Originally Posted by RageWoRX

Again a GT2871R with a 56 trim wheel has a compressor inducer measuring 53.13mm and an exducer of ....... 71mm Hence the GT28 .... 71R.

I am talking about an Actual 56 trim GT2871R ..... If you read all the way back to begining of this ..... He said he had GT28Rs with 71R sized wheels installed. So Yes you can still call this turbo a GT2871R even if its not technically a 56 trim wheel anymore but lets say a bit bigger (meaning compressor inducer measuring a bit more than 53.13mm now).

The exducer is still 71mm so even in Philty's case (I'm not getting into his custom setup) you can still consider this a GT2871R.

Just like a GT3071R is called a GT3071R because its in the GT30XX family and has a 71mm exducer.

However this does not apply to the GT2835/37/R/RS and etc as there final two numbers don't reference the exducer size they have around a 1.64” exducer size.

There is a difference between trim, inducer size, and exducer size. Not all the numbers on turbos relate to its trim. Most people don't realize this.

I hope this answers your questions.

-Jon

Originally Posted by MIAPLAYA

Bah Garretts naming convntion has always had me guessing anyways... Guess I'll just stick Turbonetics turbos..at least theres no guess what you get.If its a T4 50 trim they call it that..

Originally Posted by RageWoRX

I agree 100% with the naming conventions it is a bit odd ... but when you have been making turbos as long as Garrett has you tend to over complicate even the simplest things.

-Jon

Originally Posted by Philthy

Jon - you have more patience than I... The post name should be changed to Garrett Turbos 101 for beginners. lol