Need help with vacuum, Mystery pipe Options

[Lil-Joe101]

Can anyone tell me where this goes and possible post real time pictures. At the moment I have a min air filter on it. The vacuum from this is so loud and I need to know either where it goes or if I should just leave it as is with the mini filter on it.

[njccmd2002]

on the car that im parting out, that similar part went to the filtler rubber neck, doesnt it?

[texasnick]

I think that's the coolant inlet to the TB.

From the BGB:

[Box]

The two small silver pipes are for the coolant, the one circled is off the IACV. On the 3S I'm not sure exactly where it'd go, but it'd connect to a source of filtered air. So Norberto is probably on the mark so to speak.

[Lil-Joe101]

So Im guessing its ok that I capped it with a mini air filter then correct?

[Box]

Sorta kinda. It'd still be better getting filtered outside air than filtered engine bay air.

[garin]

So Im guessing its ok that I capped it with a mini air filter then correct?

the two smaller hoses are coolant the big hose is air. no you can no cap it. it needs to have a vacuum source! that is the vacuum for the idle air control!

[nics]

It goes to the intake manifold. I have to find the picture.

[Box]

^That was my other thought, and would make sense in his case as I want to say he's been having issues with high idle.

[nics]

It should be behind the intake manifold on the passenger side.

[Smaay]

uughh guys!!! your answers are confusing me!!!! the circled pipe is for the IAC and it needs to have filtered air. it can be a small filter right on the pipe or it can come off the airbox. It can NOT be hooked up to the intake manifold. It has to be static air.

now since this is the FI section, it should NOT be hooked up to anything that will put boost behind it, so if you are boosting this car, put a small filter on it

This post has been edited by Smaay: Apr 20, 2014 - 7:26 PM

[Box]

Then his idle is warm air, eww...

[Smaay]

Then his idle is warm air, eww...

so what, its idle air

[Box]

Hence the

[nics]

uughh guys!!! your answers are confusing me!!!! the circled pipe is for the IAC and it needs to have filtered air. it can be a small filter right on the pipe or it can come off the airbox. It can NOT be hooked up to the intake manifold. It has to be static air.

now since this is the FI section, it should NOT be hooked up to anything that will put boost behind it, so if you are boosting this car, put a small filter on it

Yeah it is confusing. I maybe thinking of the hose from the air intake hose connected to the intake manifold.

[antoine64]

that is the air intake for the Idle control valve. it should be connected right after your filter but before the turbo inlet. it needs fresh air. When I got my car this hose was blocked off and linked to another vacuum line. the car idled like ****.

on the 3SGTE there are several things that need filtered air besides the main inlet to the turbo.

-the idle control valve
-the boost control VSV (unless you disconnected it and used an after market boost controller). this is the air source for bleeding the waste gate actuator to allow higher boost.
-one of the vacuum lines from your power steering pump. when you turn your wheels, a switch on the pump creates a vacuum leak causing a higher idle.
-the crankcase breather. That strange black box on the top of the engine. Sometimes people put little filters on this. don't know much about it. Mine has a dedicated hose attaching just after the filter.

all of these (except maybe the breather) feed air into the engine so filtering that air is a good idea.

Should you need pictures or a diagram I can provide it.

Hope this helps.

[antoine64]

sorry, one more item for this air hose if you have air conditioning. There is a VSV (vacuum switching valve) to increase the idle for air conditioning. That can also go into this air line.

[presure2]

like antone said, it should be connected to your intake piping, pre turbo, post filter.
its fine with a mini filter on it, i actually have a short section of the stock hose connected to the pipe with a filter on the end of that. been that way since the day i swapped with no issues, and is how most guys who delete the stock intake pipe do it.

only thing i would add is that you should think of that just like it was your intake pipe, in that you want a quality filter on there as well. also if its very loud with the filter attached right to the pipe, a short section of hose will reduce volume some.

[Bitter]

Doesn't the air for the idle need to be metered by the airflow sensor? If it's sucking air that's not been measured then you may as well just have a big vacuum leak right?

[Smaay]

there is no MAF on these cars