GT2871R trim size .

[sx boy]

Just bought a good ( I hope ) used one of these and not sure where to look for the trim size of the turbo , I know its a .64 but where will I find it ? I presume its stamped on the turbo somewhere .

Thanks

[R_34]

Inside the exhaust housing near the flange to the exhaust manifold.

[Jez]

0.64 is the A/R of the exhaust housing. Yuo want a 52 trim compressor - to find this out you need the part number on the plate on the core of the turbo or measure the compressor diameters.