I looked into this a few months back.  That hose that you put a breather on, is for your PCV (positive crankcase ventilation) Valve.  Its an emissions thing.  I did the same thing with the washer cap, then noticed later on my car, that it ran better with the hose there.  I removed the PCV Resonator box out completely and ran a new hose from the elbow in the stock hose to a Barbed fitting pushed into the rubber grommet that the resonator box was mounted too, then pushed that into the intake opening, and clamped down.  Perfect fit.

Here is an old pic from way back before the grommet trick.



BTW, your breather valve is eventually gonna get clogged with oil that passes by the PCV valve.  I suggest a catch can.

Last edited by Djtorello (2008-09-04 09:25:47)

DJ, so is this benefical or not?

I don't want a rough idle, but if it gives me a little better tone and helps me go a tad bit quicker around I'd be ok with it. Also emissions I have no concern for as well.
Perhaps you could give a more indepth discussion about it? And some more pics please.

So let me tell you my story about that damn little black box. If you have one of the TBS MajorMods was selling and you install the CAI, this little box will not fit in correctly. My brother failed to tell me when I let him take over that part of the installation that it doesn't fit right. Well... if its in there wrong it may break the plastic seal on the lid of that piece. Check Engine light comes on when that happens. It turns out that it was sucking too much air in unMAF and dirt was getting through. It took a month and 2 trips to the dealership with the light on for them to figure it out. First time they said it was something else. So... I suggest that I would do that above and they said that they wouldn't recommend it. I can't remember exactly the explaination, but it was something ending in oil may leak out the filter ontop the cover.

LittleRedMachine wrote:

James200319 wrote:

So let me tell you my story about that damn little black box.

Sorry, that part made me laugh   lol

What I'm not getting is why oil would be leaking out of this tube? It's connected into the stock intake in the first place and I wouldn't imagine they would want oil coming out of this valve into the intake. Unless I'm reading you guys wrong somehow... lol

That part is funny :-)

I think because when its in the box air is being sucked through the intake and air is "forced" if you will down into that tube. If its left there with a filter on the end, nothing is being "blown" into the tube leaving whatever would usually have pressure on it out.  So I think that is where he came up with the oil.

Thoughts?

Is the intake plugged like my second picture? It will stall if not.

tommymel wrote:

i have no breather hose maybe cause its an automatic i dont know.. its hard to explain when your a noob.

No, you're good. Personally, I encourage questions from noobs because how else will they learn?

When you take that blackbox off, you have a huge opening(ok, maybe 2-3" wide) in the intake that this connects to. On the opposite side of the box, there is a smaller hose. That is the hose that we are talking about. If you were to take the box off, you would know what I mean. When you see the inside of a box... its a joke. I want to take mine off like his too.

tommymel wrote:

ok so i follow everything so far. but why would the smaller hose not be connected to anything with the back box still hooked up. sone said it was a breather hose for the tranny awhile ago perhaps why i dont think i have one?pretty much my cai connects to the black box on the right side, then snaps into that hole on the bottom and on the left side is a small hose connect to my valve cover

They are talking about removing the black box and putting a breather filter on it and, voila! you're done. My information is just about what the blackbox does and how mine failed terribily. There is one for the 6spd man that ends up just flopping in the wind because there is nothign to hook it up to. This hose is like he said above... a crankcase breather hose.

Hmm... I wonder why I'm noticing such an adverse affect to it.The car pulling harder could be slightly in my head... but, the tone definitely improved...

I'll play with it more later. I'm job hunting right now.. lol

i haven't had an issue with idle at all.

Tommymel.  My engine is the SE-R.  You have the hose, its under the box.  Cavity 2 is the name of the box, it helps lessen the tone of your intake.

your PCV valve opening in the valve cover goes to the left side of the box.  The box is empty.  The right side connects with the Intake.  The purpose is for vacuum recircurclation of oil blowby.  Sensing oil into your intake track to be burned up helps with emissions.  Oddly enough.  Many people dont like sending oil into the intake track, simply because it can hurt performance by having dirty oil build up in the throttle body and intake manifold.  To simply remove the box, with out effecting Idle, you need to have a hose from the valve cover and connect into your intake tract.  you can go about this 2 ways.

1) like on mine, you can route a new hose from the valve cover to your intake tract using a barbed fitting and the rubber grommet the box was mounting to.

2) you can get a new hose, connect it to a catch can, then into your intake tract.  This effectively prevents oil from getting into your intack tract, and still completes the circuit persay. 

on the SE-R, you can leave the intake opening open,  I dont suggest it though.  You wont stall, but your idle will be very high, as well as you will be pulling in more air then what your MAF reads as well as it will be unfiltered, dirty air.

You so have a Transmission vent hose.  Does not connect to the intake directly.  But it is originally connected to the exterior of the stock intake box by a clip. It just sits there.

Ill take better pics later.

whysoSERious wrote:

So if you remove this box, are you gonna fail smog or something? If not, I'll look into doing this as well.

You wont fail smog.  Its there to reduce the noise of your engine.  Average consumer wants a quiet and comfortable ride.  vehicle manufacturers add extar resonance chambers to produce  or reduce enigine noise.  Other then the function to reduce noise, it just connects your PCV to your intake.

If you just put a breather filter on the end, what is the chance of it leaking oil out? (cuz that filter looks cool)
Also, since I have the injen CAI, does it matter if i put the barbed fitting into the piece that replaces the stock rubber grommet? I dont really wanna fuck with it and put a hole in it, because if i somehow fuck up, im screwed because i only have one.

jc723 wrote:

gesh there is so much missinformation in this thread is not even funny..

pcv is big part of emissions BUT its not just "and emissions thing" please read more about the pcv system before you start messing with it..

http://en.wikipedia.org/wiki/PCV_valve

quote from the article "A plugged or malfunctioning PCV system will eventually damage an engine. " = say hello to oil leaks !!!

oh and btw.. yes you will fail smog as it is part of the visual inspection!!


how much HP you get from doing this?? .1hp??? worth it??

your right, you should read better.

As long as there is a hose from the Valve cover to the intake, you will not fail.  If you really want to keep oil blowby from out of your intake track, use a catch can.

Not a single person here said to plug it up.

also, not all states that have smog inspections to a visual inspection.

good day.

tommymel wrote:

so torello the transmission hose do you suggest a filter on it or its not even worth it. and if i just leave the box as it is without the reroute hose will damge occur to my maf etc. as o right now my car is running fine. just alot of vibration at the higher rpms

Nothing is needed for the transmission vent hose.

as for the removal of the triagular box, as long as there is a hose connecting the valve cover to the Intake, you wont have any problems.

whysoSERious wrote:

So for the hose, im guessing the best route is to use the catch can, not the breather filter.
And also, how often do you have to check/empty the catch can?
Oh, and any advice on doing it with that injen rubber grommet?

Catch can would be your best best. Gurov has an awesome write up in the How-to section on how to make one.  If you see the oil blowby getting close to full, then by all means, empty it.

I used the large grommet that help the traingular box into place.  Thats the same size as the opening in the injen intake and stock piping.  I used a 2 sided brass barbed fitting from home depot.  Cost me a whole $2.  One size go to the hose, the other to the open side of the grommet.  Its a tight fit, but it will fit.

Ill get a pic in the morning.

Thanks for the pics, but it gives me a few questions.
1. why did you cut the hose?
2. What size barbs did you use?
3. what is in the hole of the grommet?

One final question for you:
How come you don't use a catch can?

I take it that instead of the barb just going straight into the grommet, it goes into the catch can, and then the barb on the can goes into the grommet?

on another note, i do want to do this, im just afraid of fucking it up and being screwed.

I would assume even stock would be blowing hot air into the intake. I thought the whole point of this was to remove the resonator. I could also be wrong.

Well if you put that breather filter on the end, and dont connect to the intake, then you will prolly run your intake a little more efficiently, but then i guess there is a risk of oiling leaking out.
The car seems to pull pretty good the way it is, I just wouldn't mind hearing the intake a little more. But as stated, im afraid to try it, becuz if i somehow fuck it up, im screwed and gotta pay to either have it fixed, or somehow fix it myself.