turbo size?

I think im right but in a say t34 turbo does the 34 stand for the size in mills of the turbos intake?

help appreciated here

all it means is that it's a T series turbo with the exhaust side being smaller than the compressor side. This essentially gives you characteristics that are more preferable from a smaller turbo (fast spool) and mates it with characteristics that are preferably from a large turbo (more CFM's).

Along with is being a T series, there are also many trims to choose from based upon application. The larger the trim, the larger the blades, the more boost, the more CFMs, etc....

hopefully that helped a little bit. Check the link out as well

http://www.automotivearticles.com/Turbochargers_Design_and_Related_Parts.shtml

t3/t4 means hybrid turbo with t3 turbine and t4 compressor. (just to support what was already said)