The Garrett GT4508R is a large-frame turbocharger built for extreme boost applications and high-horsepower builds where massive top-end airflow is the priority. Its compact 42 footprint and divided T4 turbine housing make it a serious choice for enthusiasts chasing four-digit horsepower without sacrificing housing compatibility. This is a turbo for builders who know exactly what they’re aiming for and need a component engineered to get them there.

Specifications

• Compressor Wheel Inducer: 79.8mm
• Compressor Wheel Exducer: 108.0mm
• Compressor Trim: 55
• Turbine Wheel: 87.0mm
• Turbine Trim: 85
• A/R Ratio: 1.01 Divided
• Turbine Housing Flange: T4
• Footprint: Compact 42
• HP Capacity: ~1200 HP

Performance & Application

The GT4508R is designed for extreme boost applications where sustained high-horsepower output is the goal. With its 108mm/80mm compressor wheel paired to an 87mm turbine wheel, this turbo is built to move serious air for builds targeting the upper limits of horsepower. The 1.01 A/R divided T4 turbine housing helps manage exhaust pulse separation for improved efficiency in high-output setups, while the compact 42 footprint keeps the unit’s turbine housing dimensions manageable relative to its massive flow potential. This is a top-end power turbo suited to dedicated high-horsepower platforms rather than daily-driven or stock-displacement applications.

Frequently Asked Questions

What horsepower can the Garrett GT4508R support?

The GT4508R is capable of approximately 1200 HP.

What is the A/R ratio on this turbine housing?

This turbo uses a 1.01 A/R divided T4 turbine housing.

What size is the compressor wheel?

The compressor wheel measures 108.0mm exducer / 79.8mm inducer with a 55 trim.

What size is the turbine wheel?

The turbine wheel measures 87.0mm with an 85 trim.

For builders targeting extreme, high-horsepower output with a proven Garrett large-frame platform, the GT4508R delivers the flow capacity and turbine housing configuration needed to get there.