Garrett GTX4720R Gen II 76mm Turbocharger

The GTX4720R Gen II 76mm is a Garrett GTX Gen II large-frame turbo with Gen II compressor wheel aerodynamics and a 0.88 A/R (area-to-radius ratio) compressor housing volute. The supercore and turbine housing are sold separately, and the supercore accepts Garrett GT and GTX T6 turbine housings of the same frame.

Garrett rates the GTX4720R Gen II 76mm for 1,025 to 1,850 horsepower on 2.5 to 10.0 liter engines.

Key Specifications

• Series — GTX Gen II
• Frame size — 47 frame
• Horsepower rating — 1,025–1,850 hp (Garrett rating)
• Engine displacement — 2.5–10.0 L
• Compressor wheel — 76 mm inducer, 120 mm exducer, 41 trim, 0.88 A/R housing
• Turbine wheel — 93 mm inducer, 84 mm exducer, 82 trim
• Maximum turbo speed — 85,000 rpm
• Supercore part number — 851285-5013S

Turbine Housing Options

Each turbine housing is listed by A/R (area-to-radius ratio), inlet flange, outlet and wastegate type. "Internal" housings have a built-in wastegate; "External" housings are free-float designs that require an external wastegate.

Garrett: Interchangeable with GT/GTX 4708 4709 4718 4720 Supercores.

Important Information

Garrett calculates its horsepower ratings from the compressor map choke flow, which represents the potential flywheel horsepower of the turbo. Actual results depend on the engine, supporting modifications and calibration.

Garrett sets the maximum allowable speed for this turbo at 85,000 rpm. Operating above that speed can damage the turbo and cause premature failure. A turbo speed sensor (sold separately) lets you monitor shaft speed.

For race vehicles only. Not for use on public roads.

Installation and Tuning Available at Race Protocol

Turbo system design, installation and dyno tuning are available in house. Call (724) 732-8948 to discuss your build.