Hi
How do you specify a turbo oil restrictor ? if I have to order one, how is it identified ? also for the turbo oil outlet flange, how is it specified ?
Check with the turbo manufacturer. They are the ones that will reject your claim if the restrictor is too small.
Again the turbo people should have some designs available for different engines.
If you are designing this installation on something that has not been done, copy the install that is closest to yours, and then add a little more for insurance. Good luck.