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Subaru FA20/FA20DIT Engine Review

FA20/FA20DIT Engine

The new Subaru 2.0-liter engine FA20 was developed for the joint project of Subaru and Toyota (4U-GSE). Subaru FA20 engine application is the Subaru BRZ model - light and sporty coupe. Toyota 4U-GSE engine is installed in the Toyota 86 and the Scion FR-S.

The FB20 cylinder block was taken as the basis. The bottom of the engine was completely redeveloped. It has a new crankshaft, connecting rods and pistons. The engineers built square engine, which means, what the FA20 has an equal bore and stroke dimensions, giving a bore/stroke value of exactly 1:1. Also, the compression ratio is higher than the FB20, and it is 12.5:1. The FA20 has aluminum DOHC cylinder heads with four valves per cylinder. Heads equipped with variable valve timing system (Subaru AVCS) on intake and exhaust camshafts. There are some Toyota technologies in this engine such as direct fuel injection system Toyota D4S. The exhaust system includes steel 4-2-1 exhaust manifold. This naturally aspirated engine name is the FA20D. It produced 200 hp at 7000 rpm and 151 lb-ft, and it is outstanding numbers for a non-turbo 2.0-liter engine.

Engine Specs

Manufacturer
Gunma Oizumi Plant
Production years
2012-present day
Cylinder block material
Aluminum
Cylinder head material
Aluminum
Fuel type
Gasoline
Fuel system
Direct fuel injection
Configuration
Flat-4 (Boxer)
Number of cylinders
4
Valves per cylinder
4
Valvetrain layout
DOHC
Bore, mm
86.0
Stroke, mm
86.0
Displacement, cc
1998
Type of internal combustion engine
Four-stroke, naturally aspirated
Compression Ratio
12.5
10.6 - turbo versions
Power, hp
200 (149 kW)/7000
253 (189 kW)/5600
272 (203 kW)/5600
300 (224 kW)/5600
Torque, lb ft
151 (205 Nm)/ 6400-6600
258 (350 Nm)/ 2000-4800
258 (350 Nm)/ 2000-5200
295 (400 Nm)/ 2000-4800
Engine weight
377 lbs (171kg)
Firing order
1-2 3-4
Engine oil weight
0W-20, 5W-20
5W-30, 5W-40 (FA20DIT)
Engine oil capacity, liter
6.3
5.1 (FA20DIT)
Oil change interval, mile
9,000 (15,000 km) or 12 month
Applications
Subaru BRZ, Subaru Forester, Subaru Legacy, Subaru WRX, Toyota 86, Scion FR-S

FA20 Engine Problems and Reliability

1. Rough idling, shakes at low rpm. That is a problem with the firmware of the ECU. It can be fixed by upgrading or reloading the Engine Control Unit's firmware.
2. The problem with a camshaft gear, which leads to a loss of oil pressure.
The engine requires high premium gasoline (98 octane number) and is exacting to a quality of the engine oil.

Modifications

FA20DIT (and FA20F, FA20E). It is a turbocharged version of the FA20 which came to replace the old EJ205 and EJ207 engines. These versions have lower compression ratio aluminum pistons (10.6:1), redeveloped heads, which provides more airflow and optimized combustion chambers. Turbo engines got camshafts with new specs and plastic intake manifold with TGV valves inside. The FA20 DIT has Twin Scroll turbocharger Garrett MGT2259S, which produces pressure 1.1 bar (1.5 bar in over-boost mode) and makes 272 hp at 5600 rpm and 258 ft-lb of torque.

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