When Subaru and Toyota co-developed the platform that launched the rear-wheel-drive sports coupe, enthusiasts zeroed in on what sat beneath the hood. The 2013 Subaru BRZ engine isn't a powerhouse built for straight-line drag racing. Instead, it's a high-revving, naturally aspirated flat-four engineered for balance, sharp throttle response, and razor-sharp handling. If you're looking at buying a used model or trying to understand why this specific powerplant sparked so much tuning culture, you need to look past the horsepower numbers and examine how the FA20 engine actually operates.
Beneath the aluminum hood lies the Subaru FA20 Boxer engine, displacing 2.0 liters with an oversquare 86mm bore and 86mm stroke. It pushes out 200 horsepower at 7,000 RPM and 151 lb-ft of torque peaking between 4,000 and 6,600 RPM. Unlike traditional inline-four engines, the horizontally opposed layout sits low in the chassis, dropping the center of gravity significantly. This design choice gives the BRZ its telepathic steering response and cornering agility, but it also creates unique packaging and maintenance quirks that every owner should know.
Inside the FA20: Architecture and Design
The engine in the 2013 BRZ represents a unique joint venture between Subaru and Toyota. Subaru supplied the core boxer architecture, while Toyota contributed its D-4S direct and port injection system. This dual-injection setup places one injector directly into the combustion chamber and another in the intake manifold.
At low and medium loads, the port injectors spray fuel to ensure a clean air-fuel mixture and prevent carbon buildup on the intake valves. Under heavy throttle and high RPMs, the direct injectors take over, spraying fuel straight into the cylinders for maximum cooling and efficiency. This system allows the engine to run a high compression ratio of 12.5:1 on regular premium fuel without severe knocking.
The block and cylinder heads are cast aluminum, featuring an open-deck design on early models. Because the cylinders are laid flat horizontally, pistons move in opposite directions, canceling out primary vibrations naturally. This smooth mechanical balance means the engine doesn't require heavy internal balancer shafts, saving weight and freeing up throttle response.
Performance Reality Check
Numbers on paper often cause division among car enthusiasts. Two hundred horsepower doesn't sound like much for a modern sports car, and the torque curve features a notorious dip right around 3,500 to 4,500 RPM. This mid-range dip occurs right where the engine transitions between port and direct injection, creating a sluggish spot when you accelerate out of tight corners on a track.
To get the most out of the powerband, you have to keep the tachometer dancing between 5,000 and 7,400 RPM. Short-shifting feels sluggish, but ringing out the gears transforms the driving experience. The factory redline sits at 7,400 RPM, and the engine begs to be driven hard.
When paired with the standard six-speed manual transmission, the car hits zero to sixty in about 6.5 seconds. The six-speed automatic features paddle shifters, but it shifts slower and dampens the already modest torque delivery. If you want to dive deeper into official specifications and vehicle history, you can check resources like Subaru Global.
Maintenance Realities and Common Issues
Owning an early production model means dealing with known mechanical gremlins. The 2013 model year, in particular, carries specific service bulletins and potential failure points that require attention.
- Valve Spring Recall: Early 2013 BRZ engines manufactured between April and July 2012 suffered from faulty valve springs that could fracture under high stress, leading to catastrophic engine failure. Subaru issued a massive safety recall. If you're buying a used 2013 model, always run the VIN to confirm the recall service was completed properly. Improper dealer reassembly during this recall caused secondary engine failures for some owners, so service history records matter immensely.
- Oil Consumption: While not as notorious as some EJ-series engines, early FA20 powerplants can consume oil between changes, especially when driven hard on track days. Checking your oil level every other fuel fill-up prevents starved bearings.
- Throw-Out Bearing Failure: Manual transmission cars from this era frequently experience noisy or failing throw-out bearings. If you hear a chirping sound when your foot is off the clutch pedal, the bearing needs replacement before it damages the transmission snout.
- Cam Carrier Leaks: The liquid gasket sealant used to seal the aluminum cam carriers can degrade over time, leading to slow oil seepage. Fixing this requires pulling the engine, making it an expensive repair if left unattended.
Upgrades and Modification Potential
The aftermarket scene for the BRZ is massive. Because the engine features a high 12.5:1 compression ratio straight from the factory, bolting on a turbocharger without upgrading internal components like pistons and rods is risky. High boost leads to quick detonation and cracked ring lands.
Most owners start with simpler breathing modifications. A quality header-back exhaust system paired with an aftermarket ECU tune helps smooth out that dreaded torque dip in the mid-range. For those chasing serious power, supercharger kits or built-motor turbo setups transform the car completely, though reliability depends heavily on the quality of the tuning. For more technical details on automotive engineering principles, visit SAE International.
Frequently Asked Questions
What kind of fuel does the 2013 Subaru BRZ engine require?
It requires 91 octane premium gasoline minimum. Running lower octane fuel triggers knock sensors, reduces power output, and can cause long-term internal engine damage due to pre-ignition.
How much oil does the engine take during an oil change?
The FA20 engine takes approximately 5.7 US quarts (5.4 liters) of 0W-20 synthetic oil when changing the oil and filter. Always check the dipstick on a level surface after filling.
Is the 2013 BRZ engine an interference engine?
Yes. The engine uses a timing chain rather than a rubber belt, but if the valve train fails or the chain slips, the pistons and valves will collide, causing severe engine damage.
Why is there a torque dip in the 2013 BRZ powerband?
The dip between 3,500 and 4,500 RPM is caused by the transition zone where the engine management system switches between Toyota's port injection and direct injection strategies. An aftermarket tune and aftermarket header can largely eliminate this flat spot.
