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Aug 2013
Today, Garrett turbo has a wider selection of turbochargers available than they ever have before!
In the catalog, Garrett product are grouped by their frame size. The turbine frame size of a turbocharger center section or �CHRA� is dictated by its inducer diameter. The bigger the turbine inducer, the larger the frame size, so any garret gt or gtx turbocharger in the GT42 or GTX42 family has a bigger turbine inducer size than those in the GT35 or GTX35 family, and so on.
The model name of each turbo or Center section (CHRA), you�ll notice two digits directly after the frame size. These two digits designate the compressor exducer size in diameter, as measured in millimeters.
Let�s look at the GTX4294 as an example. The unit has a GTX42 frame size turbine (82 mm) coupled to a 94 mm (exducer dia) comp wheel.
If there is an �R� on the end of it, then that means the unit is a ball bearing turbo. So, a GT4294 is not a ball bearing turbo; whereas a GT4294R is a Garrett ball bearing turbocharger.
If an �X� appears between the �GT� and the first number, it signifies that this turbo features a billet compressor wheel with �next generation aerodynamics�. The Garret GTX line is visually different in that the wheels typically are forged (billet), fully machined wheels rather than cast.
Courtesy of MAPerformance
A Visual Guide to Garrett�s �GT� Model Numbers
