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Externally Wastegated T4 Divided Turbine Housing for G38 and GXR38 Builds
The Garrett G38/GXR38 Turbine Housing Kit T4 Divided / V-Band 0.85 A/R (GRT757707-0042) is a stainless steel exhaust housing engineered for use with Garrett’s G38-1000 G-Series II and G-XRace GXR38-64 supercores in applications demanding T4 divided manifold compatibility and V-Band turbine outlet. The 0.85 A/R ratio on GRT757707-0042 provides the quickest spool response in the G38 turbine housing family, making it the preferred choice for 2.0L to 4.0L builds where low-RPM boost response and mid-range power delivery are priorities. The T4 divided (twin-scroll) inlet design preserves exhaust gas pulse separation from the manifold for improved turbo response across the RPM range.
Key Features
- GRT757707-0042 turbine housing for G38-1000 (938272-5003S) and GXR38-64 (934173-5008S / 934173-5009S) supercores
- T4 divided inlet flange for twin-scroll exhaust manifold compatibility and improved spool response
- V-Band turbine outlet for exhaust connection to downpipe or mid-pipe
- 0.85 A/R ratio provides fastest spool in the G38 family for responsive lower-displacement builds
- Stainless steel construction for sustained high-temperature race use
- External wastegate only (no internal wastegate) for maximum boost control precision
- Includes gasket kit, V-Band clamp, and mounting hardware
Specifications
| Detail | Value |
|---|---|
| Part Number | GRT757707-0042 / 757707-0042 |
| Compatible Supercores | G38-1000 (938272-5003S), GXR38-64 (934173-5008S, 934173-5009S) |
| Turbine Inlet | T4 Divided (twin-scroll) |
| Turbine Outlet | V-Band |
| A/R Ratio | 0.85 |
| Wastegate Type | External only |
| Housing Material | Stainless steel |
| UPC | Verify with Garrett distributor |
What’s Included
- 1 x GRT757707-0042 G38/GXR38 Turbine Housing
- Gasket kit
- V-Band clamp for turbine outlet
- Mounting hardware
- Note: Supercore sold separately
About Garrett Motion
Garrett Motion designs and manufactures turbine housing kits to precise tolerance specifications developed through decades of motorsport and OEM engineering. The G38 turbine housing family offers three A/R options and two inlet configurations to optimize turbo performance for specific engine displacement and power target combinations.
FAQ
What is the GRT757707-0042?The GRT757707-0042 is a stainless steel turbine housing kit for Garrett G38 and GXR38 supercores, featuring a T4 divided (twin-scroll) inlet and V-Band outlet with a 0.85 A/R ratio. It is sold as a standalone housing kit and requires a compatible G38 or GXR38 supercore to complete the turbocharger assembly.
Which supercores are compatible with GRT757707-0042?GRT757707-0042 is compatible with the G38-1000 supercore (GRT938272-5003S) and the G-XRace GXR38-64 supercores (GRT934173-5008S and GRT934173-5009S). All supercores are sold separately.
What is the difference between 0.85, 0.95, and 1.06 A/R for the G38?The 0.85 A/R (GRT757707-0042) provides the fastest spool and best low-RPM response, suited for smaller displacement engines or builds where response time is critical. The 0.95 A/R (GRT757707-0043) balances response and peak flow. The 1.06 A/R (GRT757707-0044) flows the most exhaust gas and suits high-RPM power builds on larger engines.
Does GRT757707-0042 work with an internal wastegate?No. All G38 series turbine housing kits are designed for external wastegate use only. An internal wastegate actuator is not available for this housing family.
Is a V-Band clamp included?Yes. GRT757707-0042 includes a V-Band clamp for the turbine outlet, gasket kit, and mounting hardware. Weld flanges for the downpipe connection are not included.
Can I use GRT757707-0042 on a 2.0L engine?Yes. The 0.85 A/R T4 divided housing is well suited to 2.0L to 3.5L engine applications where fast spool and mid-range torque are the primary goals. For high-RPM, large-displacement builds, the 0.95 or 1.06 A/R options may be more appropriate.
Are G38 turbine housings interchangeable with G40 or G42 housings?No. G38 turbine housings are specific to the G38 frame and are not interchangeable with G40, G42, or other Garrett G-Series frames. Always verify the supercore frame size before purchasing a housing kit.
What rotation is GRT757707-0042?GRT757707-0042 is standard rotation. Reverse-rotation housings are separate part numbers and are not compatible with standard-rotation supercores.
Installation Overview
- Verify the G38 or GXR38 supercore is properly prepared with oil and coolant fittings installed
- Align the turbine housing T4 divided inlet to the exhaust manifold T4 flange and bolt in place using the supplied hardware
- Torque housing fasteners to Garrett specification to prevent leaks under thermal expansion
- Connect the V-Band turbine outlet to the downpipe using the included V-Band clamp and an appropriate downpipe V-Band flange
- Route the external wastegate dump port to your downpipe or dump tube
- Complete supercore oil and coolant line connections before first startup
- Allow initial idle period for oil circulation before operating under boost
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