Eriks85Rx7

So I recently had my car rebuilt and ported. I have a free flowing exhaust but I feel that maybe my stock air box maybe restricting the flow. The ports can only flow what comes in..
So my question what is the best intake for my NA 13B streetport.
My current setup: Drop in KN stock filter replacement. 63.00$
HKS Super Mega Flow Air Intake ( dome style filter) 138.00$
KN Fuel Injection Performance Kits Gen1 Air Intake 193.94$
All the filters above are found at http://www.horsepowerfreaks.com/perf...es/Air_Intakes

Then
Bonez Racing Intake 109.95$
http://www.rx7.com/store/rx7/fcintake.html

There are a variety of prices, I just want to get a good intake have it done right.
Does anyone have experience with these intake kits?
The stock air box acts like CAI system but these will not due them just being open and sucking in engine air. (though cold air may come through the headlight?) Will these help make my streetport make more power?

Malikai229

iTrader: (4)

Everything I've read about this topic says you really don't gain anything by removing the stock air box for the cone filter because of the under hood temperatures. The only real way you can use the cone filter and gain power is building a box for under the hood near the headlight. I saw a thread a few months ago about a guy building one and maybe producing more for people who were interested and willing to pay the $$.

Heres the link.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/diy-cold-air-box-830116/

Good luck bro.

Jimmy2222

iTrader: (3)

I have an SMF reloaded kit from HKS on my T2, it's alright, but it's sucking in hot air. To get the most from your new intake you're going to want a cold air box or fab one, saw this (http://www.mariahmotorsports.com/eng...iah_airbox.htm) in another thread and I plan to pick one up some time soon.
As buc said, many people have noticed there's not a whole lot of gain from the cone filters alone due to the under hood temps.

RotaryRocket88

iTrader: (7)

Keep the stock box, or make a custom air box for use with a cone filter. Here's the box I made for my turbo: https://www.rx7club.com/showthread.php?t=830116.

freemanrx7

The butt dyno felt diffrent when adding the k&n kit. My NA seemed to have less low end and more top end. Other things will come into play as well. Such as the region you live in. It rarely gets hot here on the coast so the air being pulled in is already pretty cold. When I traveled to the desert the car lost its gusto.


Cold temps + sea level =

High temps + high elevation =

eff_three_see_es

iTrader: (11)

+1

i live at 4400ft and its like 85 degrees. my car wants to kill itself

Evil Aviator

Weber style 6-port LIM with ITBs, standalone EMS running in Alpha-N mode, fiberglass carb-style round filter box with filter, 4-6" intake pipe leading to the front bumper area.

Option 1: Borrow a friend's CAI and see how you like it. They are all pretty much the same thing, and they only take a few minutes to bolt in. I happen to prefer the race-proven long-life K&N filters to the 10,000 mile paper or foam (HKS) disposable elements.

Option 2: Clean your engine bay, disconnect the air box, and make one run to see if you notice any difference. If you like, you can make a temporary cold air duct out of cardboard as long as the pieces are too big to get sucked into the engine if they happen to come apart. Running without a filter for 3 minutes isn't a big deal unless there is a dust storm.

A dyno or G-Tech meter would help determine any significant gains. If you don't notice any difference, then you may as well keep the K&N drop-in for the remainder of its 10 years / million miles.

Yes, that puts you at about 84% SAE relative horsepower.

e36imagica

I'm really happy with my Bonez Racing Intake which I purchased from rx7.com -- although I did not notice much of a power increase, if any. Sounds pretty good though.

Eriks85Rx7

So I kinda disconnected my air box. I just took the cover off and let the filter lay in there and drove it around. I dont know if I am making it up or what but it seemed to help my low end a lot it was pretty loud too. Over all just taking the cover off and having the filter lay in there seemed to make a pretty big difference. If I sealed around the filter with gasket gue so it would it not move and not allow air to by pass it. would this not work as an intake? I noticed a pretty big difference when doing this but... would just an open intake make a world of difference from this?

I want to a get vented head light lid to help bring in outside air too.

This NA is getting pretty quick, (at least it seems to me, I am sure a turbo would stomp it but coming from a NA 12A to this, it seems pretty good)

rnz520

iTrader: (10)

you can do that if you want, go to legacygt.com, because for the scoobys they sell basically what you did, i think its a blitz intake. Some guy made one at home with a K&N filter.
You got nothing to lose by trying, but by being na the fact that you will be sucking in hot air will hurt you because your engine sucks in teh hot air.
When you are turbo you are sucking hot air in to a 400 degree compressor, which then goes to the intercooler, therefore, sucking the hot air from the engine bay doesnt make much of a difference if you have a decent intercooler.

AUGieDogie

iTrader: (4)

I have a Bonez on my 87 turbo and its ok, nothing special just ok. In my 91 turbo I have the apexi and i think its one of the better ones out there.

Definatly build a box if you can.

Terrapin_turtle

iTrader: (2)

So how bad are the $20 ebay cone filters, not great I'd assume?

Evil Aviator

A fully-open intake does not have the restriction of the air filter. Also, the discharge nozzle on the bottom of the stock air box is not exactly designed for performance.

Aerodynamics work such that if there is a world of difference, then it means your current setup is too restrictive. If your current setup is about right, then there would be hardly any difference.

Also, I forgot to mention that you should try not to confuse noise with power. Yes, I know, this is more easily said than done.

The Mazda Competition Preparation and Service Manual recommends a 6x3.5" inlet. Most of the aftermarket headlight vents are too small.

A stock TII only has 182-200 peak bhp. A streetable NA engine is easily capable of this peak horsepower level, but with a better power curve and no lag, as well as less weight.

The difference between a non-turbo and turbo engine is actually fairly slight in most cases.

The cheapie brands tend to fall apart and get ingested into the engine, mostly on turbocharged applications. You get what you pay for.

BuujinBejiita

iTrader: (4)

I actually made my own intake for my old RX-7. I think it was a 91-95 or something V6 accord cold air intake off ebay. The bends are perfect for the RX7. But you have to remove/reloacete the washer fluid bottle the way I did it. Theres a flat spot right behind the passenger headlight and I cut a 4" hole there and ran the piping into it and put the filter pretty much right behind the bumper. I may still have some pictures of it laying around somewhere.

brian_skotch

iTrader: (6)

^I'd like to see those pictures if you can find them.

Eriks85Rx7

I am going to try to get one of the intakes I listed above (so I can make maximum power,) when I have some free cash flow but where I am getting married, buying a house and trying to pay off cars and go to college all at once... its a bit overwhelming.

My current mods are Streetport , headers, full exhaust (no cats or any restrictions besides mufflers) and a "intake". given my current mods, how far off from the TII power levels am I?

Jimmy2222

iTrader: (3)

I'd say you're almost up to an S4 T2, if not there. Streetport is a 10%+ gain, full exhaust with headers is what, like 10'ish. So yeah, you're probably pretty close 10-15 off maybe.

herrafass

iTrader: (6)

I had the k&n kit on my 87 sport, i got a couple extra mpg and a bit more kick in the top end. Low end torque stayed the same. Just 2 cents from my experience. Good luck.