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Balanced Spool and Flow T4 Divided Turbine Housing for G38 and GXR38 Platforms
The Garrett G38/GXR38 Turbine Housing Kit T4 Divided / V-Band 0.95 A/R (GRT757707-0043) is the midrange A/R option in the G38 turbine housing family, delivering the optimal balance of spool response and peak exhaust flow for builds targeting 600 to 900 horsepower across a broad engine displacement range. The T4 divided twin-scroll inlet on GRT757707-0043 preserves exhaust pulse energy from the manifold to improve low and mid-RPM turbo response, while the V-Band turbine outlet simplifies downpipe connections in custom fabricated exhaust systems. The 0.95 A/R housing is the most versatile selection for G38 builds spanning 2.5L to 5.5L applications where both response and top-end flow capability are valued equally.
Key Features
- GRT757707-0043 turbine housing for G38-1000 and GXR38-64 supercores with T4 divided inlet and V-Band outlet
- 0.95 A/R ratio balances spool response and peak exhaust flow for broad RPM range power delivery
- T4 divided twin-scroll inlet for pulse energy retention and improved low-RPM spool characteristics
- V-Band turbine outlet for straightforward downpipe or midpipe connection
- Stainless steel housing for sustained thermal durability in race and high-boost street applications
- External wastegate design for precise boost pressure management
- Includes gasket kit, V-Band clamp, and mounting hardware
Specifications
| Detail | Value |
|---|---|
| Part Number | GRT757707-0043 / 757707-0043 |
| 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 | 0.95 |
| Wastegate Type | External only |
| Housing Material | Stainless steel |
| UPC | Verify with Garrett distributor |
What’s Included
- 1 x GRT757707-0043 G38/GXR38 Turbine Housing Kit
- Gasket kit
- V-Band clamp for turbine outlet
- Mounting hardware
- Note: Supercore sold separately
About Garrett Motion
Garrett Motion provides the complete G38 turbine housing family across three A/R ratios and two inlet configurations to precisely match the housing to the engine, power target, and exhaust manifold design. The GRT757707-0043 represents the most commonly specified G38 housing for builds targeting a wide RPM power band.
FAQ
What is the GRT757707-0043?The GRT757707-0043 is a Garrett G38/GXR38 stainless steel turbine housing with T4 divided inlet, V-Band outlet, and 0.95 A/R ratio. It is compatible with the G38-1000 and GXR38-64 supercores and sold as a standalone kit requiring a separate supercore purchase to complete the turbocharger.
How does 0.95 A/R compare to 0.85 and 1.06 for the G38?The 0.95 A/R on GRT757707-0043 sits between the quickest-spool 0.85 A/R (GRT757707-0042) and the highest-flow 1.06 A/R (GRT757707-0044). It is the most balanced choice for builds spanning 3.0L to 5.0L engines where both spool and top-end output matter, and is typically the most popular selection for dual-purpose street and track builds.
What displacement engines work best with GRT757707-0043?The 0.95 A/R housing performs well across 2.5L to 5.5L displacements. It is particularly well matched to 4-cylinder 2.5L to 3.5L builds where moderate response with strong peak flow is desired, and to 6-cylinder applications in the 400 to 800 horsepower range.
Does GRT757707-0043 require an external wastegate?Yes. All G38 turbine housing kits are external wastegate only. An external wastegate appropriate for your boost level must be sourced separately.
Is the T4 divided inlet the same bolt pattern as a standard T4 flange?The T4 divided inlet uses the standard T4 bolt pattern with a divided (twin-scroll) internal divider. The manifold must also be a divided T4 design with internal scroll separation to benefit from the twin-scroll pulse energy. A standard undivided T4 manifold can physically bolt up but will not provide twin-scroll benefit.
Are G38 housings cross-compatible with G40 or G42 supercores?No. The G38 turbine housing family is frame-specific and cannot be used on G40, G42, or other Garrett frame supercores. Confirm the supercore part number is a G38 or GXR38 before purchasing GRT757707-0043.
What is included in the kit?GRT757707-0043 includes the turbine housing, gasket kit, V-Band clamp for the turbine outlet, and mounting hardware. Weld flanges for the downpipe are not included.
Does this housing include wastegate mounting?The GRT757707-0043 housing includes a dump port for the external wastegate connection. The wastegate itself must be sourced separately and is not included.
Installation Overview
- Confirm the G38 or GXR38 supercore is properly assembled with oil and coolant fittings in place
- Align T4 divided inlet to the matching divided T4 exhaust manifold flange and bolt using supplied hardware
- Torque housing bolts to Garrett’s specified value to prevent warping or leaks under heat cycling
- Connect V-Band turbine outlet to downpipe using the included V-Band clamp
- Route external wastegate dump port to downpipe or dedicated dump tube
- Complete oil feed priming and coolant circuit purging before first engine start
- Run initial idle break-in period before operating under full boost
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