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Old 12-06-2012, 01:53 PM   #1
kuntryquest
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Default OVC Causing oil starved turbo?

I'm being told that my OCV / AVCS is more than likley the cause of my turbo failure after 4.8 miles for the break in tune. The turbo was primed, and let idle with break in oil ( rebuild motor also ).
My turbo oil feed is line is at the "engine oil pressure" banjo set up.
This valve seems totally unrelated to any sort of turbo failure, correct?



2005 LEGACY GT
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Last edited by kuntryquest; 12-06-2012 at 02:05 PM.
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Old 12-06-2012, 02:00 PM   #2
RoadKillDMD
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Blurple

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<Fill

<Out

<Your

<Profile

We would like to know what we're working with.
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Old 12-06-2012, 02:21 PM   #3
tazswing
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ah, what turbo? b/c there are significant difference in terms of the needs of different turbos for oil needs.
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Old 12-06-2012, 02:26 PM   #4
kuntryquest
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Its a BNR stage 2 18G.
18G comrpessor wheel/TD05H turbine wheel
We utilize the original equipment turbine housing, compressor housing, wastegate actuator and water lines on the first 3 stages. We highly customize a Mitsubishi TD05 CHRA to fit in the stock VF40 housings.
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Old 12-06-2012, 04:10 PM   #5
kellygnsd
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They could be talking about the strainers in the banjo fittings. There was a TSB a while back recommending that they all be remove. They have been know to gunk up and starve turbos and AVCS solenoids of oil.
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Old 12-06-2012, 04:15 PM   #6
kuntryquest
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Quote:
Originally Posted by kellygnsd View Post
They could be talking about the strainers in the banjo fittings. There was a TSB a while back recommending that they all be remove. They have been know to gunk up and starve turbos and AVCS solenoids of oil.
Those filters are long gone.
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Old 12-06-2012, 04:18 PM   #7
kuntryquest
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Him -
Quote:
Those OCVs go out all the time. They are the cause of a majority of the turbo failures of the LGT/OBXT. Trust me on this. If there are signs of heat and friction, then you know the problem is oil starvation which would stem from the OCV failure. I have seen engine failure contaminate the turbo even with the filters installed.
Me -
Quote:
I still don't understand how the OCV can cause an oil issue. The pressure T's before it goes to the OVC. There is shaft play in the turbo, enough to let the wheel touch the housing.
Him
Quote:
All I know is if you don't replace them if they are bad the turbos will die one after another. I get VF40 cores in all the time that have one 5 minutes run time and shafts are snapped. Very common!
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Old 12-06-2012, 04:33 PM   #8
tazswing
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Well, I am going to fire my tuner off an email about this since I have an OXT and if what this guy is saying is correct, I need to keep this in mind.
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Old 12-06-2012, 05:44 PM   #9
kuntryquest
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My tuner has never heard of this, and says they have NEVER replaced one for this reason. Seeing the oil PSI goes to the turbo before going threw the valve.
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Old 12-06-2012, 05:50 PM   #10
tazswing
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Quote:
Originally Posted by kuntryquest View Post
My tuner has never heard of this, and says they have NEVER replaced one for this reason. Seeing the oil PSI goes to the turbo before going threw the valve.
I'm no expert by any means, but the oiling issues I have heard of for turbos come back to the oil feed line; feeding too much oil (someone changing to a ball bearing from a journal bearing and not reducing oil flow) or too little oil due to in-line filters (not an issue as you stated) and trying to use the OEM line with a larger journal type.

What has a search turned up? I will post up when I hear back.
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Old 12-06-2012, 05:58 PM   #11
kuntryquest
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The only thing I can find on the OVC is when it throws a code. My car hasn't thrown a code and as stated only has 4.8 miles. I went with the Hi flow oil line kit and banjos to ensure oil flow.
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