Garrett GTX3076R Turbochargers

What the Garrett GTX3076R is

The GTX3076R is part of Garrett’s GTX line; Garrett’s current version is the GTX3076R Gen II, rated at 400 to 750 horsepower on engines of 1.8 to 3.0 liters. It uses an 8 mm dual ceramic ball bearing cartridge, a 58 / 76 mm compressor wheel and a 60 / 55 mm turbine wheel, and comes in standard and reverse rotation. Its turbine housings come as T3 and V-band free-float housings or as T3 5-bolt internally wastegated assemblies, which Garrett supplies without bolts, clamps or actuator.

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, some with a compact compressor housing and actuator), T3 housings with a V-band exit, an RB25DET-style T3 housing, reverse-rotation versions with V-band housings (0.61 to 1.01 A/R), Ford Focus ST 2.0L EcoBoost kits, Gen I units without a turbine housing, and CHRAs, supercores and compressor housings. 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 GTX3076R Gen II catalog page · Garrett: Turbine Housings 101

GTX3076R 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.