I never even had to tear one down.
they seem to spool later than I envisioned…hmm
I did a back to back test on the D series From a Garrett 57 Trim. I the holset did spooled the same if not a little sooner then that turbo.
I thought they would be closer to dBB GT series spool…not old school T series technology from the 70’s…I know Holset is floating bearings as well