turbo casting numbers?

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

 

interesting. got pics?

 

heres a pic of my turbo last time engine was out in 2010 you can see marking says 2-2 most say 2-1

 

diffrence in auto and manual turbos maby ?

 

Im not shore mines a manual. I can only find 1-2 not 2-2 like mine has got me stumped

 

is you car 2+2 seaters?

 

LOL.

Just tell yourself that your 2-2 is better and rare.
Sleep better

 

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.

 

Sorry for late reply had no internet, and its a 2+2