Garrett G-XRace GXR47-76 76/109mm Ultra Street Super Core

A purpose-built 76.6mm super core designed specifically for the Ultra Street drag race class

The Garrett G-XRace GXR47-76 super core is engineered for competitors running the Ultra Street drag racing class where the 76.6mm compressor inducer rule applies. Carrying part number 953234-5001S, this unit is a complete CHRA and compressor wheel assembly rated to support up to 1,700 horsepower across a wide displacement range from 2.5L to 10.0L. Garrett's XBoost technology drives the compressor efficiency improvements that allow this turbo to deliver denser, cooler air charge at the elevated flow rates required by four-digit horsepower applications. The compressor features a 76.6mm inducer and 116mm exducer, paired to a 93mm turbine inducer and 88mm exducer, with a maximum allowable turbo speed of 102,500 RPM. The super core ships ready to pair with your choice of turbine housing from Garrett's compatible turbine kit lineup.

XBoost Technology

Garrett's XBoost compressor aerodynamics are engineered to increase both peak power output and compressor efficiency over conventional designs at high flow rates. The result is a more efficient air charge at the compressor outlet, meaning lower charge temperatures and higher air density entering the engine. In racing applications where every degree of charge air temperature matters, the efficiency gains from the XBoost design translate directly into more consistent power runs and more headroom for aggressive timing and fueling strategies.

Lightweight Aluminum Backplate and Speed Sensor Port

The GXR47-76 uses a lightweight aluminum backplate to reduce overall turbo assembly weight, which improves spool response and reduces rotational inertia. A flange-style speed sensor port is integrated into the compressor housing, allowing installation of Garrett's compatible speed sensor systems for real-time shaft speed monitoring. Keeping turbo speed below the 102,500 RPM maximum is critical in high-boost racing applications, and the integrated port makes compliance with that limit straightforward. Compatible monitoring systems include the Garrett G-Smart Bluetooth module (PN 923586-0002), the street speed sensor kit with gauge (PN 781328-0001), and the pro kit without gauge (PN 781328-0002), all sold separately.

Turbine Housing Compatibility

The 953234-5001S is a super core only and requires a separate turbine housing to complete the turbocharger assembly. Garrett offers four compatible turbine housing kits for this unit, all featuring T6 inlet and V-band outlet configurations with external wastegate provisions. Available A/R options are 0.96, 1.08, 1.23, and 1.39, with the 1.39 A/R offering a divided inlet option for split pulse exhaust manifold applications. Competitor frame size reference for this unit is the 7688 (76mm inducer / 88mm turbine exducer).

Specifications

Compatible Turbine Kits

What's Included

• 1x Garrett G-XRace GXR47-76 super core assembly (953234-5001S)
• Lightweight aluminum backplate

Frequently Asked Questions

No. The 953234-5001S is a super core only, which includes the CHRA and compressor wheel assembly. A separate turbine housing kit is required to complete the turbocharger. Garrett offers four compatible turbine kits for this unit in A/R options from 0.96 to 1.39.

It is specifically designed for the Ultra Street class, which mandates a 76.6mm compressor inducer maximum. The 953234-5001S meets that specification exactly and is the Garrett-recommended part for this ruleset.

Garrett rates the GXR47-76 at up to 1,700 horsepower based on choke flow of the compressor map. This figure represents total turbo capability and actual supported power depends on engine displacement, fueling, boost levels, and tune.

XBoost refers to Garrett's advanced compressor aerodynamic design that improves efficiency at high flow rates compared to conventional compressor wheels. The practical benefit is a cooler, denser air charge at the compressor outlet, which directly supports more power and more consistent performance across back-to-back passes.

Three options are compatible with the integrated flange-style speed sensor port: the G-Smart Bluetooth module and app (PN 923586-0002), the street speed sensor kit with gauge (PN 781328-0001), and the pro kit without gauge (PN 781328-0002). All are sold separately. Monitoring shaft speed is strongly recommended to protect the turbo from exceeding the 102,500 RPM maximum.

A/R selection depends on engine displacement, target boost, and exhaust manifold configuration. Smaller A/R values like 0.96 spool faster and suit smaller displacement builds, while larger A/R options like 1.23 and 1.39 suit larger engines and higher flow applications. The 1.39 A/R turbine kit includes a divided inlet for split-pulse manifolds.

The GXR47-76 is a racing-focused product designed for drag applications. It can be installed on a street car but is sized for builds pushing well beyond 1,000 horsepower, which requires significant supporting modifications to fuel, cooling, engine internals, and drivetrain. Performance results are highly dependent on the vehicle's full build and calibration.

Garrett specifies a maximum allowable turbocharger speed of 102,500 RPM. Exceeding this limit can cause catastrophic failure of the compressor wheel and bearing assembly. Installing a compatible speed sensor system is the most reliable way to ensure the turbo stays within safe operating limits during high-boost runs.

Installation Overview

• Select a compatible Garrett turbine housing kit based on your engine displacement, target boost, and exhaust manifold configuration before beginning assembly.
• Inspect the super core for shipping damage and verify all components are present before beginning installation.
• Assemble the turbine housing to the super core using the appropriate hardware and torque specifications from the Garrett installation documentation.
• Mount the completed turbocharger assembly to your exhaust manifold using a T6 inlet flange and appropriate hardware.
• Connect compressor outlet to intercooler or charge pipe using a V-band clamp at the compressor outlet.
• Install oil feed and oil drain lines using Garrett-specified fitting sizes and routing to ensure proper oil flow and gravity drain back to the sump.
• Install a compatible speed sensor into the flange-style port on the compressor housing and connect to your chosen monitoring system.
• Prime the oil system and verify oil pressure at the turbo feed line before starting the engine.
• Start the engine and idle to check for oil leaks at all turbo connections before applying boost.
• Break in the turbocharger per Garrett's recommendations before making full-power passes.