Have you ever seen how small the oil passage inside the engine that the oil line for the turbo connects to? I have, it's about as big around as a pencil lead. I bet turbos that are oil cooled have alot more oil flow than systems designed to be water cooled.

 

actually the whole oil system in the motor is basically the same dia. through out. And that includes the outlet for the turbo.... Thats the onlyway to really maintain or have high oil press.

 

Exactly right, Non-water-cooled turbos have a very different oil system the is desighned to lubricate and cool the bearings. Peaple who make comments like this...
...don't know what they're talking about, and shouldn't be telling others to shut up. The coolant supply is there for a very good reason, and it'd be pretty stupid to run without it.