The Garrett GTW3684JB is a purpose-built journal bearing turbocharger from Garrett’s GTW Series, engineered as the performance answer to the popular 6262-size frame. Built for enthusiasts who want serious power without paying ball-bearing prices, this turbo is available with a wide range of turbine housing configurations so you can dial in the exact spool and flow characteristics your build demands. It’s the turbo of choice for those chasing big horsepower gains on a budget-conscious platform without sacrificing Garrett engineering.

Specifications

• Compressor Wheel Inducer: 62.3mm
• Compressor Wheel Exducer: 84.4mm
• Compressor Wheel Trim: 54
• Turbine Wheel Inducer: 71.0mm
• Turbine Wheel Exducer: 61.9mm
• Turbine Wheel Trim: 76
• Bearing Type: Journal Bearing
• HP Potential: Up to 750HP
• Compressor Housing: T04S Frame with 4″ inlet, 2.5″ outlet, and built-in & machined anti-surge
• Compressor Housing Option: T04S (4″ Inlet, 2.5″ Outlet) with machined anti-surge
• Turbine Housing A/R Option: .63 A/R (Available in T3 Inlet; 4 Bolt, or V-band Outlet)
• Turbine Housing A/R Option: .82 A/R (Available in T3 Inlet; 4 Bolt, 5 Bolt Ford Style, or V-band Outlet)
• Turbine Housing A/R Option: .82 A/R (Available in ATP Stainless V-Band, Tial Compatible)
• Turbine Housing A/R Option: 1.08 A/R (Available in T3 Non-Divided Inlet; V-band 2.5″ or 3.0″ Outlet)
• Turbine Housing A/R Option: 1.16 A/R (Available in T3 Divided Inlet; 4 Bolt, 3″ Outlet)
• Turbine Housing A/R Option: 1.16 A/R (Available in T3 Divided Inlet; and 3″ V-band Outlet Adapter)
• Turbine Housing A/R Option: 1.15 A/R (Available in T4 Divided Inlet; V-band 3″ Outlet)
• Turbine Housing A/R Option: .70 A/R (Available in T4 Divided Inlet; V-band 3″ Outlet)
• Turbine Housing Configuration: T3 Inlet, 4 Bolt Outlet (2.5″)
• Turbine Housing Configuration: T3 Inlet, V-Band Outlet (2.5″)
• Turbine Housing Configuration: T3 Inlet, 5 Bolt (Ford Style) Outlet (Available only in .82 A/R)
• Turbine Housing Configuration: T3 Divided Inlet, 4 Bolt Outlet (3.0″) — Available in 1.16 A/R Only
• Turbine Housing Configuration: T3 Divided Inlet, V-Band Outlet Adapter (3.0″) — Available in 1.16 A/R Only
• Turbine Housing Configuration: T3 Non-Divided Inlet, machined V-Band Outlet (2.5″) — Available in 1.08 A/R Only
• Turbine Housing Configuration: T3 Non-Divided Inlet, welded V-Band Outlet (GT 3.0″) — Available in .63, .82, or 1.08 A/R
• Turbine Housing Configuration: Stainless (Tial Compatible) V-Band In/Out — Only .82 A/R Available
• Turbine Housing Configuration: T4 Divided Inlet, V-Band Outlet (3.0″)
• Garrett P/N: GTW3684JB
• Also Known As: GTW6262JB

Performance & Application

Designed around the widely-used 6262 frame size, the GTW3684JB delivers strong flow capability for enthusiasts building serious horsepower on a journal bearing platform. Its selectable turbine housing lineup — spanning multiple A/R ratios, inlet styles, and outlet configurations — allows this core to be tailored for both divided and non-divided exhaust manifold setups, giving builders flexibility across a range of response and top-end flow priorities. The integrated anti-surge compressor housing design supports stable, efficient boost delivery, making this a versatile choice for high-output builds seeking Garrett-level performance at a more accessible price point.

Frequently Asked Questions

What HP can the GTW3684JB support?

The GTW3684JB has a flow potential of up to 750HP.

Is this a ball bearing or journal bearing turbo?

The GTW3684JB is a journal bearing turbocharger.

What does GTW6262JB refer to?