Garrett G35-990 G-Series II Supercore grt934123-5001S

Take your turbocharged performance build to the next level with the Garrett G35-990 G-Series II Supercore, a high-performance turbocharger assembly engineered for enthusiasts and motorsport applications requiring increased airflow, improved efficiency, and substantial horsepower capability.

Part of Garrett Motion's advanced G-Series II lineup, the G35-990 incorporates updated compressor aerodynamics designed to deliver improved performance over the previous-generation G-Series platform. With a manufacturer-rated horsepower range of 550–990 HP and a recommended engine displacement range of 2.0L–5.5L, this turbocharger offers a versatile foundation for high-output engine builds.

The G-Series II compressor design delivers up to 10% higher compressor flow compared with G-Series Gen I at peak pressure ratio and turbocharger speed. Increased efficiency at higher flow rates helps support demanding performance applications, while the updated turbine wheel aerodynamics contribute to improved exhaust flow and boost response.

The G35-990 features a durable Mar-M alloy turbine wheel rated for temperatures up to 1050°C. Its advanced rotating assembly incorporates twin piston rings on both sides of the shaft wheel assembly to help reduce the likelihood of oil leakage through the sealing areas.

Designed with upgrade flexibility in mind, the G-Series II platform utilizes compatible first-generation G-Series compressor and turbine housings, providing an upgrade path for existing Garrett G-Series owners.

Important: This product is a Supercore assembly, not a complete turbocharger with turbine housing. A compatible turbine housing and supporting installation components must be selected separately.

Key Features

• Brand: Garrett Motion

• Product: G35-990 G-Series II Supercore

• Horsepower Rating: 550–990 HP

• Recommended Engine Displacement: 2.0L–5.5L

• Advanced G-Series II compressor aerodynamics.

• Up to 10% higher compressor flow compared with G-Series Gen I under specified peak operating conditions.

• Improved efficiency at high airflow rates.

• Updated turbine wheel design for improved flow and response.

• Mar-M alloy turbine wheel rated up to 1050°C.

• Twin piston ring design on both sides of the shaft wheel assembly.

• Compatible with applicable first-generation G-Series compressor and turbine housings.

• Standard and reverse rotation configurations available.

• Designed for high-performance turbocharged engine applications.

• Supports custom turbocharger configurations using compatible turbine housings.

• Oil restrictor and water fittings included according to Garrett's product specifications.

• Professional installation and appropriate ECU calibration recommended.

Technical Specifications

• Turbocharger Series: Garrett G-Series II

• Model: G35-990

• Product Configuration: Supercore

• Horsepower Range: 550–990 HP

• Engine Displacement Range: 2.0L–5.5L

• Compressor Inducer: 62 mm

• Compressor Exducer: 76 mm

• Compressor Trim: 65

• Compressor A/R: 0.72

• Turbine Inducer: 68 mm

• Turbine Exducer: 62 mm

• Turbine Trim: 84

• Turbine Wheel Material: Mar-M alloy

• Turbine Wheel Temperature Rating: Up to 1050°C

• Maximum Allowable Turbocharger Speed: 140,000 RPM

• Rotation Options: Standard Rotation / Reverse Rotation

Manufacturer Part Numbers

• Standard Rotation Supercore: 934123-5001S

• Reverse Rotation Supercore: 934126-5001S

Confirm the required rotation direction and exact part number before ordering.

Fitment

Universal / Custom Turbocharged Applications

Recommended Engine Displacement: 2.0L–5.5L

The Garrett G35-990 G-Series II Supercore is intended for compatible custom turbocharger installations rather than a specific direct-fit vehicle application.

Fitment Note: Compatibility depends on the selected turbine housing, turbocharger orientation, exhaust manifold, intake plumbing, oil and coolant connections, engine configuration, and supporting modifications.

Installation & Compatibility Notes

• This listing is for the Supercore configuration.

• A compatible turbine housing must be selected separately.

• Confirm whether standard or reverse rotation is required.

• Verify compatibility with the intended compressor and turbine housing configuration.

• Ensure the engine's oil supply, oil drainage, and coolant connections meet Garrett's installation requirements.

• Appropriate supporting fuel system components, intake plumbing, exhaust components, and ECU calibration may be required.

• Professional installation by an experienced turbocharger specialist is recommended.

• Proper tuning is necessary to take advantage of the increased airflow capability.

• Actual horsepower output depends on engine configuration, fuel, calibration, boost pressure, and supporting hardware.

Important Operating & Safety Information

Maximum Turbocharger Speed: 140,000 RPM

Operating beyond Garrett's specified maximum turbocharger speed can result in premature failure or turbocharger damage. A compatible turbocharger speed sensor may be used to monitor shaft speed and help prevent overspeed conditions.

Always follow Garrett Motion's installation, lubrication, cooling, and operating requirements.