Turbo Oil Feed "Restriction"?

[Gyrhead]

I've been doing some research on turbo oil feed lines as I have a brand new Garrett T3/T4 to plumb and read somewhere that turbo oil seals are generally only good to 25-35 psi whereas the motor's oil pump is capable of making much more under RPM. "They " have stated that a restriction needs to be placed in the turbo oil feed circuit to prevent this gradient. As a firefighter, this seems counter-intuitive to me. As a restriction is placed, pressure on the other side of the restriction goes up and volume goes down. Am I on the point here, or do I need to pass the bong to the next guy now.

[Patrick]

Oil line feed restrictors have been used in certain specific applications, as the one I'm about to point out, but not on the original equipment SVO T-3 turbocharger for production purposes.

The Buick V-6 Tubos on the Indycars several decades ago (Roberto Guerrero,Kenny Bernstein, 240 MPH) ran a .045" restrictor.

Ball bearing turbo installations may suggest a restrictor, since they don't require as much oil flow as the T-3.

The original equipment "seals" on a T-3 are not truly seals. They are similar to piston rings, and have a gap at the end. A certain minimal amount of oil is likely ( or guaranteed? ) to escape.

The original equipment oil feed line has a wall thickness that appears to be the restriction that concerns you. Maybe Ford engineers had it figured out that way to negate the need for extra restrictor parts.