Garrett G38 Turbine Housing Kits
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Garrett
Garrett G-XRace GXR38-64 64.9mm Turbocharger
$3,199.90
COMPRESSOR MAP EXHAUST FLOW CHART
COMPRESSOR OUTLET
TURBINE HOUSING
PRODUCT DETAILS
The G-XRace GXR38-64 64.9mm is from Garrett's G-XRace line, developed for drag racing. G-XRace compressors use Garrett's XBoost technology for more airflow and higher pressure ratio capability than the comparable Garrett G-Series or GTX model, and several sizes are built around drag racing class compressor inducer rules. Confirm your class rules before ordering.
Garrett rates the G-XRace GXR38-64 64.9mm for 500 to 1,150 horsepower on 2.0 to 5.5 liter engines.
Key Specifications
- Series — G-XRace
- Frame size — 38 frame
- Horsepower rating — 500–1,150 hp (Garrett rating)
- Engine displacement — 2.0–5.5 L
- Compressor wheel — 64.9 mm inducer, 88 mm exducer
- Turbine wheel — 74 mm inducer, 66 mm exducer
- Maximum turbo speed — 125,000 rpm
- Supercore part number – V-Band Outlet — 934173-5008S
- Supercore part number – Hose Outlet — 934173-5009S
Turbine Housing Options
Each turbine housing is listed by A/R (area-to-radius ratio), inlet flange, outlet and wastegate type. "Internal" housings have a built-in wastegate; "External" housings are free-float designs that require an external wastegate.
| Garrett part number | A/R | Inlet | Outlet | Wastegate | Divided |
|---|---|---|---|---|---|
| 757707-0037 | 0.85 | V-Band | V-Band | External | No |
| 757707-0038 | 0.95 | V-Band | V-Band | External | No |
| 757707-0039 | 1.06 | V-Band | V-Band | External | No |
| 757707-0042 | 0.85 | T4 | V-Band | External | Yes |
| 757707-0043 | 0.95 | T4 | V-Band | External | Yes |
| 757707-0044 | 1.06 | T4 | V-Band | External | Yes |
Important Information
Garrett calculates its horsepower ratings from the compressor map choke flow, which represents the potential flywheel horsepower of the turbo. Actual results depend on the engine, supporting modifications and calibration.
Garrett sets the maximum allowable speed for this turbo at 125,000 rpm. Operating above that speed can damage the turbo and cause premature failure. A turbo speed sensor (sold separately) lets you monitor shaft speed.
For race vehicles only. Not for use on public roads.
Installation and Tuning Available at Race Protocol
Turbo system design, installation and dyno tuning are available in house. Call (724) 732-8948 to discuss your build.
