RX-7

I use a Bonez and have been very please with it. Looks alot like a K&N except the end is cone shaped toward the inside instead of just a flat end piece. I don't think RX7.com would sell a piece of crap though. I would hope they have higher standards than that.

Nick86

iTrader: (1)

Universal K&N filters - as well as the Apexi - are shaped like that. I have a universal K&N, and it didn't cost me much at all. I bought the adapter from Rx7 Store.net for $20, and fabbed up a cold air intake. In all it was WAY cheaper than the Bonez Unit.

r3mix

looks liek I'll be getting an Apexi

RX7withNitrous

well i have an hks on my 87 TII should i swap that out for the apex'i intake i have on my s5 na?

Evil Aviator

Most of those brackets do not transition properly from round to square, which will create drag, reducing performance. The HKS adapter has an excellent transition, and it only sells for about $20. Examples:

Good Transition (Smoothly goes from round to square)
http://66.216.67.51/product.asp?0=214&1=319&3=553

Bad Transition (Large lip = lots of drag)
http://cgi.ebay.com/ebaymotors/ws/eB...tem=2419755041
http://cgi.ebay.com/ebaymotors/ws/eB...tem=2419779381
http://www.bnnauto.com/PIC/ebay/AD.jpg

No Transition (totally round, which also creates drag when the air hits the square AFM hole)
http://cgi.ebay.com/ebaymotors/ws/eB...tem=2419732784
http://images.channeladvisor.com/Sel...adapter_f1.jpg

The brackets are just to hold the AFM in place, and hold the air pump hose in place once you remove the stock air box. You can use any brackets, such as stereo brackets or brackets from the hardware store, or you can just make your own with pieces of metal by bending them and drilling appropriate holes. You may also need some bolts to mount the brackets. Zip-ties are another option. Also, I think the cone filter will come with a hose clamp, but I think that you will need to buy a hose clamp for the vent filter. It's probably best just to get the filters, and then decide on the mounting once you remove the stock air box and you can see what you have to work with. You can use the picture of the Bonez intake as a reference, but don't be afraid to design your own. Just make sure everyting is secure, and the AFM needs to be fairly level and not rotated from the stock orientation, although you can point it right or left without any significant adverse effect.
http://www.rx7.com/pics/fc-bonez-intake5.jpg

Most K&N dealers will have the vent filters, and you can also use brands other than K&N. Some of the generic auto parts stores carry K&N products, and you can also order them through the mail or internet. I forgot the inside diameter of the air pump hose, so you may want to measure yours to make sure you get a vent filter with the correct vent diameter.
http://www.knfilters.com/images/cvfsb.jpg

Here are your K&N filter choices. Make sure you get one that fits under your hood and between the frame and other components. A lot of people accidentally get filters that are too long or too wide.
http://www.knfilters.com/universal/universal.htm

If all this sounds like a pain, then you can just pay the extra money for a kit. Some people don't like them, but kits do have their uses.

sectachrome

thanks so much! you rock!