The ON3 Performance GT30 55mm Turbocharger is a versatile and proven performance turbo designed for a wide range of street and racing applications. Available with either a Journal Bearing or Ceramic Ball Bearing center section, this turbo delivers fast spool-up, excellent reliability, and outstanding power potential.

Ideal for 1.5L–3.5L single turbo applications as well as twin turbo V8 combinations, the GT30 55mm has become a popular choice for custom builds thanks to its broad operating range and excellent response. Whether you're upgrading a sport compact, building a turbo LS platform, or fabricating a custom twin-turbo system, this turbo offers exceptional value without sacrificing performance.

ON3 Performance has successfully used the GT30 series across numerous in-house projects, producing reliable power in applications ranging from approximately 300 HP to over 500 HP in single turbo setups, while twin turbo combinations have comfortably exceeded 1,000 HP depending on engine configuration and supporting modifications.

Key Features

• Supports up to approximately 525 HP in single turbo applications
• Excellent response and fast boost recovery
• Available in Journal Bearing or Ceramic Ball Bearing
• Choice of Cast or 11-Blade Billet Compressor Wheel
• Multiple compressor cover options
• Traditional T3 exhaust housing or optional Stainless Steel V-Band housing
• 360° thrust bearing for improved durability
• Ideal for custom street, drag race, and road race applications

Available Options

Customize your turbocharger to fit your application:

Compressor Housing

• Compact Cover – 3" inlet / 2" outlet (Standard)
• Anti-Surge Cover – 4" inlet / 2.5" outlet

Bearing System

• Journal Bearing
• Ceramic Ball Bearing

Compressor Wheel

• Cast Wheel
• 11-Blade Billet Wheel

Turbine Housing

• Traditional Cast T3 .63 A/R (Standard)
• Optional .82 A/R Housing
• Optional Stainless Steel V-Band Inlet & Outlet Housing

Turbocharger Specifications

Compressor Side

• Compressor Wheel Inducer: 55mm
• Compressor Inlet: 3.0"
• Compressor Outlet: 2.0"

Turbine Side

• T3 Undivided Turbine Flange
• Standard .63 A/R Housing
• Optional .82 A/R Housing
• Turbine Inducer: 60mm
• Turbine Exducer: 55mm
• 360° Thrust Bearing