Tomioka Racing TD05-20G Bolt-On Turbocharger — 2008-2014 Subaru WRX / 2005-2009 Legacy GT
The Tomioka Racing TD05-20G for the 2008-2014 Subaru WRX, 2005-2009 Legacy GT, and 2009-2013 Forester XT is the most popular street/track bolt-on for GR EJ255 applications — 52.5 mm inducer, 8 cm² housing, 450 HP ceiling, and the responsive daily-drivable character that has made it the standard Subaru turbo upgrade across generations.
DETAILS
- Platform: 2008-2014 Subaru WRX EJ255, 2009-2013 Forester XT EJ255, 2005-2009 Legacy GT EJ255
- Journal bearing construction
- Compressor: 52.5 mm inlet / 68 mm exducer
- Turbine: 56 mm inlet / 49.2 mm exducer
- Turbine housing: 8 cm²
- Actuator: 1.1 bar / 16 psi
- Max. power: 450 HP
- 100% bolt-on — standard Subaru 5-bolt flange
- Complete kit included
| Bearing Type | Journal bearing |
|---|---|
| Flange Type | Standard Subaru 5-bolt |
| Compressor Inlet | 52.5 mm |
| Compressor Exducer | 68 mm |
| Turbine Inlet | 56 mm |
| Turbine Exducer | 49.2 mm |
| Turbine Housing | 8 cm² |
| Actuator / Gate Pressure | 1.1 bar / 16 psi |
| Max. Power | 450 HP |
Turbocharger Design and Specifications
A journal bearing turbocharger uses a hydrodynamic oil film to support the rotating shaft, requiring oil pressure to build before full-throttle use and a cool-down period after hard use before shutdown. Journal bearings are proven and durable — TR journal bearing turbos use the standard Subaru 5-bolt flange and include all oil and water connections for direct installation at the factory turbocharger location.
Installation, Kit Contents, and Wastegate Spring Guide
Each Tomioka Racing turbocharger kit includes all hardware needed for installation: the turbocharger unit, wastegate actuator, oil feed and return pipes, water cooling connections, all gaskets, and the hardware kit. All current production TR turbos include a billet wastegate actuator. Professional installation is recommended. For DCBB turbos, a Turbosmart TS-0811-0012 OPR V2 Turbo Oil Pressure Regulator is recommended to ensure correct oil pressure at the bearing unless otherwise noted.
Wastegate Spring Selection: 1.1 bar vs 1.3 bar
The actuator spring sets the gate pressure — the minimum boost the turbocharger will produce. You cannot run boost lower than the spring rating.
Choose 1.1 bar (16 psi) if your boost targets include values below approximately 22 psi, or if you run multiple maps including a low-boost street mode.
Choose 1.3 bar (19 psi) if your minimum target boost is 19 psi or higher and your normal target is in the 22-28 psi range. Better control stability at higher targets and better resistance to premature wastegate opening under high backpressure.
As a general guideline, peak target boost should not exceed approximately 2x the gate pressure for stable boost control authority.
What’s in the Box
- Turbocharger
- Billet wastegate actuator
- Oil feed pipe
- Water pipe
- Gaskets
- Hardware kit
Why Choose Tomioka Racing (TR)
Tomioka Racing has been building direct-fit turbocharger upgrades for Subaru performance vehicles since the early 2000s. Every TR turbocharger is engineered around the factory connection points — oil feed, water cooling, mounting flange, and charge pipe inlet all match OEM positions — so installation is genuine bolt-on without custom fabrication. TR covers the full span of EJ-series and FA-series Subaru platforms, from the GC8 through the current VB WRX, and their turbochargers are proven in both street and motorsport use including rally racing. Each kit ships complete with turbocharger, actuator, oil pipe, water pipe, gaskets, and hardware — everything needed for the swap in one box. RallySport Direct stocks the full TR turbocharger catalog because their engineering quality and fitment accuracy are what our customers expect.
The RallySport Take
The TR TD05-20G for the GR platform is the most popular single-turbo bolt-on choice for GR WRX, Legacy GT, and Forester XT owners who want maximum performance from a direct replacement without changing the car’s character. The right balance at 450 HP for GR EJ255 builds.
Fitment
| Year | Make | Model | Notes |
|---|---|---|---|
| 2008-2014 | Subaru | WRX | EJ255 MT |
| 2009-2013 | Subaru | Forester XT | EJ255 |
| 2005-2009 | Subaru | Legacy GT | EJ255 |
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