Tomioka Racing GTX29 Gen II DCBB Turbocharger — 2015-2021 Subaru WRX / 2014-2018 Forester XT
The Tomioka Racing GTX29 Gen II Dual Ceramic Ball Bearing for the 2015-2021 Subaru WRX FA20DIT and 2014-2018 Forester XT FA20DIT is a significant engineering step beyond the previous generation — 8% larger turbine wheel, new dual ceramic ball bearing design, and a point-milled billet compressor wheel with bullet locking nut. At 600 HP capability it is the highest-capacity bolt-on turbo available for the FA20DIT platform. Replaces OEM # 14411AA880 / 14411-AA881.
DETAILS
- Platform: 2015-2021 Subaru WRX FA20DIT, 2014-2018 Subaru Forester XT FA20DIT
- Gen II: 8% larger turbine wheel vs Gen I
- New dual ceramic ball bearing CHRA design
- Point-milled billet compressor wheel with bullet locking nut
- Compressor: 72 mm / turbine: 61 mm
- Turbine housing: 10 cm²
- Actuator: 1.03 bar / 15 psi — adjustable wastegate
- Max. power: 600 HP / max boost: 32 PSI
- Replaces OEM # 14411AA880 / 14411-AA881
- 100% bolt-on — standard Subaru 5-bolt flange
- NOTE: Oil pressure regulator not included — Turbosmart TS-0811-0012 OPR V2 recommended
| Bearing Type | Dual ceramic ball bearing |
|---|---|
| Flange Type | Standard Subaru 5-bolt |
| Compressor Inlet | 72 mm |
| Compressor Exducer | — |
| Turbine Inlet | 61 mm |
| Turbine Exducer | — |
| Turbine Housing | 10 cm² |
| Actuator / Gate Pressure | 1.03 bar / 15 psi |
| Max. Power | 600 HP |
| Replaces OEM # | 14411AA880 / 14411-AA881 |
| Max boost | 32 PSI |
Turbocharger Design and Specifications
A ball bearing turbocharger replaces oil-film journal bearings with angular contact ceramic ball bearings. Ceramic ball bearings operate with significantly less friction — the mechanism behind faster spool time. Dual Ceramic Ball Bearing (DCBB) designs use two separate bearing assemblies for additional support and reduced deflection under high load. Ball bearing turbos also require less oil flow, reducing the risk of oil coking during hot shutdowns.
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
- 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 GTX29 Gen II DCBB is the premium bolt-on turbo for FA20DIT WRX and Forester XT builds targeting 600 HP. The Gen II’s 8% larger turbine wheel and new DCBB design represent a genuine advancement over the previous generation — quicker spool, higher efficiency, greater durability. For FA20DIT owners who have exhausted the factory turbo’s capability, this is the correct choice.
Fitment
| Year | Make | Model | Notes |
|---|---|---|---|
| 2015-2021 | Subaru | WRX | FA20DIT MT/CVT |
| 2014-2018 | Subaru | Forester XT | FA20F |
Reviews
There are no reviews yet.