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Oil Bubbles after Holset install.

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96WhiteTSi

10+ Year Contributor
127
4
Mar 6, 2009
Reno, Nevada
I finished installing my HX40 today and started up my car to test pressure going to turbo from OFH noticed my oil drain has a LARGE leak in it leaving a puddle on the groud with... AIR BUBBLES!!!! i turned the car off and pulled dip stick.. bubbles in pan as well...

Before all this i had a garrett 50 trim on a janky manifold and different oil drain....and never seen bubbles....

I swaped oil pans..installed fp manifold.. hx40.. map housing.. and new feed line from OFH

the feed line is the kit you can buy from extreme psi (4an I believe with 1/4" npt)

Installed the oil pressure gauge between oil feed line and that 1/4" npt that comes with the kit..

car still has balance shafts .. cold start(as in sitting for over a month COLD) I was seeing 30psi oil pressure on 20w50 VR1 oil..

also put in new radiator and swaped to speed density ( these should have nothing to do with it... but putting out information of everything i did)


I thought maybe the turbo isnt getting enough oil and its causing the bubbles in the turbo itself ...

Any ideas or help with this matter ... PLEASE!!!!
 
Do you think you might have over filled it with oil? Out of curiosity, is the new oil pan that you installed oem or aftermarket?
 
Never heard of such a thing.

Oil pumps can essentially cause cavitation- especially until the oil reaches operating temps. That's all I've got. LOL

Hrm... I was counting on you to know all the answers!!!!

Do you think you might have over filled it with oil? Out of curiosity, is the new oil pan that you installed oem or aftermarket?

OEM pan with the right amount of oil...
 
The oil going through the turbo is going to be aerated to some degree.
 
Thats what I thought as well Morphius but why with my old set up (50 trim) it didnt do that and now it does.. makes me go.. hmmmmmm


How would you know, as the old setup wasn't leaking, right? Some amount of aeration is expected in your engine oil.
 
Last edited:
If you were having aeration issues, the pressure on the oil pressure gauge would bounce. Try doing a high g left hand turn at high rpms, and you'll see.
 
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