Yep, Seems the engine had broken ringland's at the time thanks to a bad 'run in tune'
Had no signs or anything obvious until after this tune. (different tuners)
This is the dyno sheet From my RB30 Patrol, on 33" muddies.
Turbo is an hypergear Externally gated ATR43, .82 turbine With smaller Comp cover to clear engine mount.
20psi.