Garrett GTX2860R Turbochargers

What the Garrett GTX2860R is

The GTX2860R is part of Garrett’s GTX line; Garrett’s current version is the GTX2860R Gen II, rated at 200 to 475 horsepower on engines of 1.4 to 2.5 liters. It uses an 8 mm dual ceramic ball bearing cartridge, a 46 / 60 mm compressor wheel and a 54 / 47 mm turbine wheel. Garrett sells it with a turbine housing: V-band free-float housings in 0.57 and 0.72 A/R, or T25 5-bolt internally wastegated housings in 0.64 and 0.86 A/R.

Garrett says the Gen II compressor wheel gives up to 20% more horsepower than the earlier version and that Gen II turbos fit the same space as the equivalent Gen I turbos, although Gen II compressor housings do not fit Gen I wheels. This page lists Gen II turbos with T25 internally wastegated housings (0.64 and 0.86 A/R), stainless V-band housings (0.52 to 0.86 A/R) and an RB20DET-style T3 housing, bolt-on turbos for the Ford Focus ST 2.0L and Fiesta ST 1.6L EcoBoost, a twin-turbo kit for the 2005 and later Mustang GT 4.6L, a drop-in pair for the Nissan RB26DETT, and Gen I units, CHRAs and supercores. Garrett’s own guidance on turbine housings: a smaller A/R gives quicker boost response and more turbine power at low engine speed; a larger A/R lets the wheel flow more, with lower back pressure and more power at high engine speed.

Sources: Garrett GTX2860R Gen II catalog page · Garrett: Turbine Housings 101

GTX2860R Gen2 specifications

Wheel sizes are inducer / exducer, taken from the specification published for each part number. The turbine housing sizes are the ones on the listings above; the same turbo is sold with several.