Oil coming out turbo under boost
11-11-2017, 10:55 AM
#1
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Oil coming out turbo under boost 
My car just started pushing out of the turbo and out the exhaust under boost. I'm thinking it's a problem with the drain. It's a 6.0 and I got it draining into the front of the pan. Anyone have any other suggestions on what's causing this?
11-11-2017, 12:44 PM
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11-11-2017, 03:29 PM
#4
Oil you see as a liquid, pushing around a seal for some reason.
So, any of these are possible with turbos, and the percentage is chance IMO
1. bad seal/clearance around seal (49% very probable)
2. too much oil pressure (bad feed/drain) overwhelms the seal (51% more probable)
3. a crack/hole somewhere letting oil through (0.1% very unlikely)
The seal is sometimes damaged by compressor surge. If you were running high boost pressures (15+psi) without a bypass, when you lift the throttle the air rushing backwards through the compressor slams the wheel/shaft around and ***** everything up inside the turbo a little bit each time. Blades get bent/worn/brittle and the shaft/bearing/seals get damaged. Many turbo manufacturers are now including bypass on their compressor housings, and anti-surge housings, in an effort to control the devastation caused by ignorance I suppose.
So, any of these are possible with turbos, and the percentage is chance IMO
1. bad seal/clearance around seal (49% very probable)
2. too much oil pressure (bad feed/drain) overwhelms the seal (51% more probable)
3. a crack/hole somewhere letting oil through (0.1% very unlikely)
The seal is sometimes damaged by compressor surge. If you were running high boost pressures (15+psi) without a bypass, when you lift the throttle the air rushing backwards through the compressor slams the wheel/shaft around and ***** everything up inside the turbo a little bit each time. Blades get bent/worn/brittle and the shaft/bearing/seals get damaged. Many turbo manufacturers are now including bypass on their compressor housings, and anti-surge housings, in an effort to control the devastation caused by ignorance I suppose.
11-11-2017, 06:39 PM
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Yeah I'm gonna check the feed and drain. I've only
got the car to 7lbs so far. i bought this turbo when on3 first started making turbos and it sat for like 4 years. I didn't know if it was junk from the start. It worked good for a while now just started happening
got the car to 7lbs so far. i bought this turbo when on3 first started making turbos and it sat for like 4 years. I didn't know if it was junk from the start. It worked good for a while now just started happening
11-11-2017, 06:55 PM
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Another thing to check are your breathers on your valve covers make sure they are clean and can breath. If filters are dirty blowby has no where to go and will put backpressure on your turbo drain. You did say it only happens under boost and did not use to do it. Filters were clean when you started and over time have become a restriction possibly.
11-11-2017, 07:27 PM
#7
That is true and by the same line of thought you must also consider gravity, since it acts on the liquid no matter what shape the line.
gravity applies a force everyone is familiar with while the blow-by example given above is a much less recognized point of view and even more important in my opinion, since PCV is basically the first rule of high mileage engines / street cars.
gravity applies a force everyone is familiar with while the blow-by example given above is a much less recognized point of view and even more important in my opinion, since PCV is basically the first rule of high mileage engines / street cars.
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11-12-2017, 01:53 PM
#8
Another thing to check are your breathers on your valve covers make sure they are clean and can breath. If filters are dirty blowby has no where to go and will put backpressure on your turbo drain. You did say it only happens under boost and did not use to do it. Filters were clean when you started and over time have become a restriction possibly.
Good luck
11-19-2017, 04:53 PM
#13
I've seen OEM turbos blow oil after 125,000 until 200k+ still going all chipped up and abused, whining, still making the car move. Sure its down 25% in power at that point but I am always amazed how long a turbo can live in some applications when the major parts materials and oiling system is correct.
The Borg warner manufacturer pretends to be OEM so we can treat it like OEM sometimes.
However the cheap style "no name" or "Ebay" units you would automatically expect to be very sensitive to small perturbations in operating conditions, because of reduced materials or clearances quality. If it was welded it might crack, If it was electronic it would have poor board components etc..
The Borg warner manufacturer pretends to be OEM so we can treat it like OEM sometimes.
However the cheap style "no name" or "Ebay" units you would automatically expect to be very sensitive to small perturbations in operating conditions, because of reduced materials or clearances quality. If it was welded it might crack, If it was electronic it would have poor board components etc..
11-19-2017, 10:05 PM
#15
Had a friend that had that same problem back in the day. It was the seals! When you fix that problem fix the other issues that lead to this problems. Vent the valve covers to a catch can, and make sure you have a good BOV. and delete the PCV stuff.
