Recently looking at stock turbos online and seen the casting numbers say m24 garrett ar48 2-1. Then did a bit of googleing most of them all say 2-1 Then looking at photos of my turbos last time motor was out mine said m24 garrett ar48 2-2 why is mine 2-2? Any info would be great cheers
I would say its a casting reference for batch id. It has no relevance to auto, manual or left and right hand turbos. I have here 7 turbos with these on them, 1-1, 2-1, 1-2 and 2-2 in any combination of auto/man, L/R.
This is purely a guess from looking at general injection molding. If the mould is designed to make 4 items, there would be a reference to the position in the mould. It is possible that 4 identical components are setup as a 2x2 grid. 1-1 being upper left 1-2 being upper right 2-1 being lower left 2-2 being lower right My initial thoughts were that 2-2 was version 2 modification 2 Like V2r2 in software design. But I think it is just casting position in a mould. Maybe someone else can offer a different answer and I am completely wrong.
