The Garrett G42-1585 CHRA represents the next evolution of the proven G-Series platform, built for enthusiasts and tuners who demand more from their existing G-Series Gen I setup without starting from scratch. Engineered with new compressor aero technology, this CHRA is the direct path to more power for anyone running Gen I housings today. Whether you’re building a complete turbo, upgrading a supercore, or simply swapping in a new CHRA, this is the core that unlocks the next level of performance.
Specifications
- Model: G42-1585
- Garrett P/N: 938338-5003S
- Compressor Flow: Up to 10% higher compressor flow compared to G-Series Gen I at peak pressure ratio and peak turbo RPM
- Turbine Wheel Material: Mar-M alloy
- Turbine Wheel Temperature Rating: Rated up to 1050° C
- Turbine Housing Material: Stainless steel
- Turbine Housing Temperature Rating: Rated up to 1050° C
- Rotation Configuration: Standard and reverse rotation configurations available
- Housing Compatibility: Utilizes Gen I compressor and turbine housings
- Compatible Speed Sensor Kit: ATP-ACS-032
Performance & Application
The G42-1585 CHRA is purpose-built for existing G-Series Gen I owners looking to extract more performance from their current housing setup. With increased efficiency at high flow rates and higher peak compressor flow compared to Gen I, this CHRA is calibrated to reward builds pushing toward the upper end of their power envelope. The Mar-M alloy turbine wheel and stainless steel turbine housing are engineered to withstand sustained high-temperature operation, making this a serious option for high-output, high-heat applications. Calibration is required to fully realize the horsepower gains this increased flow capability enables.
Frequently Asked Questions
- Is the G42-1585 CHRA compatible with my existing Gen I G-Series turbo?
- Yes. G-Series II utilizes Gen I compressor and turbine housings, and the G42-1585 CHRA is offered as a direct upgrade path for Gen I customers as a complete turbo unit, supercore, or CHRA purchase.
- How much more airflow does the G42-1585 offer compared to Gen I?
- The G42-1585 delivers up to 10% higher compressor flow compared to G-Series Gen I at peak pressure ratio and peak turbo RPM.
- What is the turbine wheel made from and what temperature can it handle?
- The turbine wheel is made from Mar-M alloy and is rated up to 1050° C.
- Do I need to recalibrate after installing this CHRA?
- Yes, calibration is required to take advantage of the increased flow for a horsepower upgrade.
For Gen I G-Series owners seeking a meaningful, credible step up in flow and efficiency without abandoning their existing housing investment, the Garrett G42-1585 CHRA delivers exactly that upgrade path.
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