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5 GT Turbo Advice regarding oil in turbo intake pipe.

Mark Davis

Brapmaster extraordinaire
I need a bit of advice please.
Currently getting a little bit of oil in my turbo inlet to air filter pipe. See pictures.
Is this normal ? Any idea what could be causing it?
There is no excessive play in shaft, boosts fine, no smoke, (a tiny bit on start up) no strange noises.
No issues with oil level or pressure either.
My K&N breather filter has started dripping a bit of oil recently so have purchased catch tank, just not plumbed in just yet.
I should add, GT2560r, no more than 6 months old, probably covered 2000 miles.
So yeah any thoughts, advice or comments?
Thanks in advance.


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Hi Mark
Is the turbo a roller bearing if so have you got an oil restrictor and what oil pressure are you running
Is it just the air filter going into the turbo or has it got the crank case breather as well

Andy
 
Hi Andy,

Thanks for the response.
It's a dual ball bearing turbo and currently I run a Cossie style large K&N filter coming off a 90 degree silicone elbow with no crank case breather. I have blocked off the breather hose coming from the inlet manifold and ran a filter off the top of the standard black breather pot on the water pump side. The catch tank is now fitted but I just need to plumb it in.

Currently no oil restrictor.

Regarding oil pressure, I am currently reliant on the standard gauge until I install by Stack gauge and I know the standard gauge isn't the most reliable but it shows a comfortable 2 bar at idle and 4/5 under load.

I have no symptoms of anything untoward going on as explained above, just seems odd a little bit of oil in in the hose.

Cheers

Mark
 
Yeah that's what I have done Adey,

To be fair I have noticed it a couple of time over the last 3/4 months. I am wondering if it has anything to do with the angle of the air filter hose and it not breathing very well ? Not sure but the car operates as it should, doesn't smoke, boosts fine etc etc. Just the oil in the hose as shown in above pics.

I'll monitor over the next couple of weeks.

I've also bought a new smaller inlet flange which arrives today, I'm going to change the current 90 reducer slightly.
 
I was under the impression all roller bearing Turbo's should have oil restrictors.

I just fitted up Johnspins GTX and I hated doing it, the oil restrictor hole is TINY and it felt so wrong lol


The restrictor hole on the GT25606 is tiny @DaveL485 was unsure to fit it or not.

@Mark Davis, When i was getting the oil feed made up for my GT25690r the bloke doing it asked for the restrictor so he could fit it up, i told him although i have one i was told not to use it. When i went back to collect the hose he had looked into it and they needed the oil restrictor putting on.

I came home had a look on the net and decided to to put it on as it does say to use it.... can't remember the name of the website, but a quick search should find something.

Im offshore so can't check mine for any oil etc but if you have one put it in and run it for a bit and see what happens.....
 
A bit of googling and I found this on Garrets website.

Oil pressure entering a ball-bearing turbocharger needs to be between 40 psi and 45 psi at the maximum engine operating speed. For many common passenger vehicle engines, this generally translates into a restrictor with a minimum of 0.040" diameter orifice upstream of the oil inlet on the turbocharger center section. Again, it is imperative that the restrictor be sized according to the oil pressure characteristics of the engine to which the turbo is attached. Always verify that the appropriate oil pressure is reaching the turbo. The use of an oil restrictor can (but not always) help ensure that you have the proper oil flow/pressure entering the turbocharger, as well as extract the maximum performance.

What can I assume a healthy C1J oil pressure is ? based on the fact my standard gauge may or may not be accurate. 4 bar equals 58psi so definitely too much pressure. @Scott_higgy any chance of confirming the size restrictor you used mate ?

Cheers

Mark
 
My gt2560r has a restrictor built into the core apparantly so never fitted one & no issues.

A bit of oil is fairly common in the intake hose - that looks a little bit much though. Any play in the turbo shaft ?

As for oil pressure at best you will see 50lbs when hot at 3k. 60+ lbs on a cold engine,
 
Yeah Steve just confirmed mine has a restrictor built in also.

No play in shaft, all seems normal.

Ill give it a proper look tomorrow and check oil return and sort breather system etc.
 
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