The GTX4708R 49 Trim is a purpose-built race compressor engineered for drag racing classes that cap compressor wheel size at 76mm. It’s designed for teams and engine builders working within strict class rules who still demand Garrett’s GTX-series performance and reliability. This turbo bolts into existing GT47 platforms, making it the logical upgrade path for racers already running GT47 hardware.

Specifications

• Compressor Wheel Inducer: 75.8mm
• Compressor Wheel Exducer: 108.0mm
• Compressor Wheel Trim: 49
• Turbine Wheel Inducer: 92.7mm
• Turbine Wheel Exducer: 84mm
• Turbine Wheel Trim: 82
• Garrett P/N: 804878-3

Performance & Application

This GTX4708R variant is purpose-built for drag race classes with a hard limit on compressor wheel diameter, giving racers a way to maximize output while staying within the 76mm compressor wheel rule. The compressor housing shares the same style as the standard GT47, so it carries over the aerodynamic behavior and housing compatibility racers already know. Because the turbine side mates to any GT47 series turbine housing, builders can select the exact housing configuration needed to match their engine and track strategy. This unit ships without a turbine housing, allowing full flexibility in turbine housing selection for class compliance or specific spool/top-end characteristics.

Compatibility & Fitment

• Turbine side mates to any GT47 series turbine housing
• Externally interchangeable with an existing GT47 turbo setup
• Built for class requirements limited to a 76mm compressor wheel

Frequently Asked Questions

Does this turbo include a turbine housing?

No. This GTX4708R is sold without a turbine housing; the turbine housing must be purchased separately.

What turbine housings fit this turbo?

The turbine side of this turbo will mate to any GT47 series turbine housing.

Can I use this to upgrade an existing GT47 setup?

Yes. It is externally interchangeable with an existing GT47 turbo setup, and the compressor housing shares the same style as the GT47.

Why does this turbo use a 49 trim, 75.8mm inducer compressor wheel?

This turbo is built specifically for race class requirements that are limited to a 76mm compressor wheel.

For racers locked into a 76mm compressor wheel class limit, the GTX4708R 49 Trim delivers Garrett-engineered performance without compromising class legality or GT47 compatibility.