So, here is a project plan:
(1) Fit current GT28V and water to air intercooler, get VNT control working well.
(2) Upgrade compressor to Mitsubishi 19T, Small 16G or Disco Potato or ? Problem is shaft diameter is 5mm or 5.5mm (cant remember), very small. I would like 48-49mm inducer.
(3) Probably fit a 12HT to my 80 series at this stage
(4) Add second turbo
(5) Snap GT28V turbine shaft and or break conrod under heavy boost.........
#5 notwithstanding, this rational is a gradual approach that allows some learnings.