Twin journal bearing turbos on mine with a Turbosmart OBR. My logic was to keep oil press for the engine first. I'd do the same for BB.

 

What's the right way to do this

Call the turbo supplier and ask??

 

I would use the turbo smart oil pressure regulator with 110lbs of oil pressure.

 

WIth a turbo you have to limit the MAX oil pressure or it will blow oil out the seals. You can do that however you want. I usually use a mig welder tip with a .035" orifice on a ball bearing. Ball bearing and journal bearing have different specs for max oil pressure so you should ask the manufacturer.

 

Running a FI S484 without a restrictor, oil pressure is 60ish psi cold idle, 40ish psi hot idle and 90+psi at WOT.
The oil cools as well as lubricates so if you have the drain to accommodate the volume, I'd rather have too much than not enough.

 

What I have learned is that you do not want to over oil a ball bearing turbo. Restrictors were the way in the past, but now the regulated oil pressure is the way to go.
Journal bearing turbo's are the opposite, feed them as much as you can.
I picked up a turbo smart oil pressure regulator, and am not going to run any additional restriction.

 

WIth a turbo you have to limit the MAX oil pressure or it will blow oil out the seals. You can do that however you want. I usually use a mig welder tip with a .035" orifice on a ball bearing. Ball bearing and journal bearing have different specs for max oil pressure so you should ask the manufacturer.

Isn't this dependent on oil pressure though? Wouldn't the volume be different depending whether you have 70 or 110 at WOT?

What I have learned is that you do not want to over oil a ball bearing turbo. Restrictors were the way in the past, but now the regulated oil pressure is the way to go.
Journal bearing turbo's are the opposite, feed them as much as you can.
I picked up a turbo smart oil pressure regulator, and am not going to run any additional restriction.

Your comment is my question, and perhaps the OP's, should I run a restrictor AND/OR regualtor?


This topic is a mirror of questions I have because I'm running a Ball Bearing turbo for the 1st time. I've never ran any type of restrictor with S400 frame journal turbos. I've always used a -10 drain and never had any type of issue. But obviously, a Ball Bearing setup is differnet. I'm willing to do what ever is needed, but the question is still valid. I did add a .090 restrictor, but I'm yet to make a run (and won't for another 3 weeks).

I've reached out to the turbo supplier, but am yet to hear back.

 

I am the original poster...
Don't add any restrictor's together with the oil pressure regulator.

 

I have never added anything and I ran 90psi with my bb turbo shit if I can remember right the inlet hole was only .040 never had a problem

 

This is kinda what I've always thought, every turbo I've ever ran, the feed fitting already has a pretty small hole in it.
I just assumed this was by design to limit the amount of oil flow.
Even when I had a drain that was less than ideal, I never needed to run one.
I think crank case ventilation plays a big role in it too.

 

Some ball bearing turbos have the orifice built in.