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Old 08-05-2014, 10:06 PM   #1
VenomWRX
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Default big boost leak issue

So to start I will tell you about the car. 2003 wrx wagon, cat less turbo back and cat less up pipe, short ram intake, turbo inlet tube. OK so I picked up the car in December and everything ran good other than the turbo screaming loud because it was ran dry by the previous own and burnt the bearings, still pulled good boost. I picked up a used turbo that I was told had low mileage and seemed to have zero shafts play. I swapped the turbo and now can't go above 10 psi. Forgot to mention I have a stage 2 flash and should be running 17 psi. I built a boost leak tester and tried to test for a boost leak but can't get it to build up pressure. I found all the air is dumping out my exhaust. I pulled the exhaust off and the air seems to be coming from my turbine. I have done boost leak tests before on my other wrx and never had this happen. Would the problem be the turbo is leaking from the cold to hot side or would it be passing through in my motor somewhere? Any help would be great.
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Old 08-05-2014, 10:15 PM   #2
Jubert69
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There's a huge issue other than just boost. You must not be doing the boost test correctly if you can't get it to build up pressure.
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Old 08-05-2014, 10:35 PM   #3
VenomWRX
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I'm sure I'm doing it right, like I said I have done it before on my last wrx. Tester is in the turbo inlet tube and like I said I can feel the air dumping out of the turbine on the hot side of the turbo
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Old 08-05-2014, 10:42 PM   #4
jthatch12
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Turbos have something called a wastegate and guess where that dumps? The exhaust. My guess is the diaphragm in the waste gate is shot so you're running spring pressure.

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Old 08-05-2014, 10:57 PM   #5
VenomWRX
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Nope, that's the first thing I tried and changed the actuator. I'll say it again, the air is coming from the turbine. The waste gate flap is not passing air.
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Old 08-05-2014, 11:04 PM   #6
jthatch12
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Quote:
Originally Posted by VenomWRX View Post
Nope, that's the first thing I tried and changed the actuator. I'll say it again, the air is coming from the turbine. The waste gate flap is not passing air.

You do realize exhaust air still exits through the turbine correct? The turbine is spun by exhaust gases then exits down the downpipe. The waste gate bypasses the turbine.

In other words, for you to say air is coming from the turbine is like saying your car has an engine. No ****!

Long story short I bet your EBCS crapped out.

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Last edited by jthatch12; 08-05-2014 at 11:11 PM.
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Old 08-05-2014, 11:09 PM   #7
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Old 08-05-2014, 11:15 PM   #8
VenomWRX
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Thanks tips. I know how a turbo works. Now tell me why it's not holding pressure when I pump up the cold side and is just dumping out the hot.
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Old 08-05-2014, 11:18 PM   #9
Jubert69
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What is going on.

There are two pressurized sides. Exhaust system and intake system. When you do a BOOST leak test, it should NEVER exit outside ANY part of the exhaust side.
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Old 08-05-2014, 11:18 PM   #10
dangerousatom
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Quote:
Originally Posted by jthatch12 View Post
You do realize exhaust air still exits through the turbine correct? The turbine is spun by exhaust gases then exits down the downpipe. The waste gate bypasses the turbine.

In other words, for you to say air is coming from the turbine is like saying your car has an engine. No ****!

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We'll if it's actually coming out the exhaust side of the turbo, and your doing the boost test correctly then your valves are bent.

There is a slight chance your car is falling to a open valve spot at shut down, but I can't believe it's consistently doing it . . . Try turning the motor over by hand while pressurizing till the valves you should get pressure somewhere in a 1/4 turn of the crank.

If it still leaks the way your describing, your either mistaken or you need to check your compression.
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Old 08-05-2014, 11:20 PM   #11
Jubert69
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Quote:
Originally Posted by VenomWRX View Post
Nope, that's the first thing I tried and changed the actuator. I'll say it again, the air is coming from the turbine. The waste gate flap is not passing air.
How do you know the air is coming from the turbine? Without the turbo inlet or downpipe off, I don't know how you can tell.

Quote:
Originally Posted by jthatch12 View Post
You do realize exhaust air still exits through the turbine correct? The turbine is spun by exhaust gases then exits down the downpipe. The waste gate bypasses the turbine.

In other words, for you to say air is coming from the turbine is like saying your car has an engine. No ****!

Long story short I bet your EBCS crapped out.

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Seriously, just stop talking.
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Old 08-05-2014, 11:31 PM   #12
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Quote:
Originally Posted by dangerousatom View Post
We'll if it's actually coming out the exhaust side of the turbo, and your doing the boost test correctly then your valves are bent.

There is a slight chance your car is falling to a open valve spot at shut down, but I can't believe it's consistently doing it . . . Try turning the motor over by hand while pressurizing till the valves you should get pressure somewhere in a 1/4 turn of the crank.

If it still leaks the way your describing, your either mistaken or you need to check your compression.
Finally someone that knows what they are talking about. I did do a compression test but when the engine was cold so I got lower readings. I got just over 140 on all cylinders
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Old 08-05-2014, 11:34 PM   #13
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Quote:
Originally Posted by Jubert69 View Post
How do you know the air is coming from the turbine? Without the turbo inlet or downpipe off, I don't know how you can tell.



Seriously, just stop talking.
I removed the downpipe and put my hand in front of the turbine while pumping air into the turbo inlet with the tester
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Old 08-05-2014, 11:38 PM   #14
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Quote:
Originally Posted by VenomWRX View Post
I removed the downpipe and put my hand in front of the turbine while pumping air into the turbo inlet with the tester
Gotcha. Ok, there's a serious problem there. Hopefully there's just happens to be a bad leak in your turbo so all you need to do is replace the turbo.
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Old 08-05-2014, 11:47 PM   #15
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I hope it's the turbo. I didn't have any issues until I put this turbo in but I have never heard of air passing through the turbine from cold to hot on a turbo before if that's what is happening.
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Old 08-06-2014, 12:18 AM   #16
dangerousatom
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Pull the TMIC and test at the TB, if it holds there it's the turbo
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Old 08-06-2014, 12:45 AM   #17
Jubert69
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Quote:
Originally Posted by dangerousatom View Post
Pull the TMIC and test at the TB, if it holds there it's the turbo
This may sound like a dumb question, but I'm gonna ask it anyways. If his throttle is closed, wouldn't that block any pressure entering the engine?
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Old 08-06-2014, 12:54 AM   #18
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Quote:
Originally Posted by Jubert69 View Post
This may sound like a dumb question, but I'm gonna ask it anyways. If his throttle is closed, wouldn't that block any pressure entering the engine?

no...the throttle plate isnt a perfect seal in the tb
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Old 08-06-2014, 01:07 AM   #19
dangerousatom
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Quote:
Originally Posted by Jubert69 View Post
This may sound like a dumb question, but I'm gonna ask it anyways. If his throttle is closed, wouldn't that block any pressure entering the engine?
Heh no, like uncle said it's not an air tight closure, and the IAC Valve will let air by the throttle plate as well.
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Old 08-06-2014, 07:28 PM   #20
VenomWRX
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So I put the test on the TB and it still came through the turbo hot side. So would this be bent rods or something else?
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Old 08-06-2014, 11:19 PM   #21
dangerousatom
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It's time to take it somewhere and find out the bad news :-/
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