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Old 12-26-2012, 09:50 PM   #1
scx89
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Default Boost leak help -11 WRX

Mods are

Catback
COBB OTS stage 1
Boost gauge
Oil Pressure gauge

I was hitting boost on a fwy on ramp and I started noticing this weird noise - similar to a failed silent fart.

I just installed the defi boost gauge about a week ago and flashed to stage 1.
(was previously stage 2 w/DP but took that off)

Where does that boost leak sound like it's coming from? I hear it on the left front driver side - so I imagine it's the T connector. I have the T connected mounted about 2.5 inches after the BPV -> T --< Sender & whatever else it connects to lol. I checked the T connector today and it looks okay to me, I took off the crappy zip ties on the tubes and replaced it with 18lb tensile str zip ties but I'm still getting the noise.

Here's a video

I don't think it's the TB --> intercooler because I've had it on stage 2 before and it was all good at 17 psi. I'm only on 15psi w/OTS stg 1

If you look at the video, it rises up to almost 15, makes the fart, then drops to 10 and rises again, and farts and drops.

Any input is well appreciated..
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Old 12-26-2012, 10:06 PM   #2
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check the bpv gasket, or check all your hoses again.
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Old 12-26-2012, 10:13 PM   #3
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Have you messed with the TMIC at all? Check the throttle body hose, each side has a rubber piece that is known to wear. My car was making that noise and this was what mine looked like:



Just take the pieces off each end of the throttle body hose and put it all back together nice and tight.
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Old 12-26-2012, 10:22 PM   #4
scx89
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awesome picture
Throttle body hose is the thick hoses that comes out of the intercooler right?
I just take it off and put it back together? o.0
Do I have to take off the intercooler to access the hoses?
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Old 12-26-2012, 10:27 PM   #5
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Yes, it is the one that connects on the driver side. You will most likely have to take the TMIC off to get to it, and unfortunately because of the position you can't really confirm if thats the problem until you take it off. But if its like me (and a few others on here) once you unbolt the TMIC, it will just slide right off because those rubber things have come lose or ripped.

If you have the stock TMIC, it should only take 30-45 minutes, and even thats being liberal with time. Take the intercooler off, you will see the throttle body hose, each end has the worm clamp and the rubber piece, just take the rubber piece out, then put it back together.
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Old 12-27-2012, 12:38 AM   #6
scx89
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The throttle body rubber hose connector was loose! just like you said stanrc!
I have a couple concluding questions at the end though

For those with a similar noise here are some pics for reference
When I took off the intercooler the rubber connector was stuck on the intercooler and I can also see the side of the throttle body hose coming off


I could tell from the white gooey looking thing on the TB hose


intercooler removal was easy - take off bracket bolts with 12mm and bpv with 11 or 10 mm i forgot. There werent any gaskets on the turbo->IC or IC->BPV so nothing to worry about there. Then you just yank it toward passenger side and it should come right out.


The End
I saw some oil where the BPV opening to the IC opening and also inside the TB hose






should i be concerned or is that normal just to grease stuff up?
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Old 12-27-2012, 06:39 AM   #7
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Glad that was the fix and great pictures. As for the oil, that is the usual blow by from these engines. That shouldn't be anything to worry about.
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Old 01-10-2013, 10:01 AM   #8
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Hmmmm same problem im having...
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Old 01-10-2013, 11:39 AM   #9
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These are good pictures and a very common problem. Even at stock boost this can occur, but any increase in boost makes it much more likely. A bit of oil in these components is normal. I wouldn't worry about it, but maybe check it once in a while because that does look like a somewhat decent amount.

EVERY 08+ WRX should remove those rubber end caps from BOTH ends of the throttle body hose. You should also add a zip to to the vacuum line that goes from the top of the BPV to the back of the intake manifold. The nipple on the intake manifold does not have a barb and can easily slide off.
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Old 01-10-2013, 12:37 PM   #10
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Quote:
Originally Posted by xluben View Post
These are good pictures and a very common problem. Even at stock boost this can occur, but any increase in boost makes it much more likely. A bit of oil in these components is normal. I wouldn't worry about it, but maybe check it once in a while because that does look like a somewhat decent amount.

EVERY 08+ WRX should remove those rubber end caps from BOTH ends of the throttle body hose. You should also add a zip to to the vacuum line that goes from the top of the BPV to the back of the intake manifold. The nipple on the intake manifold does not have a barb and can easily slide off.
I wonder when Subaru will finally make a production change to rectify this issue. It seems there are three common problems people have when increasing boost (they can even occur on stock cars as you noted)
1. Bypass Valve leaking
2. Plastic end tanks separating on the stock TMIC
3. This problem (throttle body/IC hose popping off)

Fortunately the TB/IC thing seems to be an easy fix. I will most likely follow your advice and remove those POS end caps. I will probably invest in some t-bolt clamps as well.
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Old 01-16-2013, 01:47 AM   #11
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Quote:
Originally Posted by xluben View Post
These are good pictures and a very common problem. Even at stock boost this can occur, but any increase in boost makes it much more likely. A bit of oil in these components is normal. I wouldn't worry about it, but maybe check it once in a while because that does look like a somewhat decent amount.

EVERY 08+ WRX should remove those rubber end caps from BOTH ends of the throttle body hose. You should also add a zip to to the vacuum line that goes from the top of the BPV to the back of the intake manifold. The nipple on the intake manifold does not have a barb and can easily slide off.
What exactly is the oil from? I've read that it's blow by and it's a result from the ringlands seals not being perfect and oil slipping past them. Shouldn't it be no oil at all? I need to find a good read on this
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Old 01-16-2013, 08:24 AM   #12
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Quote:
Originally Posted by CO11WRX View Post
I wonder when Subaru will finally make a production change to rectify this issue. It seems there are three common problems people have when increasing boost (they can even occur on stock cars as you noted)
1. Bypass Valve leaking
2. Plastic end tanks separating on the stock TMIC
3. This problem (throttle body/IC hose popping off)

Fortunately the TB/IC thing seems to be an easy fix. I will most likely follow your advice and remove those POS end caps. I will probably invest in some t-bolt clamps as well.
That's a good plan.

Those are all common.

Also the hose that goes from the top of the BPV to the back of the intake manifold can pop off the intake manifold. Needs a zip tie to hold it on. if this pops off it causes a pretty bad boost leak. I don't see this one as much on stock cars. Usually higher boost (20+ psi).

Quote:
Originally Posted by scx89 View Post
What exactly is the oil from? I've read that it's blow by and it's a result from the ringlands seals not being perfect and oil slipping past them. Shouldn't it be no oil at all? I need to find a good read on this
It's blow by. Some cars have more than others.
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Old 01-16-2013, 11:35 AM   #13
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90% of these complaints are due to the Throttle Body to Intercooler hose. The OEM one is crap and breaks open over stock boost levels. I think Subaru did it on purpose.
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Old 01-16-2013, 11:41 AM   #14
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Have you thought about installing an oil ketch can?
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Old 01-16-2013, 12:18 PM   #15
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Quote:
Originally Posted by GT3782
Have you thought about installing an oil ketch can?
Yeah, i was wondering whether to get a catch can or air oil seperator. They look like a pain to find a place to mount them
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Old 08-07-2013, 02:07 AM   #16
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Quote:
Originally Posted by Tripintaz View Post
90% of these complaints are due to the Throttle Body to Intercooler hose. The OEM one is crap and breaks open over stock boost levels. I think Subaru did it on purpose.
I am also experiencing this same problem regarding boost leak, but I haven't taken the intercooler off yet. Just out of curiosity, does anybody know if there is an after market hose that can be attached in order to avoid these leaks in the future? Or will the stock hose be sufficient with the damaged rubber portion taken off?
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Old 08-07-2013, 04:24 AM   #17
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Quote:
Originally Posted by bwoon View Post
I am also experiencing this same problem regarding boost leak, but I haven't taken the intercooler off yet. Just out of curiosity, does anybody know if there is an after market hose that can be attached in order to avoid these leaks in the future? Or will the stock hose be sufficient with the damaged rubber portion taken off?
Here are some aftermarket ones that look promising. Never experienced them myself, so can't give my review.

http://www.avoturboworld.com/avoshop...hose-p-33.html
http://www.tomiokaracing.com/index.p...legacy-gt.html
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Old 08-07-2013, 06:57 AM   #18
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It should also be said BE VERY CAREFUL WITH THE TURBO-> INTERCOOLER BOLTS when removing the IC
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Old 08-07-2013, 08:25 AM   #19
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Quote:
Originally Posted by rquinn19 View Post
It should also be said BE VERY CAREFUL WITH THE TURBO-> INTERCOOLER BOLTS when removing the IC
This is good advice. Put some anti-seize on those bolts before you re-install the IC.
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Old 08-07-2013, 09:25 AM   #20
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As others have said, the oil is normal. The heads release the crank case gases through the PCV system, which is connected to the turbo inlet. This puts a pretty heavy pull on the system to allow for proper ventilation, and oil can subsequently be pulled with the air.

Do a boost leak test with a local subie owner
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Old 08-07-2013, 12:30 PM   #21
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Just a suggestion for future reference. You can make a fairly affordable boost leak detector with some pvc pipe and a schrader valve. It uses compressed air in the charge pipes with the engine off to detect for any air leaks.
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Old 08-07-2013, 02:15 PM   #22
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Quote:
Originally Posted by gmorcos37 View Post
Here are some aftermarket ones that look promising. Never experienced them myself, so can't give my review.

http://www.avoturboworld.com/avoshop...hose-p-33.html
http://www.tomiokaracing.com/index.p...legacy-gt.html
ive seen these but i went with this one.

https://shop.bostonmotorsports.com/V...RX_p_1183.html

fit perfect, and i reused the oem worm clamps, held fine. ive since upgraded that POS stock IC though

Quote:
Originally Posted by rquinn19 View Post
It should also be said BE VERY CAREFUL WITH THE TURBO-> INTERCOOLER BOLTS when removing the IC
this! i ended up cross threading one of the bolts, god what a nightmare that stupid IC is..
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Old 08-07-2013, 08:12 PM   #23
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you can also check the turbo inlet. They suck even more so than the IC->tb hose just because they're not the most fun to replace. Heres mine: 2011 wrx right around 28-30k miles when I finally found this issue

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Old 08-07-2013, 09:00 PM   #24
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you can also check the turbo inlet. They suck even more so than the IC->tb hose just because they're not the most fun to replace. Heres mine: 2011 wrx right around 28-30k miles when I finally found this issue

jesus, what part of the intake/intercooler setup doesnt have to be replaced!
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Old 08-07-2013, 11:30 PM   #25
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Quote:
Originally Posted by xluben View Post
You should also add a zip to to the vacuum line that goes from the top of the BPV to the back of the intake manifold. The nipple on the intake manifold does not have a barb and can easily slide off.
+1 on this. Mine slipped off very easily when i was installing my boost gague lol.
Had to call Eric at torqued Performance to find out where the hell it went, luckily he answered the phone seeing as it was 10 at night.
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