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Old 05-03-2017, 11:10 PM   #1
I--RIDE--BIKES
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Default BW s362 oil seeping

Hey everyone.

So I have 125 miles on my brand new S362sx-e and am having a slight amount of oil seeping from the back side of the center cartridge by the turbine housing. It's max tilt from front to back is 10-13 degrees (am told that 20 degrees is max), has a -4 feed line and -12 drain. Also the feed and drain ports are vertical. It's on a new fully built engine with 3000 miles. Turbo hasn't seen much boost yet as the dyno tune is tomorrow.

Has anyone experienced this? Remedies? Thoughts?

A turbo smart oil pressure regulator was recommended as a possible solution.

Cheers!
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Old 05-04-2017, 08:43 AM   #2
WhatTurboLag?
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YES. I'm having this exact issue.


What is your PCV setup like? I was guessing mine was PCV related as I added an oil restrictor to mine and it still did it.

I also had cracked ringlands and a blown head gasket.


I didn't touch the turbo but I may check it before I put it back in but I may just run it and see what happens. I'm running a -4 feed with restrictor and -10 drain.

I'm in the process of putting in a built motor.
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Old 05-04-2017, 10:57 AM   #3
I--RIDE--BIKES
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What turbo are you running?

I have all 3 vent lines going to a large VTA AOS. So I'm fairly confident it's not crank case pressure. There is a restrictor cast into the center cartridge says BW so my best guess is still the extreme oil pressure.
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Old 05-04-2017, 12:03 PM   #4
WhatTurboLag?
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What size lines on the AOS? Do you still have a PCV valve?

It's a SXE s362 also.

There wasn't any kind of restrictor I saw machined into it.
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Old 05-04-2017, 12:30 PM   #5
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Where's your turbo mounted?
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Old 05-04-2017, 02:36 PM   #6
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There are 3 -10 lines running to the AOS.

The BW guy emailed me a diagram stating that here is a restrictor built in.

It's mounted in the typical rotated location.
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Old 05-04-2017, 10:04 PM   #7
Rideit636
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Do a leak down. How is your drain line setup?
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Old 05-05-2017, 03:48 AM   #8
I--RIDE--BIKES
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Well we sent it to 505 whp on the dyno today and the leak seems to be gone I think?
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Old 05-05-2017, 09:24 AM   #9
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Weird.
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Old 05-05-2017, 10:49 AM   #10
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how's the spool? when do you see full boost?
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Old 05-05-2017, 12:16 PM   #11
WhatTurboLag?
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Mines a .83 divided with a spool valve. And it's damn quick.
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Old 05-05-2017, 02:13 PM   #12
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We got a s366 on a hybrid with 9:1. i'm wondering how it's gonna rock twin scroll .91 ar
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Old 06-08-2017, 11:11 PM   #13
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Bump

About ready to start my car, never got it checked. Gonna hope for the best lol
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Old 06-09-2017, 01:31 AM   #14
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That's what I did and all worked out. That's not to say that it may still be seeping out my the turbine on the inside but it no longer is externally.
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Old 06-19-2017, 01:54 AM   #15
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Update: car runs now.

No leaks in any way. May take the restrictor out and see how it does now. Definitely was because of blowby or my previous catch can setup.
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Old 08-04-2017, 11:08 PM   #16
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Minor update. I still seem to have some seepage and seems like it's also coming out the turbine housing also, just slightly. Once you feed it the boost and "let it eat" any sign of oil disappears. This is presumably from the pressure differential in the housings compared to the center cartridge.

I'm still convinced that it's a case of over oiling.

Has anyone tried the new Turbosmart OPR which is an oil pressure regulator for your feedline? I'm thinking of giving one a try after a Borgwarner tech recommended it.
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Old 08-05-2017, 05:32 PM   #17
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Have you tried a -3 restrictor? That turbosmart OPR looks pretty slick though and would at the very least rule out oil pressure being the issue.

This is from full race's website

Quote:
For engines with high oil pressure and high rpm, -3AN oil feed line is the smallest size recommended. If -4AN or larger feed line is used, an oil restrictor may be required, but we recommend to try running without one.

Last edited by Delphi; 08-05-2017 at 05:40 PM.
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Old 08-05-2017, 07:52 PM   #18
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I did read that actually and was specifically told by BW during my convo that a restricter was built into the housing and that an unrestricted -4 should be used. Thats when he mentioned the OPR.
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Old 08-07-2017, 10:55 PM   #19
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I bought one for my build but to plumb the bypass from the opr would have been a pain since they don't recommend returning it into the turbo drain.
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Old 08-11-2017, 07:02 PM   #20
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Journal bearing turbos generally speaking want a good amount of oil flow...especially when there is no water cooling. The oil inlet on the BW's is big for a reason, but every engine is different.

If you are going to restrict flow...dont go mad and make it too small like a ballbearing turbo would need.
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Old 08-12-2017, 08:00 PM   #21
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So mines actually still leaking. Nowhere near as bad. But enough to smoke after a longer drive.

Going to buy a new center and send this one in I think. It still moves fine etc. the car currently is still running on a base map. But I have to my knowledge no boost leaks or pre turbo exhaust leaks and he turbo seems lazy.
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Old 08-12-2017, 08:37 PM   #22
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Have you established how much pressure you have at the oil supply to the turbo ?

Did you try any sort of restrictor ?

More importantly, are you sure both the drain is 100% clear and that crankcase ventilation/breathing is all good ?
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Old 08-12-2017, 10:43 PM   #23
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Before going through the trouble of removing the turbo, I'd redo your oil catch can setup. Instead of VTA, run a line to the turbo intake tube where it'll see vacuum. That should help reduce crank case pressure better than just VTA and may solve the smoking issue.
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Old 08-13-2017, 04:23 AM   #24
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It's hard to beat the simplicity of a large vent to atmos.

Unless the can/separator is exceptionally good ( and almost none are ) routing the vent anywhere on the intake path, will allow oil or dirty oil vapours into the inlet path.

And if you are wanting to connect it to the actual intake where it will see vacuum....then it 100% must have a proper working PCV system in place so boost can never blow into the crankcase...and when on boost it must have a good clear method of venting.
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Old 08-15-2017, 12:56 AM   #25
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Exactly and I have none of that.

A -12 off the block is definitely adequate for a catch can.


As for the turbo being lazy. It seems I also have an exhaust leak causing that. I swear this **** never ends.
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