Garrett Boost | Club Line GBC37-900 67mm Turbocharger

Garrett Boost | Club Line GBC37-900 67mm Turbocharger — Select Turbine Housing

Part Number: 913840-5002S

The Garrett Boost | Club Line GBC37-900 is a standard-rotation, journal-bearing turbocharger platform rated by Garrett for 450–900 horsepower and 2.0- to 5.5-liter engine applications. Its 67/84 mm forged and fully machined compressor wheel is paired with a 73/65 mm Inconel turbine wheel, providing substantial airflow in a comparatively affordable, serviceable package.

The GBC37-900 uses GTX Gen II-derived compressor aerodynamics, an extended-tip compressor-wheel design, a modern gasoline-performance turbine stage, and Garrett’s latest-generation journal-bearing rotating group with a 360-degree thrust bearing. Garrett publishes compressor capability of up to approximately 87 lb/min and a pressure ratio of up to 4.0.

This product is configured by selecting one of three compatible genuine Garrett turbine-housing kits. Available configurations include 0.82 A/R open T3, 0.82 A/R open T4, and 0.95 A/R divided T4 turbine housings. Each housing uses a 90 mm / 3.5-inch V-band turbine outlet and requires an external wastegate.

A supercore-only option is also available for customers who already have a compatible standard-rotation Garrett GBC37 turbine housing. The 0.82 A/R open T4 housing is the recommended RAD default for conventional non-divided T4 exhaust manifolds.

Key Features

• Garrett-rated 450–900 horsepower range
• Garrett reference displacement range of 2.0–5.5 liters
• 67 mm compressor-wheel inducer and 84 mm exducer
• 73 mm turbine-wheel inducer and 65 mm exducer
• Forged and fully machined billet compressor wheel
• Extended-tip compressor-wheel design
• GTX Gen II-derived compressor aerodynamics
• Up to approximately 87 lb/min published compressor flow
• Up to 4.0 published compressor pressure ratio
• Latest-generation journal-bearing rotating group
• 360-degree thrust bearing
• Inconel turbine wheel
• Ductile-iron SiMo+ turbine-housing construction
• Oil-cooled center housing
• Machined compressor-cover boost-reference port with installed plug
• Open T3, open T4, and divided T4 turbine-housing options
• External-wastegate configuration
• 90 mm / 3.5-inch V-band turbine outlet
• Outline interchangeable with the Garrett GBC35-700 for supported stage-change applications

Kit Includes

• 913840-5002S — Garrett GBC37-900 standard-rotation supercore
• Selected Garrett GBC37 turbine-housing kit when a housed configuration is ordered
• Garrett turbine-housing connection components and gasket kit supplied with the selected turbine kit
• Installed compressor-cover boost-reference-port plug

Technical Specifications

Compressor

• Compressor-wheel inducer: 67 mm
• Compressor-wheel exducer: 84 mm
• Compressor-wheel trim: 64
• Compressor-housing A/R: 0.72
• Compressor inlet: 101.6 mm / 4.00-inch hose connection
• Compressor outlet: 63.5 mm / 2.50-inch hose connection
• Compressor-wheel construction: Forged and fully machined aluminum
• Compressor technology: Extended-tip design with GTX Gen II-derived aerodynamics
• Published maximum compressor flow: Approximately 87 lb/min
• Published maximum pressure ratio: Approximately 4.0
• Boost-reference provision: Machined port with installed plug

Turbine

• Turbine-wheel inducer: 73 mm
• Turbine-wheel exducer: 65 mm
• Turbine-wheel trim: 80
• Turbine-wheel material: Inconel
• Turbine-housing material: Ductile iron, SiMo+
• Turbine-inlet options: Open T3, open T4, or divided T4
• Turbine outlet: 90 mm / 3.5-inch V-band
• Wastegate configuration: External wastegate required
• Rotation: Standard / clockwise

Bearing Housing and Lubrication

• Bearing system: Journal bearing
• Thrust bearing: 360-degree
• Center-housing cooling: Engine oil
• Water cooling: Not used
• Oil-feed and oil-drain fittings: Application specific and sold separately

Available Turbine Housings

• 740902-0127 — 0.82 A/R, open T4 inlet, 90 mm V-band outlet, external wastegate — Recommended RAD default
• 740902-0126 — 0.82 A/R, open T3 inlet, 90 mm V-band outlet, external wastegate
• 740902-0128 — 0.95 A/R, divided T4 inlet, 90 mm V-band outlet, external wastegate
• Supercore Only — No turbine housing

Application Notes

• The 0.82 A/R open T4 housing is the recommended default for conventional non-divided T4 exhaust manifolds.
• The 0.82 A/R open T3 housing provides the same nominal A/R with a T3 inlet footprint.
• The 0.95 A/R divided T4 housing is intended for a properly divided manifold that preserves exhaust-pulse separation to the turbine inlet.
• A divided housing should not be selected solely on the assumption that twin-scroll construction is inherently superior.
• All three listed turbine housings are externally wastegated and require a separate wastegate, wastegate springs, boost-control plumbing, and any electronic boost-control hardware.
• Every housed configuration uses Garrett supercore part number 913840-5002S.
• The selected turbine kit includes the housing connection components and gasket kit supplied by Garrett; mating exhaust-manifold and downpipe flanges are not included.
• The turbine-outlet weld flange and V-band clamp are not included.
• The turbine-inlet gasket or weld flange, as applicable, is not included unless specifically added to the order.
• Oil-feed fitting, oil-feed line, oil-drain fitting, oil-drain flange, and oil-drain line are not included.
• External wastegate, intake plumbing, charge piping, intercooler, exhaust manifold, downpipe, heat-management components, and application-specific installation hardware are not included.
• This is an oil-cooled journal-bearing turbocharger; no coolant plumbing is required.
• This is a universal performance turbocharger and is not supplied as a vehicle-specific installation kit.
• Garrett’s horsepower rating represents potential flywheel horsepower calculated from compressor-map choke flow. Actual output depends on engine airflow, fuel, boost pressure, exhaust backpressure, engine speed, intercooling, and tune.
• Final turbocharger and turbine-housing selection should account for engine displacement, intended power, torque target, exhaust-manifold design, duty cycle, packaging, and desired response.

Emissions and Competition-Use Notice

Unless specifically identified as emissions-legal for the applicable vehicle and application, this product is intended for sanctioned competition, off-road, or other non-emissions-controlled use. Installation or use on an emissions-controlled vehicle operated on public roads may violate federal, state, or local law. The purchaser and installer are responsible for confirming and maintaining compliance with all applicable emissions and vehicle-use regulations.