OT: Rajay turbos

[clayb]

OK, I put the disclaimer in the title. And I know alot of folks install
EFI to keep the turbos happy, and some sharp people read this list.

If any of you are familiar with turbos, help me out, please.

It may be time to overhaul the old Rajays. On of them has a slightly
loose shaft, and I don't want to be sidelined with a turbocharger
rebuild in the middle of the season, next year.

I've heard tales that the compressor side of the old Rajays is pretty
inefficient. Anyone know if the exhaust side is any good? Can I put a
nice compressor wheel on during a rebuild, and get some extra kick out
of these things? The current compressor wheels have shorter vanes
(axially) in between the larger vanes on the compressor. I'm not sure
how unusual that is.

I haven't run them very long, before burning the flange gaskets, but
they're capable of at least 17 psi on my 454 chevy, and definitely need
wastes operational to control the boost. They can generate 8 psi boost
as low as 2500 RPM. The model is 301 E 10. I think the "10" is for a 1.0
exhaust housing, and the "E" is the compressor trim?

What are the implications of a more efficient compressor? I already can
get alot of boost, and the turbos seem capable of flowing 454-sized
volume. I haven't done alot of driving at 6000 RPM yet, tho. How do I
know if I could benefit more from a higher pressure ratio for more
boost, or higher ultimate flow, or is it possible to achieve both?

Will I see less exhaust back pressure, for a given intake manifold
pressure, or, a higher ultimate manifold pressure with the same exhaust
back pressure?

Any recommendations on parts suppliers or shops for old Rajays?
- Clay
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