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 Low boost blues.

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DoodieHead
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sol_boy
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Low boost blues.  Empty
PostSubject: Low boost blues.    Low boost blues.  Icon_minitimeJune 27th 2010, 3:56 am

OK on my 03 wrx i have low to no boost actually acording to franks computer its 3.5 lbs. So we all was thinking it was the up pipe since it was. i changed that and its still has the same problem. the only thing i could find is there is a ole in the induction pipe right before the turbo inlet so i have no clue if thats my problem or if its anything else so input would be helpfull thanks. on a side note i will be replacing the induction pipe so if there is anything else you can think shoot me some ideas.
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DoodieHead
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 27th 2010, 7:42 am

The are so many things that could be causing low boost, so I would recommend making sure all your vacuum lines are good and zip tied. After that check for an exhaust leak and if that still does nothing work to the turbo inlet pipe that is located under the intercooler. Those stock pipes are known to crack.

Could be the turbo also. There are so many things it could be you pretty much just need to check everything.
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sol_boy
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 27th 2010, 8:57 am

yes i checked the vac lines and the turbo has no shaft play nor the fins damaged or missing. it seems to get full spool.
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haproot
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 27th 2010, 10:16 am

Could also check the y pipe underneath the intercooler. I've seen those cracked and/or broken more than once. Also check the small piping between the intercooler and the throttle body. Make sure your ByPass/Blowoff valve isn't leaking.


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sol_boy
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 27th 2010, 5:31 pm

i checked the y-pipe there were no cracks there so im lost at this point
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DigitalSpecV03
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 27th 2010, 6:54 pm

I still say we could rig up something to see if it's that inlet pipe to the turbo. We can only make it better lol.
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sol_boy
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 28th 2010, 2:22 am

DigitalSpecV03 wrote:
I still say we could rig up something to see if it's that inlet pipe to the turbo. We can only make it better lol.
very true
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DigitalSpecV03
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 28th 2010, 3:19 am

Do it!!!! You know how to get a hold of me cheers
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sol_boy
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 29th 2010, 1:32 pm

Latest update so i bought the hks bov from frank since i needed to get rid of the crappy ebay one that has beenon there since i got the car. so i put it on well when i drive i can here it slightly but when the car it parked you rev it up and its blowing of some air im not sure if its all it should be so anyways im still chasing this ghost will post if i get anymore then 4 lbs of boost lol
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haproot
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 29th 2010, 1:51 pm

Id be curious to see what your wastegate arm/actuator looks like and the vacuum lines around the turbo and bcs.
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sol_boy
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 29th 2010, 4:05 pm

haproot wrote:
Id be curious to see what your wastegate arm/actuator looks like and the vacuum lines around the turbo and bcs.
well they all seem to be ok i did rhe old propane vaccum check but who knows the waste gate actuator is ok i know this if you want to check it out feel free to get a hold of me i am willing for any help i can get right now cause ya i am lost Question
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haproot
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 29th 2010, 4:13 pm

Where in billings do u live? West end? Heights? Etc?
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ts4l
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 29th 2010, 4:32 pm

Grab a PVC cap that matches your intercooler, drill a hole, throw a Valve stem in there and hook it to an air compressor and see if you have any boost/vacuum leaks. I have a few already made depending on what size intercooler piping you have. If its not a leak then its gotta be either the wastegate is stuck open, or a leak before the turbo. You can also use the air compressor and apply air to the wastegate line and verify it moves back and forth. Is the car poping or misfiring?
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sol_boy
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 30th 2010, 1:19 am

haproot wrote:
Where in billings do u live? West end? Heights? Etc?
the west end out twards laurel actually of duckcreek road if you know were that is?
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sol_boy
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJune 30th 2010, 1:23 am

ts4l wrote:
Grab a PVC cap that matches your intercooler, drill a hole, throw a Valve stem in there and hook it to an air compressor and see if you have any boost/vacuum leaks. I have a few already made depending on what size intercooler piping you have. If its not a leak then its gotta be either the wastegate is stuck open, or a leak before the turbo. You can also use the air compressor and apply air to the wastegate line and verify it moves back and forth. Is the car poping or misfiring?
i was talking with frank today about this actually and i have the stock piping on the car so its all the sizes of the 2.0l the car isnt missfiring or poping and there is a crack right before the inlet on the turbo so thats the next fix on my list
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PostSubject: Re: Low boost blues.    Low boost blues.  Icon_minitimeJuly 3rd 2010, 7:56 pm

+1 to TS41. It's probably a vacuum leak/air leak of some sort. Isolate portions of the system and blow air into each portion and listen for leaks. It would help to go back to stock everything, if that's possible. Check to see that someone hasn't hooked up the boost controller backwards (happened on mine, but it was an aftermarket controller that was easy to reverse the tubing). Wastegate is a long shot, but maybe.
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