Hey guys,
I'm having an issue or at least I think its an issue and not normal. I recently finished building a 2.4L on my evo 8 and during the build , I slapped on a FP Black DBB turbo with the oil restriction line.
Before I start boosting it I wanted to do a boost leak test. When I took off the intake coupler from the turbo , I noticed some oil on the coupler and looking into the compressor housing of the turbo, I also noticed some oil. Now when I mean some oil, I mean a slight glaze of oil around the inside of the compressor housing. Thinking I may have spilled some oil, I cleaned it up and drove the car around for another 100miles. Came back to the the pressure test and oil again.

Now, here are my questions...
Is this normal? If not what can it be?
One thing I can think of is too much crank case pressure....currently I did not put my catch can on and just put a small breather type filer on the valve cover. Is there something I can do to test this? Am I going about diagnosing it correctly?

 

I should also say that I did boost it up to 10-15lbs (not wot) a couple of times. As far as the crank case pressure, I've seen through my DSM days that when you have too much crank case pressure one sure sign is the oil dip stick popping off and that has not happened.

 

Yes, this is normal. The reason for the oil on the compressor side is because you are not using a catch can.

Install a catch can and the oil there will disappear.

I like to delete the PCV and install the catch can using STM's -6AN valve cover fittings and a catch can with a breather (using -AN fittings).

See here:
http://www.streettunedmotorsports.co...r_fittings.htm

http://www.streettunedmotorsports.co...l_catchcan.htm



-Bink

 

Sorta confused..the stock line that usually goes from the valve cover to the intake pipe is not there. What I did for temporary fix is just put a breather filter onto the little nipple that is on the side of the valve cover.
So how does the oil get to the compressor housing?

 

Ah, I did not see you mention that before.

If the line is not connected there, and oil is getting into the compressor housing, it could be leaking through the turbo's seals. Is the turbo new or used? How many miles are on it? The oil line that you are using, is it coming from the oil filter housing?

You could always give FP a call as well and see what they say.



-Bink

 

It was a new turbo and I think I found the issue. I will post it up once I confirm it.

 

So what was the issue?

 

This is normal - when the turbos are assembled, oil is used in the bearings and cartridges. My EF3 had a slight oil glaze on the compressor inlet before I even installed it.

 

Where did you think the oil was coming from?

 

I think its too much blow by.