The GTX4718R is a race class-engineered turbocharger built specifically for competition classes that impose an 82mm compressor wheel limit. Designed for drag racing and class-legal builds where every millimeter of compressor sizing matters, this turbo lets serious racers stay within tech inspection rules without sacrificing the performance architecture of Garrett’s proven GT47/GTX47 platform. For teams already running a GT47-based setup, this turbo offers a path to class compliance while retaining external interchangeability with existing hardware.

Specifications

• Compressor Wheel Inducer: 81.8mm
• Compressor Wheel Exducer: 117.6mm
• Compressor Wheel Trim: 48
• Turbine Wheel Inducer: 92.7mm
• Turbine Wheel Exducer: 84mm
• Turbine Wheel Trim: 82
• Garrett P/N: 804878-4

Performance & Application

This turbo is purpose-built for class-legal drag racing and competition applications where compressor wheel size is capped at 82mm. It shares the same compressor and turbine housing style as the GT47 and GTX47 series, making it a natural fit for racers upgrading from or maintaining a GT47-based platform. Because it is externally interchangeable with an existing GT47 turbo setup, teams can integrate this unit into proven chassis and plumbing configurations without redesigning their turbo system. This unit ships without a turbine housing, giving racers the flexibility to select the housing that matches their specific class rules and power targets.

Compatibility & Fitment

• Matches GT47/GTX47 housing compatibility
• Externally interchangeable with an existing GT47 turbo setup

Frequently Asked Questions

Does the GTX4718R include a turbine housing?

No, this turbo is sold without a turbine housing. The turbine housing must be purchased separately.

Why does the GTX4718R use an 81.8mm inducer instead of a standard GT47/GTX47 compressor wheel?

This turbo is built for class requirements that are limited to an 82mm compressor wheel, so the 81.8mm inducer size is specifically designed to meet that competition restriction.

Can the GTX4718R be installed on an existing GT47 turbo setup?

Yes, it is externally interchangeable with an existing GT47 turbo setup and shares the same compressor and turbine housing style as the GT47/GTX47.

What is the turbine wheel trim on the GTX4718R?

The turbine wheel trim is 82, with a 92.7mm inducer and 84mm exducer.

For competitors who need to stay within an 82mm compressor wheel class limit without abandoning their GT47/GTX47 platform investment, the GTX4718R delivers the exact specification required for tech-legal, podium-ready builds.