It's a general misconception that there are "Seals" in a turbo. There are no "seals" on a turbo per say. They are more closely related to that of Piston Rings.
You won't blow your "seals" because of no restrictor, you'll just burn oil through the exhaust if you are putting to much oil through it. Nothing actually "seals" in a turbo.
I would recommend starting with no restrictor at all and slowly move up until it's not blowing smoke anymore. You're oil pressure will be the same regardless of your restrictor, so it wont matter what your oil pressure is running at, it's the volume you need to be concerned about.
It's better to piss oil out of your exhaust, then to cease the turbo up with too small of a restictor. I Would recommend you find out what oil pressure and restrictor the turbo uses from the factory, and go from there. if you have to do it "by chance", then start with no restrictor .
Hope this helps.
"" a bit more info""
