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High-Flow V-Band Turbine Housing for Maximum Power G38 Race Builds
The Garrett G38/GXR38 Turbine Housing Kit O/V V-Band / V-Band 1.06 A/R (GRT757707-0039) is the highest-flow V-Band inlet option in the G38 turbine housing family, designed for builds on the G38-1000 or GXR38-64 supercore targeting maximum peak horsepower at high RPM on large-displacement or high-output engines. The 1.06 A/R on GRT757707-0039 reduces turbine back pressure at peak flow, allowing the compressor to operate at its highest efficiency point for sustained top-end power output. Combined with the V-Band inlet and outlet configuration for clean manifold connections and easy turbo rotation, GRT757707-0039 is the preferred housing for dedicated race builds and high-revving large-displacement applications where spool response is sacrificed for raw peak flow capability.
Key Features
- GRT757707-0039 V-Band / V-Band turbine housing with 1.06 A/R for maximum exhaust flow capability
- Highest A/R in the V-Band G38 family for peak power output in large-displacement race applications
- Dual V-Band connections for leak-free sealing and easy turbo service and removal
- Full turbo rotation for optimal oil drain positioning in custom builds
- Stainless steel construction for sustained operation at race temperatures
- External wastegate configuration included for full boost pressure management
- Includes gasket kit, V-Band clamps, and mounting hardware
Specifications
| Detail | Value |
|---|---|
| Part Number | GRT757707-0039 / 757707-0039 |
| Compatible Supercores | G38-1000 (938272-5003S), GXR38-64 (934173-5008S, 934173-5009S) |
| Turbine Inlet | V-Band (open/undivided) |
| Turbine Outlet | V-Band |
| A/R Ratio | 1.06 |
| Wastegate Type | External only |
| Housing Material | Stainless steel |
| UPC | Verify with Garrett distributor |
What’s Included
- 1 x GRT757707-0039 G38/GXR38 Turbine Housing Kit
- Gasket kit
- V-Band clamps for inlet and outlet
- Mounting hardware
- Note: Supercore sold separately
About Garrett Motion
Garrett Motion provides the G38 turbine housing family to complement its G-Series II and G-XRace supercore platforms, enabling professional tuners and builders to optimize turbocharger performance through precise A/R selection matched to their engine and power target. GRT757707-0039 is the peak-performance housing for the most demanding race applications on the G38 platform.
FAQ
What is the GRT757707-0039?The GRT757707-0039 is a Garrett G38/GXR38 turbine housing with V-Band inlet, V-Band outlet, and 1.06 A/R ratio. It provides the maximum exhaust flow of any V-Band G38 housing and is intended for large-displacement or peak-power-focused builds where maximum top-end output takes priority over spool response.
What engine displacement suits GRT757707-0039?The 1.06 A/R housing is best matched to engines above 4.0L in displacement or high-revving builds specifically tuned to make power at the top of the RPM range. On smaller 2.0L to 3.0L engines it may result in noticeable lag compared to the 0.85 or 0.95 A/R options.
How does GRT757707-0039 compare to GRT757707-0037 and GRT757707-0038?All three are V-Band inlet G38 housings. GRT757707-0037 (0.85 A/R) spools quickest. GRT757707-0038 (0.95 A/R) is balanced. GRT757707-0039 (1.06 A/R) flows the most at peak RPM with the most top-end power potential but slowest transient response.
What supercores work with GRT757707-0039?GRT757707-0039 is compatible with the G38-1000 (938272-5003S) and GXR38-64 (934173-5008S and 934173-5009S) supercores. Not compatible with other Garrett frame sizes.
Does GRT757707-0039 require an external wastegate?Yes. All G38 turbine housings are external wastegate only. Source and install a compatible external wastegate separately.
Can I rotate the turbo with GRT757707-0039?Yes. The V-Band inlet configuration on GRT757707-0039 allows full turbo rotation for optimized oil drain routing in the chassis.
Are V-Band clamps for both inlet and outlet included?Yes. GRT757707-0039 includes V-Band clamps for both turbine inlet and turbine outlet connections, the gasket kit, and mounting hardware.
Is GRT757707-0039 standard rotation only?Yes. Standard rotation only. Reverse-rotation variants are separate part numbers not included in this listing.
Installation Overview
- Prepare the G38 supercore with oil and coolant fittings before mounting the turbine housing
- Align and connect the V-Band turbine inlet to your exhaust manifold outlet, rotating the turbo to optimal oil drain position before securing the clamp
- Torque V-Band inlet clamp to specification for a thermally stable seal
- Connect V-Band turbine outlet to downpipe using the included outlet clamp
- Install external wastegate to the manifold or dump port
- Prime oil system before engine start and purge coolant lines
- Perform idle break-in before full-boost operation
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