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Old 04-20-2013, 11:18 PM   #1
Buzzed Trucks
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Default URGENT: EWG Issues

Hey guys, got a few questions about my Tial MV-S 38mm V-Band External Wastegate that I just installed. I have the 15.95psi spring combo setup in it (initially had the 10psi spring combo, but changed it to see if it would fix my issue). I did have my Hallman Manual Boost Controller setup, but I removed that and ran my vacuum line directly to the wastegate. So here is my issue. My EWG is opening around 5-10psi, BUT I am hitting over 15.95 psi. I let off around 19-20 psi.

So here is my setup. From the nipple on the compressor, I ran straight to one of the bottom 3 air ports on the wastegate. The other 2 bottom ports are closed, while the top two air ports are open. The h20 ports are open as well. Now since I removed my stock electronic boost controller solenoid, which T'd off from the compressor and also connected to my turbo inlet tube, I got rid of the T and ran straight from the compressor to the EWG. I also plugged the port on the turbo inlet tube (this may be my issue, but I wouldn't think so).

Now I did have grind the top of my wastegate to have clearance around my downpipe. This put a really small hole on the top of the wastegate, but shouldn't be an issue since the top two air ports are already open.

So I am completely lost right now. The EWG is opening early, but yet I'm overboosting. The only parts I have touched on the EWG are the 6 little bolts holding down the cap when I swapped out the springs.

EDIT: I did have the Hallman Manual Boost Controller hooked up on the new spring combo, but had it all the way backed out and was still couldn't get it any lower than 21-22psi (I left off at 21-22psi).

My current setup:
Invidia Catless DP
CNT Catback
Killer B Headers/Up-pipe
Perrin TMIC
AEM CAI
GFB BOV
1000cc DW Injectors
Obviously Tial 38mm MV-S EWG

Any help would be greatly appreciated, thanks guys!
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Last edited by Buzzed Trucks; 04-20-2013 at 11:44 PM. Reason: Added more info
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Old 04-21-2013, 06:32 AM   #2
Kinjirra
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Have you talked to your Tuner? Or did you tune it yourself?

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Old 04-21-2013, 08:34 AM   #3
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Have you talked to your Tuner? Or did you tune it yourself?

My buddy tunes it/I'm learning to tune it myself. We're both just so dumbfounded. I'm guessing something is wrong with the wastegate, because I'm pretty damn sure I have my vacuum/boost lines hooked up already. I mean, it's pretty hard to mess up boost lines... it's only from turbo compressor to wastegate.
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Old 04-21-2013, 09:37 AM   #4
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Pic of where you ground the gate? Definitely sounds like you ****ed up the wastegate either grinding it or putting it together. Do you have a handheld vac/pressure pump that you can test the gate with it off so you can see if its opening? What size gate and turbo and have you ever used it and had it working properly?
It's not hard to damage the diaphragm putting it together. One little tear and your done
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Old 04-21-2013, 09:48 AM   #5
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Pic of where you ground the gate? Definitely sounds like you ****ed up the wastegate either grinding it or putting it together. Do you have a handheld vac/pressure pump that you can test the gate with it off so you can see if its opening? What size gate and turbo and have you ever used it and had it working properly?
It's not hard to damage the diaphragm putting it together. One little tear and your done
I don't have access to a pump at the moment, but its definitely opening. Its opening at 5-10psi. Its brand new, just put it on my 2012 wrx with stock turbo.

This is the best picture I have at the moment. I only ground down the top step of the wastegate.

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Old 04-21-2013, 10:27 AM   #6
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And you have a vac hose run straight from the compressor housing to the bottom wastegate port? Make sure it hasn't melted and make sure its not one of the tiny stock lines with the restrictor pill. It's not good having the wastegate pointed right into that heatsheild and no dump tube its gonna put a lot of extra exhaust fumes into your engine bay and interior but I don't think it should cause overboosting unless the outlet is blocked pretty solidly
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Old 04-21-2013, 10:57 AM   #7
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And you have a vac hose run straight from the compressor housing to the bottom wastegate port? Make sure it hasn't melted and make sure its not one of the tiny stock lines with the restrictor pill. It's not good having the wastegate pointed right into that heatsheild and no dump tube its gonna put a lot of extra exhaust fumes into your engine bay and interior but I don't think it should cause overboosting unless the outlet is blocked pretty solidly
I have a dump tube on, just didn't have it on when I took the picture. I used the vacuum line that came with my Hallman MBC.
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Old 04-21-2013, 11:02 AM   #8
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The weird thing is that it still seems to be spooling fine. Almost like the wastegate is opening like 10 percent in low boost then just staying at 10 percent until I let off (20+ psi).
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Old 04-21-2013, 11:18 AM   #9
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Well like a said. Double check your vac line. Double check the plugs haven't come out. It sounds like a leaking vac line. Maybe check at autozone see if they loan out a hand vac pump. Or buy one they're pretty cheap and handy to have
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Old 04-21-2013, 11:39 AM   #10
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Well like a said. Double check your vac line. Double check the plugs haven't come out. It sounds like a leaking vac line. Maybe check at autozone see if they loan out a hand vac pump. Or buy one they're pretty cheap and handy to have
I'm 99 percent sure all my lines are correct, but I will check again. The only thing is that a vacuum leak won't explain the wastegate opening at 5-10psi.
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Old 04-21-2013, 08:18 PM   #11
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To run wg spring pressure you have it set right. Make sure there aren't any holes in your vacuum hose. And make sure the two bottom plugs are installed and not leaking air. You need to make sure the valve can fully cycle with it out of the car. If the valve fully cycles then something else is wrong, you shouldn't be over boosting.
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Old 04-21-2013, 09:48 PM   #12
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Also are you positive you have the right combination of springs? Maybe they sent you the wrong ones? Also there's a old and new set of colors here's a link with a chart

http://www.verociousmotorsports.com/...ings-MV-S-MV-R
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Old 04-21-2013, 10:26 PM   #13
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Originally Posted by dstroy View Post
To run wg spring pressure you have it set right. Make sure there aren't any holes in your vacuum hose. And make sure the two bottom plugs are installed and not leaking air. You need to make sure the valve can fully cycle with it out of the car. If the valve fully cycles then something else is wrong, you shouldn't be over boosting.
Vacuum hose is brand new, and the two plugs are tight. I will be taking the wastegate off and checking with a pump to see if it cycles.

Quote:
Originally Posted by cowboy_Rob View Post
Also are you positive you have the right combination of springs? Maybe they sent you the wrong ones? Also there's a old and new set of colors here's a link with a chart

http://www.verociousmotorsports.com/...ings-MV-S-MV-R
I have the blue and yellow springs (new springs) installed. I actually used that site to choose the spring combo.
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Old 04-22-2013, 08:45 AM   #14
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Do you have the restriction pill in the line?
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Old 04-22-2013, 10:55 AM   #15
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Do you have the restriction pill in the line?
Nope, just running the vacuum line that came with Hallman MBC straight from the nipple on the compressor to the wastegate.

I just tried calling Tial and spoke to some lady. She said there wasn't anyone available to give me tech support. So I will give them a call back in a few hours.

Good news is that it's pretty fun that the EWG opens at 5-10psi. I can drive downtown and campus making loud, obnoxious, and annoying noises. But the fun will only last so long until I get annoyed haha. I'd much rather fix this issue anyways.
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Old 04-22-2013, 10:53 PM   #16
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So I talked to Tial today and they told me to check the diaphragm for any damages or pinches. I took it off, checked it and everything seemed ok. When I put the wastegate back together, I made sure the seal wasn't pinched anywhere. I used my air compressor to blow into the wastegate (basically creating boost) and the wastegate opened the whole way (at least I think so because the very top whole was shut because the piston was all the way at the top). Took it out for a drive and everything was still the same, opening early and still overboosting.

So then I thought, what the hell, I'll try running the vacuum line somewhere else. I ran it to the vacuum line that my bov is connected to. Good news is that the car wouldn't go over 20 psi, when before is was going 21+ psi. Bad news is that it's still opening early (5-10 psi) and it's supposed to be holding at 16 psi, not 20.

Is the Tial 38mm MV-S not flowing enough air for me? Is that why I'm overboosting? I would think it'd be plenty sufficient since I'm still on stock turbo with Killer B headers, catless DP and cat-back. Even if it doesn't flow enough air, it still doesn't explain it opening early.
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Old 04-22-2013, 10:56 PM   #17
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No way it's not flowing enough air have you check all the other vacuum lines could be a leak somewhere else
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Old 04-22-2013, 11:11 PM   #18
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No way it's not flowing enough air have you check all the other vacuum lines could be a leak somewhere else
There is absolutely no vacuum leak causing the wastegate to open early and overboost. The single line going to the wastegate is brand new. If there are any vacuum leaks in any other locations, it wouldn't make the car overboost, it would make it underboost.
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Old 04-23-2013, 01:21 AM   #19
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Ditch the mbc and get the GrimmSpeed 3-port ebcs. I was running a mbc when I first installed my ewg and I had overboost issues. I ordered the 3-port and it took care of those problems right away... it was annoying as hell hearing the boost fluctuation at WOT, but the overboost was gone.

Then I took the mbc and used it in line with the ebcs. Now the mbc just takes over at 19 lbs. and I've had zero issues, so that's where I'd start.
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Old 04-23-2013, 11:56 AM   #20
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Ditch the mbc and get the GrimmSpeed 3-port ebcs. I was running a mbc when I first installed my ewg and I had overboost issues. I ordered the 3-port and it took care of those problems right away... it was annoying as hell hearing the boost fluctuation at WOT, but the overboost was gone.

Then I took the mbc and used it in line with the ebcs. Now the mbc just takes over at 19 lbs. and I've had zero issues, so that's where I'd start.
I'm not currently runnimg the MBC. I'm hooked up directly to the wastegate.
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Old 04-23-2013, 01:26 PM   #21
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I've found a few people saying in forums to run the vacuum line to a pre throttle source. I've also found people saying that they were getting weird results when running their EWG straight off the compressor nipple. So where could I find a pre throttle vacuum source?
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Old 04-23-2013, 01:45 PM   #22
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Can you show us how the WG is attached to the up pipe? Possible bad MBC? try running WG spring pressure only (no boost controller) and see how it acts.

Mike
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Old 04-23-2013, 01:56 PM   #23
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Can you show us how the WG is attached to the up pipe? Possible bad MBC? try running WG spring pressure only (no boost controller) and see how it acts.

Mike
I am not currently running a MBC. I have the vacuum line running directly to the wastegate.

I do not have a pic of my uppipe, but here is a picture I found online of what it does look like.

http://photos.killerbmotorsport.com/...size=1600x1200

Now I thought, since I'm running only on the wastegate spring and since it's all mechanical and nothing electrical (no more EBCS), I don't need a new tune. Is that true? If it does need retuned, what do I need to change? I did go into Accesstuner and change my WGDC tables to 0, but that didn't seem to affect anything.
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Old 04-23-2013, 02:05 PM   #24
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I feel your pain. I am having the exact issue as you. I was sprung for 18 psi and running 24psi running straight from my compressor nipple to the side port. Took it apart, replaced my diaphragm because I had a bit of wear and same crap after reassemply and reinstallation. I repsrung it for 15.95 psi with the new version springs and I now hit 21psi.

I tried the stock BCS, GS 3-port, GM BCS, and even a manual boost controller and it just goes way past 25psi.I even tested my BCS harness to make sure I had power and its good. The only "control" I have is to continue running staright from the side port to the compressor nipple and it still overboosts by 5 psi.
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Old 04-23-2013, 02:51 PM   #25
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Originally Posted by Rodwrx23 View Post
I feel your pain. I am having the exact issue as you. I was sprung for 18 psi and running 24psi running straight from my compressor nipple to the side port. Took it apart, replaced my diaphragm because I had a bit of wear and same crap after reassemply and reinstallation. I repsrung it for 15.95 psi with the new version springs and I now hit 21psi.

I tried the stock BCS, GS 3-port, GM BCS, and even a manual boost controller and it just goes way past 25psi.I even tested my BCS harness to make sure I had power and its good. The only "control" I have is to continue running staright from the side port to the compressor nipple and it still overboosts by 5 psi.
Are you still on stock turbo as well? Only other thing I can think of (as long as EWG is not defective) that the dump tube is too restricting. But that even sounds ridiculous.
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