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Old 04-07-2012, 05:40 PM   #1
soob noob
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medamullet tuned

Default boost issues

2002 wrx cobb ap tuned stage 2

It started off i was only hitting 5psi, i was missing the restrictor pill. i put one in and now I'm only hitting 10 psi.

I done the following to try and figure this out.
-swapped wastegates
-cleaned MAF
-Checked for leaks
-Loaded the stage 2 HWG (high waste gate map)
-Swapped BCS with one that I'm pretty positive is still good.

I disconnect the vacuum hose to the waste gate and i can hit 15 psi with ease..

what else could the problem be?

the car drives fine, its just pissing me off that i can't hit the target boost!
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Old 04-07-2012, 05:53 PM   #2
car_cursed
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Did you check the hoses for leaks?
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Old 04-07-2012, 06:30 PM   #3
soob noob
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yeah thats on the list haha maybe I'm missing some.
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Old 04-07-2012, 06:57 PM   #4
TurboJunkie85
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Check the vacuum hose of the ebcs off the inlet tube for any damage. Also make sure that restrictor pill is 1 inche away from the 90 degree elbow off the cold side of the turbo! Not the wastegate if that pill is near the waste gate 2/3's of your pressure is just being sent to the ebcs. If that does not work try pulling the compressor bypass valve off and pressing the piston in. If it is easy to press in that could be your problem. If none of that fixes your problem. Download a map that has a higher wastegate duty cycle map
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Old 04-07-2012, 07:24 PM   #5
soob noob
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the pill is on the cold side of the turbo.. compressor bypass valve? sorry is there another name for that I'm not sure what that is haha..


i did download/flashed a map from cobb that is for this problem. nothing happened when i loaded the map, its still hitting the same boost.
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Old 04-07-2012, 09:45 PM   #6
soob noob
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tested the BCS with a battery and its working. I'm lost! i don't hear any exhaust leaks but i need to feel around for one.

any other ideas?
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Old 04-07-2012, 10:08 PM   #7
DraconisWRX
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I have the same issue with my wagon, not sure what the issue is either.
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Old 04-07-2012, 10:08 PM   #8
907Bum
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You could just go to a blocking type soleniod, then find or get a map for that.
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Old 04-07-2012, 10:38 PM   #9
soob noob
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id like to stick to the maps from cobb, just because i don't want to pay for a new tune haha.

so when i unhooked the vac line from the waste gate and got normal boost, i assumed bad waste gate. is there something else i could gather from that?
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Old 04-07-2012, 11:07 PM   #10
bhhamblin
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Do you have the right size restrictor pill in the line? You can change boost pressure with different size pills.
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Old 04-07-2012, 11:08 PM   #11
TiM801
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My bugeye is acting ****ed up too. My boost gauge will hit 15psi than it will bounce all over to and from 15...
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Old 04-08-2012, 12:25 AM   #12
WRX N EFX
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Damn another one, I gave up on figuring out my issue. Haha
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Old 04-08-2012, 10:00 AM   #13
soob noob
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medamullet tuned

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I just assumed it was the right pill... Maybe I'll just go buy the hose kit from Subaru
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Old 04-09-2012, 11:40 AM   #14
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just buy a MBC and call it a day....
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Old 04-09-2012, 04:16 PM   #15
car_cursed
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Quote:
Originally Posted by medamullet
just buy a MBC and call it a day....
Yep, we had the same issue just did this.
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Old 04-09-2012, 04:23 PM   #16
soob noob
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Alright. I just don't want that to cause further problems later. If you guys did it and think its a good idea I'll look into it.
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Old 04-09-2012, 05:22 PM   #17
TiM801
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Mbc?..
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Old 04-09-2012, 05:30 PM   #18
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Have you recently taken off the turbo or uppipe or exhaust manifold?
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Old 04-09-2012, 05:50 PM   #19
medamullet
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Quote:
Originally Posted by TiM801 View Post
Mbc?..
manual boost controller. why you make me type it out?
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Old 04-09-2012, 06:49 PM   #20
TiM801
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Lol...
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Old 04-09-2012, 09:39 PM   #21
soob noob
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medamullet tuned

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I haven't taken anything off. I bought the car from a member with a shop and they put a new motor in it. It runs awesome I'm just not hitting target boost.

So thinking MBC?
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Old 04-09-2012, 10:18 PM   #22
907Bum
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Default

The stock unit is a bleed type and they have their pro's and cons but a big con is not being able to run more than say 12-13lbs of boost unless you re-size the pill. Jason is right either go with a blocking type Manual controller (look up the downsides) or go with an electronic controller. Either way pushing more load and more into an untuned portion of the map will lead to more risk. If your running an intake the risk increases as odds are the maf scaling will be even further off.

Suggest getting some parts and getting a roadtune. As spending the money for this will be cheaper than a new motor.
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Old 04-09-2012, 11:33 PM   #23
soob noob
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medamullet tuned

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Well if I went with the MBC I wouldn't exceed the psi that the Cobb map is tuned for. So ~14psi? Maybe 15

I don't want to go above that, because of the tune. I'd like to stick with the AP, since it's safe and I want safe instead of power.

So if I go MBC and stay within the limits of the stage 2 Cobb map..I should be safe right? Because its tuned for that psi but it's just not hitting it. At least that's my understanding, if I have that wrong correct me. I don't want to do something stupid haha.
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Old 04-10-2012, 12:05 AM   #24
axleon2
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If you do go that route let us know how it works out. Im just curious...
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Old 04-10-2012, 12:11 AM   #25
soob noob
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medamullet tuned

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Well that's the way I'm leaning now.. I just want it to be safe. I DON'T CARE ABOUT POWER. I just want to hit target boost (that may be contradicting) and I want it safe.

So the way I'm thinking it should be safe...but I could be thinking wrong. So of I'm wrong someone let me know.
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