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Old 01-10-2016, 01:45 AM   #1
ej20mn
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Default No sound from BOV & 25+psi on a vf48?

07 WRX with mild mods. Running VF48 with supporting mods. Car was purchased with these mods. Used to have an 02 wrx stage 2 that i mod from stock and didn't have this issue but this 07 wrx turbo set up is slightly different. Kinda new to this so a little lost. Its a daily driver - no tracks/auto cross.

Issue #1.
Put in an APS bov today and it doesn't make any sound. The adjustment on the bov has been adjusted but no change. Did some research but wasn't sure. This 07 WRX has TVG delete and running a tial EWG. Why isn't my APS bov making any sound? Could it be the TVG delete?

Issue #2.
Previous owner said it was open ecu tuned at 19psi @290whp. I saw the dyno sheet. Has Grimmspeed 3 port EBC/Hallman ProRX MBC. Even adjusting the manual boost controller all the way up or down - no change. Is boost controlled via the EWG? When I WOT my gauge shows around 25psi as max boost. On a vf48? i think that's a lot. Don't want to blow my turbo. The very first time I WOT on 4th gear hwy pull from 70mph. It passes 25psi, probably 26-27psi and hit fuel cut with a CEL - turbo range something something...Cleared it and it ran fine after that and haven't WOT since than bc i'm afraid of over boosting my vf48. I heard most people run a vf48 to about 18-19psi to be conservative. Do i need another tune to control the boost to my liking psi?
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Old 01-10-2016, 09:22 AM   #2
Scuby04STi
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What psi is the tune for? Also what does boost do when you make the shift? Did the boost #'s change with the BOV? AFR? Any new noises? Did you try just putting the old BOV back and see if things work normal again? VAC hose attached?
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Old 01-10-2016, 10:26 AM   #3
424wrx
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how about putting the stock bypass valve back on. it seems like you have a multitude of issues going on here.stop cranking up the boost controller. you are gonna blow something. you are overboosting like mad. id find a tuner asap.
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Old 01-10-2016, 11:59 AM   #4
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^^^ 18-19 psi on pump gas is not really conservative. It's high boost. Running corn you could tune for around 20-24 or so.. something is definitely wrong. Baby that thing until you get a proper tuner to evaluate what's going on.
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Old 01-10-2016, 12:00 PM   #5
ej20mn
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The tune is for 19psi according to the dyno sheet which was dated back about 3-4 yrs ago. Boost gauge looks nothing out of ordinary when shifting. It drops when i let off to shift and start boosting again going to about 25psi. NOTHING change with the new bov. It perform like i didn't even touch anything. Hose vac is on tight. 19psi is just what i was told and the dyno. First day i got it and during WOT it goes up to around 25psi. I don't know how he said 19psi when it's boosting beyond that.

Could an exhaust leak on the uppipe-to-turbo OR turbo-to-downpipe cause this? I may suspect i have a leak or is it the tial EWG? During the first few minutes of warming up the car from a cold start it sound a little like open headers or is that how the EWG sound? When engine is warmed up and at normal low idle it sounded like any wrx with exhaust system. I thought the EWG should be closed til specific pressure is reach than it opens. Also, during driving I start hearing like open header sound when my boost gauge reach -5psi. Is that suppose to happen on a EWG setup or I have an exhaust leak? The V-band clamp on the wastegate to uppipe is nice and tight.

Last edited by ej20mn; 01-10-2016 at 12:12 PM.
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Old 01-10-2016, 02:43 PM   #6
JoshFiricano
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Unless you plan to get a speed density tune for that BOV you should just put the stock BPV on. BOV's tend to make the car run bad. I've heard it 100's of times. When they put the stock BPV back on they realize how bad the car was running before.
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Old 01-10-2016, 09:00 PM   #7
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^^...agreed for the most part. I used to have a HKS bov on my 02 wrx stage two and yea it sucks but this is an APS recirculating bov. Not suppose to affect normal driving.
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Old 01-11-2016, 03:49 AM   #8
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Quote:
Originally Posted by FunkyMonkey69 View Post
^^^ 18-19 psi on pump gas is not really conservative. It's high boost. Running corn you could tune for around 20-24 or so.. something is definitely wrong. Baby that thing until you get a proper tuner to evaluate what's going on.
You don't know the parameters of the tune. 18-19 is average boost for that turbo after a tune. You don't know what the AFR is or the timing. It's not high boost at all. Plus boost doesn't matter, detonation is what matters. So you don't know what's conservative is and what's not.


Quote:
Originally Posted by ej20mn View Post

Issue #2.
Previous owner said it was open ecu tuned at 19psi @290whp. I saw the dyno sheet. Has Grimmspeed 3 port EBC/Hallman ProRX MBC. Even adjusting the manual boost controller all the way up or down - no change. Is boost controlled via the EWG? When I WOT my gauge shows around 25psi as max boost. On a vf48? i think that's a lot. Don't want to blow my turbo. The very first time I WOT on 4th gear hwy pull from 70mph. It passes 25psi, probably 26-27psi and hit fuel cut with a CEL - turbo range something something...Cleared it and it ran fine after that and haven't WOT since than bc i'm afraid of over boosting my vf48. I heard most people run a vf48 to about 18-19psi to be conservative. Do i need another tune to control the boost to my liking psi?

You have a hybrid boost control system set up. This means your EWG will not flutter or sound like "banging" when it opens. However, it sounds to me like it was either set up wrong or a vacuum line has blown off or split at the EWG. The EWG isn't open so you are over boosting to 25+psi. It's time to trouble shoot your boost control system. It is an easy fix if you educate yourself on this system. You WILL blow your motor if you keep beating on the car. Your bov/BPV has nothing to do with this issue.

Last edited by Brother EddieJ.; 01-11-2016 at 04:03 AM.
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Old 01-12-2016, 03:59 AM   #9
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^^ makes sense. Maybe what I'm hearing as "exhaust leak" around the turbo area is what causing the over boost. Maybe it's a leak that kept the EWG close thinking it's not up to pressure yet. Will bring it into a shop soon. It's currently -5F here in MN nowadays and i don't want to be in my garage.

Oh another thing I want to add is i smell exhaust gas during idle if i have my fan on so I suspect a leak around the turbo somewhere.
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Old 01-12-2016, 07:18 AM   #10
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If you are overboosting, then it has to do with your EWG and EBC/MBC set up. I also recommend you put your oem BPV back on first. Are you sure you turned your MBC all the way down first? If it is that cold, there is a chance of you overboosting a little but not that much.
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Old 01-12-2016, 01:14 PM   #11
ej20mn
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^^ yes, I've tried adjusting the MBC all the close and all the way open but no change. Yea i put the stock BPV back in. I'm very suspecting there's an exhaust leak on the up pipe causing the over boost. I believe I never heard the EWG opens. It just sounded like open headers when I start hitting -5psi so I'm assuming a leak is causing my EWG never to open resulting my turbo kept boosting?
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Old 01-12-2016, 04:20 PM   #12
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Run a line from turbo to ewg directly, it sounds like you're ewg isn't seeing boost reference pressure from the turbo
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Old 01-13-2016, 02:13 AM   #13
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I'm on the idea that your EWG isn't opening. If the boost controller isn't pulling a vacuum to it then its not going to open. Check all lines and connections. Next step is going to be checking out your EWG and make sure it is mechanically sound and functions as expected.
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Old 01-13-2016, 03:49 PM   #14
Davidbag001
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The ewg uses boost pressure NOT VACCUM to push against a spring loaded diaphragm to open once boost pressure exceeds spring pressure it opens.
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Old 01-13-2016, 04:01 PM   #15
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Quote:
Originally Posted by Davidbag001 View Post
Run a line from turbo to ewg directly, it sounds like you're ewg isn't seeing boost reference pressure from the turbo
Do this. Then find your leak.
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Old 01-13-2016, 08:37 PM   #16
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Quote:
Originally Posted by Davidbag001 View Post
The ewg uses boost pressure NOT VACCUM to push against a spring loaded diaphragm to open once boost pressure exceeds spring pressure it opens.
Wow I had that all wrong. Thanks for straightening that out.
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Old 01-14-2016, 03:11 AM   #17
ej20mn
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Will check all connections. Seems like the exhaust leak i was talking about is getting louder and louder nowadays. So i'm hoping is the Turbo gaskets. Replacing them in few days. I'm semi-convinced that its the up pipe-to-turbo gasket bc thats where the exhaust leak sound is coming from.
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Old 01-14-2016, 06:18 AM   #18
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Glad you found it. Sorry I couldn't help more and had a bad explanation for you. Glad David corrected me.
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Old 01-14-2016, 02:01 PM   #19
Davidbag001
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Exhaust leeks will not cause over boost if any thing it would cause a under boost situation. Your problem is in your ewg or tune have you tried running a line from the small nipple on your turbo( the one that now goes to your ebcs) to the lower port on the ewg?
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Old 01-14-2016, 02:06 PM   #20
Davidbag001
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Old 01-14-2016, 02:17 PM   #21
Davidbag001
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https://cobbtuning.zendesk.com/hc/en...l-System-Works

This is an excellent article and I recommend everyone reed it but what I am trying to get you to do is the Basic External Wastegate Set-up almost at the bottom of the page if that does not work remove the ewg for repair.
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Old 01-15-2016, 01:40 AM   #22
ej20mn
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Very interesting articles. Thanks. I will replace the Turbo Gaskets first and see how it perform. Will do that this weekend and update. That exhaust leak is getting very annoying. Then will look at the WG set up see how its connected.
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Old 01-22-2016, 11:56 PM   #23
Davidbag001
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Ej20nm did you find your problem?
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Old 01-23-2016, 06:12 PM   #24
ej20mn
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UPDATE: Yes and no ^
was gonna do the gaskets around the turbo today. Pop the hood, turn on the engine I notice slight smoke coming from around the turbo. Brought my shop light closer to the turbo and notice the smoke is circling the exhaust side turbine of my vf48. This is on a cold start and only for about 20-30 seconds than no more smoke. Just enough smoke like a cigarette. Weird thing is the smoke is circling the outside of the exhaust turbine. Could it be from the band that holds the turbo? Could it be cracked turbo? I guess this why I'm smelling exhaust gas inside the car most of the time. Smoke is blueish. I'm confident that my gaskets are ok. The smoke was NOT coming from downpipe gasket or the band that holds the turbo together. The smoke was littering circling the outside housing of the exhaust turbine. Could it be that factory weld line cracking? I didn't get a picture while its in action but heres a few shot afterwards. So i haven't replace any gasket today. Gonna see what you guys think about this new issue first.




OVERBOOST ISSUE: update
Yesterday the car was really acting up. Lacks power but boost still peaking around 25psi. Feels like my car was in LIMP mode. No CEL. Today I check around the boost lines and notice the hose from the turbo to the Solenoid has SNAPPED apart. Re-clamp it tightly back. Re-check all boost lines. Nice and tight. Now boost is controlled nicely now. Wouldn't boost past 21psi which is exactly what I want. The manual boost control is working properly now. I tried adjusting it and it's cooperating well. MBC adjust all the way open yields me 21psi max at WOT. Now I peak psi before 4k rpm and tappers off to 18psi around 5k rpm which I believe its suppose to be. Before, i would hit 20psi around 4k and 25psi around 5.5k rpm. Now I can WOT and it wouldn't past 21psi.

BUT NOW A NEW ISSUE - I don't get power til 2.5k rpm. The car would feel like a clogged cat til 2.5k than hits like a hammer, kinda, enough to jerk your head back and it's annoying on acceleration. Now what could cause this?

Last edited by ej20mn; 01-23-2016 at 06:18 PM.
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Old 01-23-2016, 06:22 PM   #25
ej20mn
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Here's a video of how the exhaust leak sound. Doesn't sound normal to me, i think. Sounds kinda like a tractor.
http://vid1092.photobucket.com/album...psqdwcvv5c.mp4
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