Turbocharger Garrett GT4508R 108mm (80mm) w/ Compact 42, DIVIDED 1.28 AR T4

The Garrett GT4508R is a high-capacity ball bearing turbocharger engineered for extreme power builds that demand massive airflow without sacrificing response. Built around a compact 42 footprint and a divided T4 turbine housing, this unit is the choice for serious enthusiasts and race applications pushing well beyond stock turbo limits. It’s designed for builders who need top-end power without compromise.

Specifications

• Compressor Wheel Exducer: 108.0mm
• Compressor Wheel Inducer: 79.8mm
• Compressor Trim: 55 trim
• Turbine Wheel: 87.0mm
• Turbine Trim: 85 trim
• A/R Ratio: 1.28 Divided
• Turbine Housing Flange: T4
• Footprint: Compact 42
• Bearing Type: Ball Bearing
• HP Capacity: Approximately 1200 HP
• Garrett P/N: 880704-5004S

Performance & Application

The GT4508R is built for high-horsepower applications where sustained top-end airflow and durability under extreme boost are non-negotiable. Its ball bearing core enables quicker spool response than traditional journal bearing designs of similar size, while the divided T4 turbine housing helps maintain exhaust pulse energy for improved turbine efficiency. This turbocharger is suited for builders targeting extreme power levels who require a large-frame turbo capable of supporting big power without the compressor or turbine becoming a bottleneck. It’s a strong fit for dedicated high-boost, high-output engine builds.

Frequently Asked Questions

How much horsepower can the Garrett GT4508R support?

The GT4508R is capable of approximately 1200 HP.

Is the GT4508R a ball bearing or journal bearing turbocharger?

The GT4508R features ball bearing construction, which ensures rapid spool response on extreme power builds.

What is the A/R ratio and turbine housing configuration on the GT4508R?

The GT4508R uses a 1.28 A/R divided T4 turbine housing.

What size compressor and turbine wheels does the GT4508R use?

The GT4508R features a 108.0mm exducer / 79.8mm inducer compressor wheel with 55 trim, paired with an 87.0mm turbine wheel with 85 trim.

For builders chasing serious four-digit horsepower numbers, the Garrett GT4508R delivers the airflow, boost response, and durability needed to get there without compromise.