Ok, so I really don't know if this would be useful at all, but I have an old Garrett T3 from my old Volvo 740 Turbo. Assuming I have my thoughts correct, the Volvo is a smaller (2.4L), lower compression motor and spooled that turbo at around 2300 RPM, so shouldn't a 617 spool it quicker? The main reason I am asking this is because the T3 from those Volvos is water cooled... i.e. they last 250,000+ on a Volvo....and they're capable of around 15psi (according to the Volvo guy I know, I don't have any specific facts to back this...) reliably.

What do you guys think?