| Rotating assembly and compressor cover ID
Located on the compressor cover discharge, typically where the hose slips on, on the bottom of the discharge will be either a 4 digit and 1 letter code or the physical name of the turbo, engraved onto the cover.
Example 1: "5031E"
50 is the compressor wheel in MM
31 is the turbine wheel in MM
E is the TO4E compressor cover
Example 2: "GT35RLS"
GT35RLS is a GT35R turbo with a TO4S compressor cover
Example 3: "PT106G"
PT106 turbo with a G trim turbine wheel
Turbine Housing ID
Usually on the side of the foot of the turbine housing there will be a CNC code cut into the housing. May also be found on the face of the discharge side.
Example 1 "THF3-52"
T3 Ford style 5-bolt discharge with a .63 A/R ratio for T350 76 trim turbine wheel
Example 2 "THM3-52W"
Mitsubishi style turbine housing with a .63 A/R ratio for the T350 76 trim turbine wheel with integral wastegate and no divider wall
Example 3 "TH6876A"
T4 style turbine housing with a .68 A/R ratio cut for the 76 P-trim turbine wheel with a 3 5/8" OD V-band discharge flange
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