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11-03-2012, 03:23 PM | #1 |
Scooby Newbie
Member#: 249219
Join Date: Jun 2010
Chapter/Region:
SCIC
Location: San Diego, CA
Vehicle:2007 WRX TR World Rally Blue |
07 WRX TR Boost issue only 6 psi?
Hello, I purchased an 07 wrx from the dealership and it has been pushing only 6 psi boost. I am no mechanic but I do have mechanical skills being in the navy. The car is pretty much stock except for the 5" exhaust. Ive been reading posts on here for over an hour now. I have checked most of the vacuum lines, well the ones I can see on the turbo, MBC, inter-cooler and stock BOV. They are nice and tight. I have reset my ECU and still only 6psi. I'm thinking either my boost gauge is degraded or installed in the incorrect spot. Im not sure if I am getting waste gate only. I have taken some pictures. Also does anyone know where I can find a vacuum diagram? Maybe that will help. Thanks! Let me know if I should post some more pics?
^^^^^This one shows where the boost gauge was tapped^^^^^
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11-03-2012, 05:04 PM | #2 |
Scooby Specialist
Member#: 181298
Join Date: May 2008
Chapter/Region:
MAIC
Location: MAIC
Vehicle:2019 KUV 21 Crystal White |
If u adjust boost with mbc does the boost go up or down???
Is it tuned? |
11-03-2012, 05:07 PM | #3 |
Scooby Newbie
Member#: 249219
Join Date: Jun 2010
Chapter/Region:
SCIC
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Vehicle:2007 WRX TR World Rally Blue |
No MBC only stock boost controller.
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11-03-2012, 05:07 PM | #4 |
Scooby Newbie
Member#: 249219
Join Date: Jun 2010
Chapter/Region:
SCIC
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Vehicle:2007 WRX TR World Rally Blue |
And I've never had a tune.
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11-03-2012, 05:10 PM | #5 |
Scooby Newbie
Member#: 249219
Join Date: Jun 2010
Chapter/Region:
SCIC
Location: San Diego, CA
Vehicle:2007 WRX TR World Rally Blue |
Sorry I had an MBC on my old subie. Not this one
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11-03-2012, 05:41 PM | #6 | |
Scooby Specialist
Member#: 181298
Join Date: May 2008
Chapter/Region:
MAIC
Location: MAIC
Vehicle:2019 KUV 21 Crystal White |
Quote:
Do a smoke test to make sure u don't have a leak. |
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11-03-2012, 05:45 PM | #7 |
Scooby Newbie
Member#: 249219
Join Date: Jun 2010
Chapter/Region:
SCIC
Location: San Diego, CA
Vehicle:2007 WRX TR World Rally Blue |
My bad I didnt mean to put MBC I meant stock boost controller.
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11-03-2012, 05:52 PM | #8 |
Scooby Specialist
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Join Date: May 2008
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Bcs may be bad.
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11-03-2012, 09:44 PM | #9 |
Scooby Newbie
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Join Date: Jun 2010
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Vehicle:2007 WRX TR World Rally Blue |
I cleaned the BCS and MAF sensor with maf sensor cleaner in accordance with this http://www.scoobypedia.co.uk/index.p...ontrolSolenoid
And still only 5-6 psi. Im going to try a leak test as soon as I can get the required equipment. Maybe get a new BCS or EBC Also I am going to get a new boost gauge and vac lines. If any one can think of anything else I can try please let me know. Thanks for all the input so far... |
11-03-2012, 09:52 PM | #10 |
Scooby Specialist
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Ebcs, new vac lines without the pill and a tune or tweak and problem should be solved
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11-03-2012, 10:52 PM | #11 |
Scooby Specialist
Member#: 330625
Join Date: Aug 2012
Chapter/Region:
NESIC
Location: MA
Vehicle:2006 WRX WRB |
You are on WG spring pressure something is throwing the car into no boost mode because the ecu is not commanding a higher pressure. I bet its not tuned for that intake, running lean, knocking and the iam is at 0. To test this, disconnect the battery and press the brake pedal, then reconnect the battery. If you make more boost than 7psi on the first WOT run, stay out of boost on your way home and DO NOT drive the car again until you either get a tune or get a stock intake back on it.
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11-04-2012, 04:47 PM | #12 | |
Scooby Newbie
Member#: 249219
Join Date: Jun 2010
Chapter/Region:
SCIC
Location: San Diego, CA
Vehicle:2007 WRX TR World Rally Blue |
Quote:
I have already rest the ECU by disconnecting the battery and it made no difference. This is the way the car came from the dealership. This is my daily driver that I have been driving in this condition for the past 6 months. I had to get the carb sticker from the dealership so I could pass Cali emissions. The car runs great and is fast. Im thinking where they tapped the boost gauge was in an incorrect location. It is tapped off of the BOV. Would that make a difference in the reading? And I do realize I spelled gauge wrong on the pic just too lazy to change it. |
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11-04-2012, 05:06 PM | #13 |
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What kind of boost gauge do you have and when you let off the gas what vacuum does it go to?
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11-04-2012, 09:00 PM | #14 |
Scooby Newbie
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11-04-2012, 09:38 PM | #15 |
Scooby Specialist
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Vehicle:2006 WRX WRB |
Thats a fine spot to pull the boost gauge from. For some reason the car is on waste gate pressure. You need to figure out why.
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11-04-2012, 09:48 PM | #16 |
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maybe i just need a basic tune? I know Cobb will charge $500...
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11-04-2012, 09:53 PM | #17 |
Scooby Newbie
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The wife just informed me the dealership said the previous owner blew the original engine and they installed a new engine about 1000 miles before I bought it...
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11-04-2012, 09:59 PM | #18 |
Scooby Newbie
Member#: 169539
Join Date: Jan 2008
Chapter/Region:
Tri-State
Location: Buffalo, NY
Vehicle:2004 WRX sedan JBP 2013 BRZ GBS, 2000 2.5RS |
I had a problem running at wastegate spring pressure after I swapped turbos (going from VF39 back to stock TD04). The newer turbo had the vacuum lines already on it, so I used those. Turns out, those lines were missing the restrictor pill. I fished the pill out of the old lines, inserted in the correct vacuum line, and voila, hitting correct boost again.
If you haven't already, make sure that you have the restrictor pill in there, and in the correct line. If it's not in there, you could easily have this exact problem. If the 06 is the same as my 04 as far as restrictor pills goes, this might fix your problem. If I goofed that up, my apologies. Use this diagram for reference (where the pill goes): |
11-04-2012, 10:02 PM | #19 | |
Scooby Newbie
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SCIC
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Quote:
Can you see or feel the pill inside the vac line? like a bulge or something? Cause I was feeling and looking to see if I could tell which line it was in and I could not tell. |
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11-04-2012, 10:09 PM | #20 |
Scooby Newbie
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Location: Buffalo, NY
Vehicle:2004 WRX sedan JBP 2013 BRZ GBS, 2000 2.5RS |
You should be able to feel a little hard ball in there yes (that's what she said), but you might not be able to see it. It doesn't matter where in that one vacuum line it is, as long as it's in the right line. The vacuum lines might be fairly stiff, but if you squeeze it hard with your fingers along the few inches of its length, you should be able to feel something. Worst case scenario, you could carefully slide off the little metal clips, pull the line off of the nipples, and poke something through it, like a piece of wire, to see if there is actually a pill inside, or if it's missing.
Last edited by lastsnare; 11-04-2012 at 10:35 PM. |
11-04-2012, 10:47 PM | #21 |
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BCS may be bad. Look on here how to test it with a battery. No CELs?
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11-04-2012, 10:53 PM | #22 |
Scooby Specialist
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Join Date: Aug 2012
Chapter/Region:
NESIC
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Vehicle:2006 WRX WRB |
Yeah a bad bcs would though a cel, a un pluged bcs would throw a cell. Having the wastegate plumbed directly to the intake with no bcs in there might throw one for failing to reach the boost target. Having an IAM of 0 due to a lot of knock would make it target wg pressure but would reset the iam to 8 after pulling the battery irrc.
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11-04-2012, 11:19 PM | #23 |
Scooby Newbie
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11-05-2012, 05:22 AM | #24 |
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MWSOC
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Vehicle:06 WRX CGM |
What's up with the 5" exhaust? Does the car have a stock down pipe? What about the butt dyno? Does it feel like it pulls hard or is it a wet noodle?
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11-05-2012, 06:58 AM | #25 | ||
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Quote:
Quote:
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