turbo q's?
 

can someone explain to me what all these numbers mean?

Precision Turbo T3/T4 .60/.63ar 50 trim

Re:turbo q's?
 

T3/T4 means it's a hybrid turbo using the .63 ar turbine housing and the .60 ar compressor housing. Could be the other way around, but most T3 exhaust housings are either 48 or 63. 50 Trim is the size of the compressor wheel.

Re:turbo q's?
 

how could i know what my turbo is, its a garrett t25 factory rebuilt brand new one, i've been told it has a t3 exhasu housing. on the inside of the turbo itself it says .48? but on the inside of the exhaust housing it says .80. what are the specks of a t25?

Re:turbo q's?
 

That sounds like one of the JDM Nissan factory turbos. They're Garrett T25's with a T3 flange. They're bigger than the T25's from 2nd gen DSM's. You really need to get your terminology down though, because I don't understand exactly what you're talking about.

I don't want to talk down, but I do want to make sure we're on the same page.
Given that, a normal turbo consists of 3 main parts
1. Exhaust housing (connected to manifold and downipe)
2. Rotating assembly. (houses the bearings, wheels, oil. water.etc)
3. Compressor Housing (connected to intercooler/Intake)

On which pieces are the numbers mentioned stamped?

Re:turbo q's?
 

inside the exhaust housing it is stamped .80 inside the compressor housing it is stamped, .48, the .48 is stamped where the air is coming outa the housing its on the inside.