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1,000 Horsepower G-Series II Platform Supercore with Next-Generation Compressor Aero
The Garrett G38-1000 62mm G-Series II Supercore (GRT938272-5003S) is a purpose-built high-horsepower turbocharger core engineered to support 500 to 1,000 horsepower on 2.0L to 5.5L engine displacements. The GRT938272-5003S features Garrett’s refined G-Series II compressor aerodynamics, delivering improved pressure ratio capability and airflow efficiency over the original G-Series platform, while retaining compatibility with the full G-Series turbine housing family including the 0.85, 0.95, and 1.06 A/R housings in both V-Band and T4 divided inlet configurations. The 62mm compressor inducer paired with a 74mm turbine inducer and 66mm exducer provides balanced spool and peak-flow characteristics across the 500 to 1,000 horsepower range, making GRT938272-5003S a versatile foundation for high-output street and race builds.
Key Features
- GRT938272-5003S G-Series II G38-1000 supercore with V-Band compressor outlet and 62mm inducer
- G-Series II compressor aero provides improved efficiency and higher pressure ratio capability over Gen I
- Dual ceramic ball bearing center section delivers faster spool and reduced parasitic friction
- Inconel turbine wheel for sustained high-temperature durability in boosted applications
- 74mm turbine inducer flows up to 43 lbs/min exhaust gas for strong mid-range and peak power
- Compatible with all G38 turbine housing kits including 757707-0037, 0038, 0039 (V-Band) and 0042, 0043, 0044 (T4/V-Band)
- V-Band compressor outlet (117.4mm / 4.622 inch OD) matches GTX42, GTX45, and G42 dimensions for easy kit integration
- Machined speed sensor port and water fittings included
Specifications
| Detail | Value |
|---|---|
| Part Number | GRT938272-5003S / 938272-5003S |
| Model | G-Series II G38-1000 |
| Compressor Inducer | 62mm |
| Compressor Exducer | 88mm |
| Compressor Trim | 51 |
| Compressor A/R | 0.84 (V-Band outlet) |
| Turbine Inducer | 74mm |
| Turbine Exducer | 66mm |
| Turbo Reference | 6266 |
| Horsepower Rating | 500 to 1,000 HP |
| Engine Displacement | 2.0L to 5.5L |
| Max Speed | 125,000 RPM |
| Bearing System | Dual ceramic ball bearing |
| V-Band Outlet OD | 117.4mm (4.622 in) |
| Turbine Flow | Up to 43 lbs/min |
| UPC | Verify with Garrett distributor |
What’s Included
- 1 x GRT938272-5003S G-Series II G38-1000 Supercore Assembly
- Gasket kit
- 2 x AN6 water fitting nipples for coolant connections
- Note: Turbine housing kit must be purchased separately
About Garrett Motion
Garrett Motion is the world’s foremost turbocharger manufacturer, with a legacy spanning six decades and products trusted across Formula 1, WRC, IndyCar, and the full spectrum of road racing and drag racing. The G-Series II platform represents Garrett’s most advanced production turbo engineering, optimized for maximum efficiency and power density in both professional and enthusiast applications.
FAQ
What is the GRT938272-5003S?The GRT938272-5003S is the Garrett G-Series II G38-1000 supercore, a 62mm compressor inducer turbocharger assembly rated for 500 to 1,000 horsepower on 2.0L to 5.5L engines. It is the complete rotating assembly with compressor housing and requires a compatible turbine housing kit to become a functional turbocharger.
What turbine housings are compatible with GRT938272-5003S?The G38-1000 supercore is compatible with Garrett G38 turbine housing kits: GRT757707-0037 (0.85 A/R V-Band), GRT757707-0038 (0.95 A/R V-Band), GRT757707-0039 (1.06 A/R V-Band), GRT757707-0042 (0.85 A/R T4 divided), GRT757707-0043 (0.95 A/R T4 divided), and GRT757707-0044 (1.06 A/R T4 divided). All turbine housings sold separately.
What is the difference between G-Series I and G-Series II?The G-Series II platform features updated compressor aerodynamics offering improved pressure ratio capability and efficiency compared to the original G-Series. The G-Series II provides higher achievable boost and better compressor map width, especially useful in builds targeting the upper end of the power range.
Will GRT938272-5003S work on my 2.0T engine?Yes, the G38-1000 is designed for 2.0L to 5.5L displacements. At maximum spool on a 2.0L, expect it to come into its power band at slightly higher RPM than a smaller frame turbo, making it best suited for builds targeting 600 horsepower or more where sustained peak power matters more than low-RPM response.
Does the G38-1000 require an external wastegate?Yes. All G38 series turbine housing kits are externally wastegated. An external wastegate is required and not included with GRT938272-5003S.
Is the V-Band outlet on GRT938272-5003S compatible with GTX42 charge pipes?Yes. The V-Band compressor outlet on GRT938272-5003S measures 117.4mm (4.622 inch OD), which is identical to the GTX42, GTX45, and G42 models, enabling direct compatibility with charge pipes engineered for those platforms.
What speed sensor kit should I use with the G38-1000?Garrett’s G-Smart speed sensor kits PN 781328-0003 (street, with gauge) and 781328-0004 (professional, without gauge) are compatible with GRT938272-5003S. The machined port on the backplate accepts either kit for turbo speed monitoring.
Does this supercore work with reverse-rotation applications?No. GRT938272-5003S is standard rotation only. Reverse-rotation supercores are separate part numbers and are not cross-compatible with standard rotation turbine housings.
Installation Overview
- Choose a compatible G38 turbine housing kit based on your exhaust manifold flange (T4 divided or V-Band) and desired A/R ratio
- Pre-install AN6 oil and coolant feed/return fittings before assembly
- Mate turbine housing to supercore using supplied gasket kit, torquing fasteners to Garrett specifications
- Connect V-Band compressor outlet to intercooler inlet piping using a V-Band clamp
- Install external wastegate on the exhaust manifold or turbine housing dump port
- Prime oil feed line at cranking RPM before first fire to protect ball bearing CHRA
- Initial run at idle for 5 or more minutes, checking oil and coolant connections for leaks before driving under boost
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