The Garrett Supercore G-Series II G42-1585 delivers the power of legends with the durability of champions, built for enthusiasts and professional builders who demand a proven upgrade path without compromise. This supercore leverages new compressor aero technology to unlock greater performance while retaining compatibility with existing Gen I hardware, making it the direct route forward for anyone already running a G-Series turbo. Whether you’re stepping up from a complete turbo unit, a supercore, or a standalone CHRA, this is the calibrated evolution built to push your platform further.

Specifications

• Compatible Housings: G-Series II utilizes Gen I compressor and turbine housings
• Compressor Flow Improvement: Up to 10% higher compressor flow compared to G-Series Gen I at peak pressure ratio and peak turbo RPM
• Rotation Configurations: Standard and reverse rotation configurations available
• Turbine Wheel Material: Mar-M alloy, rated up to 1050° C
• Turbine Housing Material: Stainless steel, rated up to 1050° C
• Compatible Speed Sensor Kit: ATP-ACS-032
• Garrett P/N: 938339-5003S

Performance & Application

Engineered as a calibrated upgrade for existing G-Series Gen I platforms, this supercore is designed for builders seeking increased efficiency at high flow rates without abandoning their current housing investment. The updated compressor aero technology is built to extract meaningfully more flow at peak pressure ratio and peak turbo RPM, translating into a real horsepower upgrade once properly calibrated. With both standard and reverse rotation configurations available, it adapts to a wide range of engine layouts and turbo system designs. This is the choice for performance builds that demand higher output while maintaining proven durability under extreme thermal conditions.

Frequently Asked Questions

How much more flow does the G-Series II offer compared to Gen I?

The G-Series II delivers up to 10% higher compressor flow compared to G-Series Gen I at peak pressure ratio and peak turbo RPM.

Do I need to do anything to take advantage of the increased flow?

Yes, calibration is required to take advantage of the increased flow for a horsepower upgrade.

Can this supercore be used with my existing Gen I housings?

Yes, G-Series II utilizes Gen I compressor and turbine housings, making it a direct upgrade path for Gen I customers as a complete turbo unit, supercore, or CHRA purchase.

What temperature is the turbine wheel

Downloads

• Garrett-G-Series-II-Product Flyer G40 42 45