GM1, GM3, GM8 Turbo?

[BR455]

What are the actual differences in the various turbo models for the 6.5? Does anyone know the A/R numbers for the turbine side? Does anyone have compressor maps for the different models? I know some about turbos, but I can't seem to find relevent information on these.
Thanks
Brent

[More Power]

I've not run across the turbo specs in all the GM literature I've seen. I do know that the GM-8 has a slightly larger compressor housing than its predecessors.

Jim

[ronniejoe]

IHI will not release information on these turbos. They are known to be very tight lipped about maps and such.