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Old 04-17-2013, 09:59 PM   #1
drewvdw
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I've developed an issue with my EWG causing it not to open, originally, I thought it was my MAP sensor because when I checked my boost level from my AP, it read 6psi at idle. Took it off and bench tested the sensor and found it to be faulty and replaced it today, however when I went to take it for a test drive, it didn't help at all. I've still got the same problem of the waste gate not opening. Now I'm thinking that its either my 4 port EBCS or the wastegate itself. I'm certain the spring isn't the issue as its the same spring I was using before when it was working fine. If it matters, when it first started happening, it would only do it when it was really cold, but once my car warmed up it worked fine.

Edit: mods:
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Last edited by drewvdw; 04-17-2013 at 10:13 PM.
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Old 04-18-2013, 01:11 AM   #2
xluben
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Run a vacuum line straight from the compressor to the EWG. That will take the EBCS out of the system. It should open at whatever your spring pressure is. If it doesn't open, then it's a wastegate issue. If it opens fine, then it's probably an EBCS issue (but it could also be a vacuum line is loose/popped off/leaking or even a tune issue).
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Old 04-18-2013, 01:42 AM   #3
drewvdw
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I can't as I'm running a 15 psi spring or something like that and I'm still running my break in tune at 5psi. Before you say that's not possible, my EBCS is a 4 port.
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Old 04-18-2013, 05:31 AM   #4
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Does it flutter? Or it won't open @ all? There also could be a code issue, use the port under the steering wheel that would give you Assn idea as well
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Old 04-18-2013, 07:28 AM   #5
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Well then, under those conditions your wastegate is working correctly by not opening. A wastegate with a 15psi spring will never open until boost pressure reaches at least 15psi. The purpose of the EBCS is to reduce the pressure to the wastegate actuator and delay opening.

Edit: You say use of a 4 port EBCS exempts you from the wastegate/boost pressure mismatch. Maybe you could share a link explaining this since I can't find any documentation supporting that on the net.
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Old 04-18-2013, 08:44 AM   #6
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I don't completely understand it, but I do know it was working before. My tuner recommended the 4 port to me and he has put the break in tune on without any problem.

Under most driving conditions, it won't open at all, however, at interstate speeds I can get it to flutter around 1psi. I know the spring should be changed, but I don't want to go through the hassle if I don't need to.
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Old 04-18-2013, 09:46 AM   #7
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You guys have it ass backwards. If his tune is for 5 psi then that wastegate should be open anytime the engine is under load. You know, so that it can keep a low level of boost?

Just do the first test suggested and connect the turbo compressor to the wastegate. It is a first step in a systematic troubleshooting effort. Otherwise you are just going to spend money chasing your tail.

PS: I took my new engine out and hit 1 bar after my first startup/idle oil change. It wont kill it...unless it was built wrong.
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Old 04-18-2013, 10:18 AM   #8
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A wastegate with a 15psi spring will never run under 15psi... EVER.. You can't run under spring pressure you can only go up from there.
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Old 04-18-2013, 10:22 AM   #9
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Quote:
Originally Posted by woodys77 View Post
A wastegate with a 15psi spring will never run under 15psi... EVER.. You can't run under spring pressure you can only go up from there.
this..
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Old 04-18-2013, 10:31 AM   #10
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If you use the additional ports on the wastegate, such as with a 4 PORT BCS, you can apply pressure to either side of the spring. That is why it has top and bottom ports.

I assume the OP is rolling into the throttle, and once he hits 1 psi with no wastegate, he lets off. If his "tune" is for 5 psi the wastegate may not have had a chance to open.

But that is just speculation because there is not enough info. A log would be beneficial. As would further troubleshooting...
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Old 04-18-2013, 11:19 AM   #11
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Quote:
Originally Posted by aboothman View Post
If you use the additional ports on the wastegate, such as with a 4 PORT BCS, you can apply pressure to either side of the spring. That is why it has top and bottom ports.

I assume the OP is rolling into the throttle, and once he hits 1 psi with no wastegate, he lets off. If his "tune" is for 5 psi the wastegate may not have had a chance to open.

But that is just speculation because there is not enough info. A log would be beneficial. As would further troubleshooting...
That's correct, this is my daily, so I don't get into it too often. The wastegate used to open at partial throttle at minimal boost, so I don't understand the statement about it not having a chance to open. I've been driving it very carefully and avoiding going into boost.

What do you need in a log and what troubleshooting?
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Old 04-18-2013, 11:31 AM   #12
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This still doesn't change the fact that there is no way you are going to get an EWG with a 15psi spring to open at 5psi.

At the end of the day, the gate won't open until you supply 15psi into the diaphragm. Unless you've got an air pump somewhere supplying 20psi that we dont know about, your not going to have a 15+psi air source anywhere else.
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Old 04-18-2013, 11:43 AM   #13
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Or vacuum supplied to the other side of the diaphragm to assist the spring.
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Old 04-18-2013, 01:31 PM   #14
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Quote:
Originally Posted by drewvdw View Post
Or vacuum supplied to the other side of the diaphragm to assist the spring.
Where are you going to get that vacuum? The only source of high vacuum in the car is the intake manifold when you're off the throttle, but you're not going to be off the throttle when this is all occurring. In fact the manifold is going to be at roughly the same positive pressure as the turbo outlet, which means it's going to be fighting the boost that's trying to open the valve and will, in fact, help to keep it closed.
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Old 04-18-2013, 02:04 PM   #15
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While a 3 port limits max boost to roughly 2 times spring pressure, a 4 port can run 4 or more times spring pressure. It cannot limit your boost to less than spring pressure....unless you installed a vacuum pump.

Running a 4 port with a 15psi spring is pointless unless you plan on running 30+psi and even then you could do that with a 6psi spring.

Put a 5psi spring in if you want to run as low as 5psi.

Last edited by vica153; 04-18-2013 at 02:45 PM.
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Old 04-18-2013, 02:07 PM   #16
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Then why was it working fine before? That's the part that makes no sense. I was able to run a 5 psi tune on this setup, but it just quit all of the sudden. I didn't change my setup at all.

The problem was that I wasn't there to finish my car and the 15 psi spring was left in.
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Old 04-18-2013, 02:13 PM   #17
RemlapaN
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Reading between the lines here...

I'm guessing OP is using the MAF housing as the vacuum source, and wondering why it's not working consistently or reliably.


I would be *shocked* (or maybe not so in this case) if your air intake is so damn restrictive that it's pulling 775 mmHg while your turbo is only generating 5psi of positive boost.


More importantly: Why are you so damn afraid of breaking your car in at 15psi? We all do it. I'm not even sure you're gonna get a really good ring seat at only 5psi.
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Old 04-18-2013, 02:19 PM   #18
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If you were running 5psi, then you have 5psi spring...or a bunch of problems that miraculously limited boost to 5psi.

If the tune didnt change, then did a hose come off....wire to solenoid melt?
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Old 04-18-2013, 02:35 PM   #19
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Quote:
Originally Posted by drewvdw
Then why was it working fine before? That's the part that makes no sense. I was able to run a 5 psi tune on this setup, but it just quit all of the sudden. I didn't change my setup at all.

The problem was that I wasn't there to finish my car and the 15 psi spring was left in.
You should go to your car, run the line from compressor housing to your wastegate. Then come back and tell us what you found. We're trying to help you troubleshoot. If you don't know how things work, read up some more.
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Old 04-18-2013, 02:54 PM   #20
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Quote:
Originally Posted by vica153 View Post
While a 3 port limits max boost to roughly 2 times spring pressure, a 4 port can run 4 or more times spring pressure.
Quoted for posterity, learn something new every day.
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Old 04-18-2013, 03:03 PM   #21
drewvdw
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Quote:
Originally Posted by FuJi K View Post

You should go to your car, run the line from compressor housing to your wastegate. Then come back and tell us what you found. We're trying to help you troubleshoot. If you don't know how things work, read up some more.
I can already tell you what I'll find. Fuel cut.

I'll probably be swapping out springs since I've been meaning to anyways.
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Old 04-18-2013, 03:10 PM   #22
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I just had to replace the diaphragm on my Tial 38mm MVS wastegate. They tend to tear after a while. I was having overboosting issued even running straight from the wastegate to the compressor nipple. In my case, I'm sprung for 18.85psi and was hitting 24 psi.

OP, I have an Ingersoll Rand 4 Port EBCS that I can sell you for $75 shipped priority
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Old 04-18-2013, 09:24 PM   #23
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I think the answer here has already been stated multiple times. You have a 15psi spring and you're trying to run 5psi. This cannot be reliably done, even with a 4 port EBCS.
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Old 04-18-2013, 09:30 PM   #24
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Quote:
Originally Posted by xluben View Post
I think the answer here has already been stated multiple times. You have a 15psi spring and you're trying to run 5psi. This cannot be reliably done, even with a 4 port EBCS.
Lmfao
+1
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Old 04-18-2013, 09:45 PM   #25
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why not just take the wastegate off and change the springs if you're dead set on wanting less boost for break in?

obviously a pain, but it'll be solid- then you can bypass the ebcs and just run spring pressure reliably until break-in is finished.
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