Herbst

So I got a JCB GT2560S turbo a while back and when I bought it I didn't realize how weird the exhaust housing was. I just saw it was close to a t25 and assumed it was a t25. Someone told me a SR20 housing would work, but it was way to small. I sent the specs to ATP Turbo but unfortunately they couldn't identify it. I'm about to scrap this whole turbo if I cant find a housing that will fit soon. Any ideas on a housing that would work? The turbine exducer is 44.2mm and the inducer is 53.85mm give or take a little. It seems like its a T28 turbine, but the exducer is a little to small. I was thinking of trying a t28 housing, but don't want to spend money on just guessing.

Heres the parts list of the turbo:
Garrett Model GT2560S Repair List - 773125-0006 reference - Turbos - TurboMaster

mmmjesse

t25 and t28 is the same turbine housing. The difference in them is really just on the compressor housing. I have a 2560s off an isuzu diesel but it has a different looking center section than yours. Yours is an oil only while mine is oil/water. The t25 compressor housing bolted right on with no issues.

for reference. Stock T25/28 Turbo Specs - Nissan 240SX Forums

do you have a pic of the housing you have for it?

Herbst

I actually remember you replying to my original thread before I bought the new housing haha.Yeah, here are some pictures of the housing I tried. When I installed it, the exducer was hitting the housing, so I'm assuming it was a 62 trim housing which is just a little too small for my turbine. And I thought the turbines can different between the two. I thought GT28 has a 53.85mm turbine with either a 62 or 76 trim. While the GT25 has a 53.0 mm turbine. When I measure my turbine I get 53.85mm with like a 67 or so trim. I haven't measured the compressor yet, but may take it apart just to see what it reads.

mmmjesse

not sure on the gt28xx turbos but the 2560 is only a 62 trim. That is all i have ever seen it in.

Herbst

Yeah that's all I can find too, that the main reason I looked into GT28 housing because they go up to 76 trim which leaves a 3mm gap all the way around the exducer, which may be too much but I have no idea. I may also look and see If I can find a used gt2560 CHRA since I have both the compressor and turbine housings. I just cant believe the turbine housing is made by garrett, but doesn't match any of their other housings.