Sideways7

iTrader: (7)

If you get some water into the intake its not a big deal. I rode in BDC's car which has the filter in the fenderwell. It was pouring and when he hit a big puddle the engine sputtered a bit, but still ran fine.
Also, why is it I'm not seeing any pics except maybe 1 or 2?

RotaMan99

One of the reasons I don't like the filter in the fenderwell. I try to avoid issues that may make the engine run like crap.

cpubugs

I am still curious why some leave the baffled stock tube on. I have seen a few people say that it atomizes the air but it seems to me we port and polish things to smooth them out so there is less restriction correct? Especially important on NA's. Air like water and electricity takes the path of least resistance so being that engines are like air pumps in theory a smooth un-baffled as straight as possible would be the best choice. Would it not?

clokker

iTrader: (2)

"Atomizes the air"?
I think not.

I can see two reasons to use the stock intake tube...
- It's easy cause it fits properly and has all the necessary fittings
- The material resists heat soak

I suppose that a formed smooth tube would net some gain, not sure it'd be significant though.

RotaMan99

The only reason the tube is ribbed is to reduce the vibration transmitted form the engine to the AFM to keep the AFM's measurments more accurate. Its made of rubber because its cheaper, flexible and yes it does transfer heat less but still can get heat soaked.

Going to a straight tube will net you fractions of a hp considering the amount of CFM our stock port engines consume and the diameter of the tube.

You want the intake manifold rough on the walls to help keep the fuel atomized in the intake charge, otherwise if the manifold walls were polished, fuel could soak the walls you would loose power.

mali_FC

the hose is part of the air system

Macrophobic

wait whats wrong with having a hood scoop that feeds into an enclosure, this way you keep the hose as short as possible with the least about of bends while still feeding it cold air...?

clokker

iTrader: (2)

Here's mine, just made it today (details here)...

CarzArKoo1

sorry to ask again, how much gain do you think you have after changing from OEM air box to this?

phoenix7

Increased drag lowers your MPG, slows you down and the 3-5 hp you gain (if that) are lost to the drag. Which is why a Z3-like fender INSERT seems to be better than a SCOOP that rises above the stock lines imo.

I saw an FD with a small scoop online (AB FLUG FD)a while a go and thought it was a good idea too but I think the added drag nullifies any gains.

clokker

iTrader: (2)

I suppose it depends on how you define "gain".
*Yes, I am a semantics *******...*

I can make no performance claims as I have no dyno data nor any way to measure intake temps.
I can only hope I didn't make it worse, performance-wise, while praying that maybe, just maybe, the intake charge will be cooler and higher flowing than stock.

Aesthetically, I think it's a big improvement and that was certainly a factor in my decision to proceed.
In my case, I also needed to replace the stock air filter so I decided to do this instead.

My install breaks lots of technical rules (a better, more performance slanted method would be AllMotorRotor's install here) but I had more constraints to deal with than straight up performance.

Nick86

iTrader: (1)

Mine has been well documented here:
https://www.rx7club.com/showthread.p...0&page=5&pp=15

stage3_rx7

Mine is made from tubing off a supra and random other parts idk im kinda ghetto...

cozmosland

iTrader: (1)

i like nick86's..

how well does it work?

cozmosland

iTrader: (1)

can we get some more examples?

SDrotary-FC

my old set up from 2003



my new set up is going where the washer res. was to pull in some cooler air

Nick86

iTrader: (1)

It works very well. The filter gets a ton of fresh air, it stays dry in the rain and there is no convoluted bends for the air to follow.

shika805

iTrader: (1)

^looks well built, thinking of doing this definitely

Rx-7fetish

Heres where i modded my stock air box, would be completely useless without the headlight vent.


And here is where i made a custom intake pipe for around $30, writeup soon to follow in new thread.

toastiepenguin

iTrader: (3)

I like the Stock Air Box the best.

It just seem like all the fabricated CAI's and other cone air filter adaptions are basically re-creating the the same stock design.

I'm strictly speaking for NA rx7's here because that is what I have. By all means I'm not putting your guy's ideas down or anything I'm just saying what works best from my experience in daily driving my car.

SDrotary-FC

something like nick86's pulls cool air from down below not on top of the rad. like the stock setup every lil bit counts on a n/a

shika805

iTrader: (1)

i think nick86's is a great well thought out design, i am currently trying to find a design for my S5, alot of these designs are for S4's, in the S5 i can tell therese's less space to build a cold air box.

eage8

iTrader: (9)

I've heard stock prelude ones work really well, but never actually seen one done.

I used a prelude one for mine because I got it for free, but I have a TII so it was modified quite a bit

because this thread needs more pics... here is mine on my TII

shika805

iTrader: (1)

More pics guys! there has to be more people with more setups???