led-panzer's 1984 300D 4-speed
led-panzer's 1984 300D 4-speed
Right. Forced had a good write up on his forum, when he got his he221 he played with a variety of restrictor sizes with a gauge after the restrictor. IIRC, a .045 hole resulted in no more than 75psi reaching the turbo at max oil pressure and no less than 15psi at idle.
So 1.5mm is roughly .060, which (to me) is passable. I can't remember what the max psi numbers were for a .060 but it's not that far off from .045
I've put probably 50 miles on my setup with absolutely no turbo issues/problems.