The Garrett GTX4508R represents the pinnacle of the GTX-R ball bearing series, engineered for racers who demand maximum horsepower capability without compromise. Built on the proven GTX45 platform with a Compact 42 footprint and divided T4 turbine housing, this unit is purpose-built for extreme power applications where boost response and top-end flow both matter. If your build targets four-digit horsepower numbers, this is the turbocharger designed to get you there.

Specifications

• Compressor Wheel Inducer: 79.8mm
• Compressor Wheel Exducer: 108.0mm
• Compressor Trim: 55 trim
• Turbine Wheel: 87.0mm
• Turbine Trim: 85 trim
• Turbine Housing A/R: 1.01 (Divided T4)
• Bearing Type: Ball Bearing
• Footprint: Compact 42
• HP Capacity: 1400HP

Performance & Application

The GTX4508R is built for extreme racing applications that require both durability and massive flow capacity. Its ball bearing core delivers sharper response and quicker spool characteristics than traditional journal bearing designs, while the divided T4 turbine housing helps maintain exhaust pulse energy for improved efficiency at high power levels. This configuration is engineered to handle significantly increased boost levels compared to earlier GT45 iterations, making it a top choice for builds pushing well beyond standard power ceilings. Enthusiasts building dedicated race engines or extreme street/strip setups will find this turbo capable of supporting their most aggressive power goals.

Frequently Asked Questions

What HP can the GTX4508R support?

This unit is capable of supporting up to 1400HP.

Is this a ball bearing or journal bearing turbocharger?

The GTX4508R is part of Garrett’s ball bearing GTX-R series.

What is the A/R ratio of the turbine housing?

It uses a divided T4 turbine housing with a 1.01 A/R ratio.

What are the compressor and turbine wheel sizes?

The compressor wheel measures 108.0mm exducer by 79.8mm inducer with a 55 trim, while the turbine wheel measures 87.0mm with an 85 trim.

For racers who need proven ball bearing performance capable of handling extreme boost and flowing serious horsepower, the Garrett GTX4508R with its Compact 42 footprint and divided 1.01 A/R T4 housing delivers exactly that capability.