I was given this turbo, it is freshly rebuilt and intended for a mack truck as far as I can tell.
I do not have the compressor graph, just that it is made by schwitzer, model number 63A-007.

From my measurments it has a A/R of 1.25 with an inducer bore of 3" (which would lead me to beleive it would support 600-650hp?).

The area of the turbine scroll is 7in^2 however it has two ports, by blocking one the A/R would drop to .6125, is this feasible?

THe exhaust flange looks to be a T6 also.

Basically any help on a compressor map, along with thought about boost threshold and response on a 383-427in^2 motor, would be appriciated.

http://memimage.cardomain.net/member...81_32_full.jpg

http://memimage.cardomain.net/member...81_34_full.jpg