Garrett GTW3476JB (aka GTW5857JB) – 58mm JB Turbo, .63 A/R, T3 Inlet, T31(NARROW) 4 BOLT EXIT

The Garrett GTW3476JB is a 58mm journal bearing turbocharger built for enthusiasts who want strong mid-range spool without sacrificing top-end flow. Designed as Garrett’s GTW-series answer to the popular 5858 turbo size, it delivers serious performance at a price point that makes sense for street and strip builds alike. This is the turbo for builders who want proven Garrett engineering without paying for features they don’t need.

Specifications

• Compressor Wheel Inducer: 58.3mm
• Compressor Wheel Exducer: 76.4mm
• Compressor Wheel Trim: 58
• Turbine Wheel Inducer: 65.0mm
• Turbine Wheel Exducer: 56.6mm
• Turbine Wheel Trim: 76
• A/R Ratio: .63
• Compressor Inlet: T3 Undivided Inlet
• Turbine Housing Outlet: Narrow T31 4 Bolt Exit
• Bearing Type: Journal Bearing
• HP Potential: 700HP
• Garrett P/N: GTW3476JB
• Also Known As: GTW5857JB

Performance & Application

The GTW3476JB is engineered for builds targeting up to 700 horsepower, making it a strong fit for high-performance street and track applications. Its journal bearing design paired with the .63 A/R turbine housing and T3 undivided inlet is tuned to deliver strong mid-range spool while still supporting peak flow at the top of the power band. The narrow T31 four-bolt outlet keeps the turbine housing compact and application-specific for builders working within GTW3476 T3 housing setups. This turbo suits enthusiasts looking for a Garrett-engineered alternative to the traditional 5858-size turbo without the added cost of ball bearing technology.

Frequently Asked Questions

What HP can the GTW3476JB support?

The GTW3476JB has a 700HP potential flow rating.

Is the GTW3476JB a ball bearing or journal bearing turbo?

The GTW3476JB is a 58mm journal bearing turbocharger.

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

It comes with a .63 A/R turbine housing featuring a T3 undivided inlet and a narrow T31 four-bolt outlet.

What does GTW5857JB refer to?

GTW5857JB is an alternate name for the Garrett GTW3476JB.

For builders seeking Garrett’s GTW-series performance and reliability in a 58mm journal bearing package, the GTW3476JB delivers proven flow characteristics at a competitive price point.