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Old 01-11-2017, 10:56 AM   #1
Chris808
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Default Boost leak?

Hey everybody, first time poster here...

Today I was on my way to work cruising about 75mph and I went to pass somebody and about a second into the gas I lost all boost. At this point my car is pushing at maximum about 1lb.

When I got to work I shut off my car to think maybe it would fix it but as I shut it off I heard a weird rattle I don't usually hear. Could a hose have come off somewhere obvious? It was pretty dark and I couldn't see a lot but I plan to go get a better look around break time.

Things to know: I live in Wisconsin and temperatures have been fluctuating from -15 to 40 degrees throughout the last couple weeks.

2005 WRX w/ Cobb Stage 1 tune and full intake. 83,000 mi.

Also there is no CEL for this on the dash or Accessport

Any help is appreciated!!
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Last edited by Chris808; 01-11-2017 at 11:13 AM.
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Old 01-11-2017, 12:16 PM   #2
Chris808
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Also, is the car safe to drive or am I damaging something? Very new to the boxer motor so this should be interesting😅
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Old 01-11-2017, 01:35 PM   #3
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That rattle noise is a concern, do you know if the car still has the up pipe catalytic converter ?
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Old 01-11-2017, 01:42 PM   #4
Chris808
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Quote:
Originally Posted by D-Rodman View Post
That rattle noise is a concern, do you know if the car still has the up pipe catalytic converter ?
Yes the exhaust is all stock. I've heard about those cats shattering. Really hope not.. I already have a cat less uppipe sitting at home but was waiting to gather the downpipe and catback.

I'll have to have someone listen for where the sound is coming from when I get home.
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Old 01-11-2017, 04:07 PM   #5
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Good luck dude, let us know the outcome.
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Old 01-11-2017, 07:06 PM   #6
Chris808
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Will keep this thread updated as I tear into it a bit tonight and see if I can find anything suspicious...

Also, if the cat did decide to lodge pieces into my turbo, does that mean the turbo is now automatically trash or is it possible to just unlodge it? I just can't see how I can build .5-1.5 lbs if something is stopping it from spooling
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Old 01-11-2017, 07:13 PM   #7
D-Rodman
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If parts from the up pipe cat go into the turbo you'll probably have to rebuild/replace it.
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Old 01-11-2017, 07:20 PM   #8
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Okay good to know, I won't get my hopes up too much. Also, I've heard changing out the uppipe is quite the b*tch.. Do you know if its easier done from above or should I wait and throw it on a lift since I have one available?
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Old 01-11-2017, 08:46 PM   #9
D-Rodman
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It's not a fun job.
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Old 01-11-2017, 09:56 PM   #10
Chris808
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Dug in there a little bit and didn't find too much helpful info.. All the hoses are good. Took the IC off and couldn't see **** from the output side of the turbo. Not enough time or energy tonight to totally rip it out and see what's going on.

Very tempted to take it in to Subaru to do a diagnostics on it and play a little dumb

Another thing, I don't hear the small rattle i heard before when shutting the car off, now it sounds normal again. Although im sure whatever debris was in there was just pushed down the downpipe is that's truely the problem.
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Old 01-12-2017, 12:49 AM   #11
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The rattling noise is what you should find out.

Do you have a boost guage?
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Old 01-12-2017, 01:26 AM   #12
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Quote:
Originally Posted by chilakas View Post
The rattling noise is what you should find out.

Do you have a boost guage?
I do on the accessport. Full throttle and I never crossed over 1.5 psi

Car runs perfectly normal, A/F ratio and all. Just no boost
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Old 01-12-2017, 05:38 AM   #13
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Playing dumb at the dealer will probably end up costing you $$$ unless you have some kind of warranty. The fact that you don't hear the rattle could also mean the broken catalytic parts lodge into the turbo.
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Old 01-12-2017, 09:36 AM   #14
Chris808
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Quote:
Originally Posted by D-Rodman View Post
Playing dumb at the dealer will probably end up costing you $$$ unless you have some kind of warranty. The fact that you don't hear the rattle could also mean the broken catalytic parts lodge into the turbo.
Makes sense, I don't hear spooling of any type so I'm sure it's either destroyed or blocked up.

If it's cheap enough, I'm gonna take it in for a diagnostics to find out exactly the problem. But I'm almost certain at this point the turbo is blown.

Where's the best place I can get a stock WRX turbo at for good price?
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Old 01-12-2017, 01:14 PM   #15
D-Rodman
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Default Boost leak?

You can buy a take off used turbo here at a reasonable price. On Ebay there is a bunch of inexpensive td04 turbos but that's probably a bad idea. Also on eBay, look at Arashi td04 turbo, probably a safer way to go but more expensive than a good used one.
You should also consider replacing the turbo inlet pipe, they get brittle as they age and eventually fail too. If you are going thru a turbo up pipe swap it is just the perfect time to do the inlet also.

Last edited by D-Rodman; 01-12-2017 at 01:19 PM.
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Old 01-12-2017, 03:09 PM   #16
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Quote:
Originally Posted by Chris808 View Post
I do on the accessport. Full throttle and I never crossed over 1.5 psi

Car runs perfectly normal, A/F ratio and all. Just no boost
ok does it show vacuum on your boost guage? A while back I had the same concern but my tuner told me that if my vacuum guage was steady at -20 at idle than I don't have a boost leak. Ended up being a coil pack.

I blew my turbo a few years ago. What happened is that I had a air filter that had a metal cap in the middle, the cap came loose and the turbo sucked it in and messed up the fins. My car made a nasty rattling noise from the metal cap hitting the fins. My car started to shoot out white smoke from the tail pipe. And it would not even run. It would stall after a minute of driving it.
So I always thought if you blow a turbo the car would not even be drivable but I could be wrong.

if you have cel that may help
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Old 01-12-2017, 05:07 PM   #17
Chris808
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Default Boost leak?

Quote:
Originally Posted by chilakas View Post
ok does it show vacuum on your boost guage? A while back I had the same concern but my tuner told me that if my vacuum guage was steady at -20 at idle than I don't have a boost leak. Ended up being a coil pack.



I blew my turbo a few years ago. What happened is that I had a air filter that had a metal cap in the middle, the cap came loose and the turbo sucked it in and messed up the fins. My car made a nasty rattling noise from the metal cap hitting the fins. My car started to shoot out white smoke from the tail pipe. And it would not even run. It would stall after a minute of driving it.

So I always thought if you blow a turbo the car would not even be drivable but I could be wrong.



if you have cel that may help

Here's my idle, car wasn't completely warmed up but i've never seen -20 psi ever so far. This is the same vacuum it had when the car was working properly. It will reach .5 psi super quick but it won't go anywhere between .5 and 1.5.

Also, no CEL so far.

Ignore me in the reflection on the picture

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Old 01-12-2017, 07:23 PM   #18
Chris808
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Also, whats your guys opinion on this turbocharger?

http://www.autopartswarehouse.com/sk...dfcaAr9w8P8HAQ
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Old 01-12-2017, 09:04 PM   #19
chilakas
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Quote:
Originally Posted by Chris808 View Post
Also, whats your guys opinion on this turbocharger?

http://www.autopartswarehouse.com/sk...dfcaAr9w8P8HAQ
Oh ok well your accesport is reading psi so and mine is in hg which would be around 9.5 to 9.8, so than I think your not that far off. So I don't think you have a boost leak. I think you need to take off the turbo inlet pipe and try to see what's going on in there. With a mirror and a flashlight.

if everything thing looks normal I would find a buddy with the same car and start swapping parts maybe the boost controller solenoid?
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Old 01-17-2017, 07:00 PM   #20
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-9.44 PSI is -19.22 in-hg (inches of mercury), so your vacuum is good.

A quick test would be to bypass the boost solenoid with a straight vac line from the turbo outlet to the wastegate; it'll run only wastgate boost (7-9PSI) at most, but might prove helpful. else, time to boost leak the intake tract.
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Old 01-17-2017, 09:16 PM   #21
epeder1102
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Default Boost leak?

With regard to your uppipe install question, I just did it last week. It wasn't hard but took me a day and a half with only jack stands and without touching the motor mounts. I have had very limited experience before that. I'd say it's doable and very much worth it if you do find out your turbo isn't already trash. Good luck!

Might I add, I did it in our cold Wisconsin weather and I would highly advise against that
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