T3/t40e .60 compression with .96 a/r. At what RPM's do you guys think this turbo would make full boost?
Or would an .50 compression and .63 a/r be better?

 

nominally you want a .63 turbine for our engines. its a very rough guess but i wouldn't really be too surprised if it hit full boost by 4,000 rpm.... i'm not sure at all though. there are way too many variables that decide where something like that would spool.