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The Last Oil Pump Gear Your WRX FA20F Will Ever Need
The Boundary FA20F-14MM-OPG is a precision-machined chromoly billet oil pump gear engineered specifically for the 2015 to 2021 Subaru WRX FA20F 2.0L turbo engine. The factory 10mm gear is a known weak point in high-power FA20F builds, and the FA20F-14MM-OPG addresses that directly by increasing gear thickness to 14mm for a 40% boost in oil volume and a meaningful rise in idle oil pressure. Whether you are running a stage 2 tune, an upgraded turbocharger, or simply want peace of mind on a street-driven WRX, the FA20F-14MM-OPG drops in without modifications and delivers consistent oil flow to your bearings and turbo where it matters most. Built in the USA, lifetime warranty.
Key Features
- 14mm Billet Chromoly Gear: Increases oil volume by 40% over the OEM 10mm gear, supporting FA20F builds well beyond 400whp without starving the oiling system
- Surface Hardened and Mirror Finished: The FA20F-14MM-OPG receives a surface hardening process and mirror polish that reduces wear and friction across the full rpm range
- Precision CNC Machined to OEM Tolerances: Drop-in replacement for the factory inner drive gear with no balancing, machining, or modification required on the oil pump housing
- Dual US Patents: Boundary holds two US patents on the FA20F-14MM-OPG gear geometry ensuring no cheap offshore copies can match the precision or fitment
- Made in the USA: Machined at Boundary Racing Pumps in Royse City, Texas, with tight tolerances verified before shipping
- Lifetime Warranty: Covered for the life of the vehicle against manufacturing defects under normal street and track use
What Is Included
- 1x Boundary FA20F-14MM-OPG 14mm Billet Chromoly Oil Pump Gear
Product Specs
| Specification | Detail |
|---|---|
| Part Number | FA20F-14MM-OPG |
| Material | Chromoly Billet Steel |
| Finish | Surface Hardened, Mirror Polished |
| Gear Thickness | 14mm (vs. 10mm OEM) |
| Oil Volume Gain | 40% over stock |
| Manufacturing | CNC Machined, Made in USA |
| Dimensions | 8.5 x 6 x 1 inches |
| Weight | 1 lb |
| Warranty | Lifetime Limited |
| UPC | N/A |
This Part Fits
| Year | Make | Model | Engine |
|---|---|---|---|
| 2015 | Subaru | WRX | FA20F 2.0L Turbo |
| 2016 | Subaru | WRX | FA20F 2.0L Turbo |
| 2017 | Subaru | WRX | FA20F 2.0L Turbo |
| 2018 | Subaru | WRX | FA20F 2.0L Turbo |
| 2019 | Subaru | WRX | FA20F 2.0L Turbo |
| 2020 | Subaru | WRX | FA20F 2.0L Turbo |
| 2021 | Subaru | WRX | FA20F 2.0L Turbo |
Note: The FA20F-14MM-OPG fits WRX models with the FA20F 2.0L turbo engine only. The 2014 WRX and all STI models use a different engine and oil pump and are not compatible with this gear.
Frequently Asked Questions
-
Q: Does the Boundary FA20F-14MM-OPG fit the 2015 to 2021 Subaru WRX?
A: Yes. The FA20F-14MM-OPG is designed specifically for the 2015 to 2021 Subaru WRX equipped with the FA20F 2.0L turbo flat-four engine. It is a direct drop-in replacement for the stock inner drive gear. -
Q: Will the FA20F-14MM-OPG fit the Subaru WRX STI?
A: No. The WRX STI uses the EJ257 2.5L engine with a completely different oil pump. The FA20F-14MM-OPG is for the FA20F turbo engine found in WRX models only, not the STI. -
Q: Will this gear fit a 2014 Subaru WRX?
A: No. The 2014 WRX still used the EJ255 engine. The FA20F engine was introduced in the 2015 WRX. Only 2015 through 2021 WRX models with the FA20F are compatible. -
Q: What does the FA20F-14MM-OPG improve over the stock gear?
A: The OEM inner drive gear is 10mm thick. The FA20F-14MM-OPG measures 14mm and delivers approximately 40% more oil volume per revolution, raising idle oil pressure and improving lubrication to turbo bearings, rod bearings, and camshafts under high-boost conditions. -
Q: Does the Boundary FA20F-14MM-OPG require any machining of the oil pump housing?
A: No modifications to the oil pump housing are required. Boundary machines the FA20F-14MM-OPG to OEM tolerances so it fits the factory oil pump assembly as a direct replacement. -
Q: What material is the FA20F-14MM-OPG made from?
A: Chromoly billet steel, CNC machined to precise tolerances, then surface hardened and mirror polished for maximum wear resistance and reduced friction. -
Q: What power level does the FA20F-14MM-OPG support?
A: The FA20F-14MM-OPG supports FA20F builds well into the 400 to 500whp range. The increased oil volume ensures the oiling system can keep up with the demands of upgraded turbos, higher boost, and aggressive cam timing at elevated rpm. -
Q: What warranty comes with the Boundary FA20F-14MM-OPG?
A: Boundary covers the FA20F-14MM-OPG with a lifetime warranty against manufacturing defects under normal street and track use. This warranty is non-transferable to subsequent vehicle owners. -
Q: Do I need to pair the FA20F-14MM-OPG with an upgraded oil pump cover or backing plate?
A: Boundary recommends inspecting the oil pump housing for wear before installation. Pairing with an upgraded backing plate can maximize volume gains, though the FA20F-14MM-OPG delivers significant improvement on its own.
Installation Instructions
- Professional installation is strongly recommended for the Boundary FA20F-14MM-OPG
- Drain the engine oil and remove the oil pan to access the oil pump
- Remove the oil pump from the engine block following factory service procedures
- Disassemble the oil pump and remove the stock inner drive gear
- Inspect the oil pump housing and outer gear for wear or damage before reinstalling
- Install the FA20F-14MM-OPG in place of the stock inner drive gear, confirming correct seating
- Reassemble the oil pump, reinstall to the engine block with new gaskets, and torque all fasteners to factory spec
- Refill with fresh engine oil, start the engine, and verify oil pressure before driving
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