The GT2871R Upgrade is engineered specifically for existing GT28RS owners who want more performance without replacing their entire turbo system. This kit swaps in a completely new turbo center section, wheels, and compressor housing while retaining the turbine housing, fittings, flanges, and wastegate already installed on your GT28RS. It’s the direct path to increased boost response and higher peak power for Mazda Protege platforms already running the GT28RS.
Specifications
- Compressor Wheel: 71mm
- Turbine A/R: .71
- Retained Components: Turbine housing, fittings, flanges, and wastegate carried over from the GT28RS
- New Components Included: New turbo center section, new wheels, and new compressor housing
- Alternate Compressor Housing Option: 2 bolt inlet, 3 bolt outlet configuration
- Compressor Housing Upgrade Option: Larger T04E compressor housing with 4 inch inlet, no wastegate actuator
- Compressor Housing Upgrade Option: Larger T04E compressor housing with 2.75 inch inlet, no wastegate actuator
- Compressor Housing Upgrade Option: Even larger T04S compressor housing with 4 inch inlet and 2.50 inch outlet, no wastegate actuator
- Compressor Housing Upgrade Option: Standard T04B compressor housing with 3 inch inlet and 2 inch outlet
- Compressor Housing Upgrade Option: ATP T04B compressor housing with 3 inch Anti-Surge inlet
- Finish Option: Standard
- Finish Option: Black Powder Coat
- Finish Option: Polished
Performance & Application
This upgrade is built for Mazda Protege owners currently running a GT28RS who want to step up compressor and turbine performance without sourcing an entirely new turbo system. By replacing the center section, wheels, and compressor housing while keeping the existing turbine housing, fittings, flanges, and wastegate, the upgrade delivers improved boost response and increased peak power potential. It’s a cost-effective way to extract more performance from an already-installed GT28RS setup. This makes it ideal for enthusiasts looking to progress their build without a full system replacement.
Compatibility & Fitment
- Mazda Protege — vehicle-specific turbocharger upgrade
- Designed as a direct upgrade path for existing GT28RS turbo installations
Frequently Asked Questions
- What is the A/R ratio of this turbine?
- The turbine A/R ratio is .71.
- What size compressor wheel does this upgrade use?
- This upgrade uses a 71mm compressor wheel.
- What does “GT28RS to GT2871R Upgrade” mean?
- It refers to this specific upgrade kit for current GT28RS customers, which includes a new turbo center section, wheels, and compressor housing while retaining the turbine housing, fittings, flanges, and wastegate from the original GT28RS.
- Do I need to replace my turbine housing or wastegate with this kit?
- No — all other components, including the turbine housing, fittings, flanges, and wastegate, are retained from your existing GT28RS.
- What compressor housing finish options are available?
- This upgrade is available with a standard finish, a black powder-coated finish, or a polished finish.
For GT28RS owners on a Mazda Protege platform who want more response and top-end power without starting over, this upgrade delivers exactly that — using proven Garrett components paired with the turbine housing and wastegate you already trust.
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