Hours of research later, still no for sure idea what this is. I think it came from/was destined for diesel farm equipment. I'm pretty sure the compressor is a 50 trim t3, still confused on the turbine...
So garrett makes a t3 60 trim easy available, I thought that's what this was. The inducer is too small though. A 60 trim is 46mm and this one measures 42mm, 50 trim. Guessing because I can't measure so hot without removing the cover, it's locked on hard with torx bolts. Can't be larger than the inlet diameter though, right?
It has a 50/64mm 11 blade turbine wheel, looks to be 451314-0001
from this page here.
Turbine Wheels - Garrett Racing Applications - TurboMaster
That's bigger than what I have now, so I don't think my china turbine housing is gonna fit. It's 46mm exducer with the same 64mm inducer. Bummer, no chance I'll adapt an external gate to my 1.6 junk.
Brain preferred the china turbo to the super 60 IIRC, from this plot here. What I gather is this is a comparison of a 50 trim comp and turbine vs a 60 trim comp and turbine, just a slightly larger turbo all around.
china turbo 60/42mm comp, 46/64mm turbine. My Garrett is 60/42mm comp, and 50/64mm turbine.
So I've found half a genuine china turbo, I guess. That's kinda cool, I don't think garrett 50 trim t3s pop up much. I am assuming all the garrett t3's use the same turbine, or at least nothing ever smaller than 62 trim and I'm guessing that's the 62 trim wheel I have.
Comparing to the china turbo I expect somewhat slower spool with free-er flowing top end, maybe I won't have to taper boost? I could be alright with that, especially while swapping to a 1.8. I'll probably have to switch to external wastegate, or buy one of those
super 60 5 bolt turbine housings. If they'll fit. Just have to hope that the top end is currently choking from the smaller turbine, not the tiny compressor...
Can anyone confirm my guess that a garrett super 60 T3 uses 50/64mm turbine wheel? My google-fu is failing...