Subaru WRX & WRX STI Manuals 2015 WRX & WRX STI Owner's Manual | Page 468

Specifications/Specifications

12-3

& Engine
Model

STI

Engine model
Engine type

Except STI

EJ257
(2.5 L, DOHC, turbo)

FA20
(2.0 L, DOHC, turbo)

Horizontally opposed, liquid cooled 4 cylinder, 4-stroke petrol engine

Displacement cu-in (cc)

150 (2,457)

121.9 (1,998)

Bore 6 Stroke in (mm)

3.9 6 3.1 (99.5 6 79.0)

3.39 6 3.39 (86.0 6 86.0)

Compression ratio

8.2 : 1

10.6 : 1
1–3–2–4

Firing order

& Fuel
NOTE
The engine is designed to operate using unleaded gasoline.
Model

Fuel

STI

93 AKI (98 RON) or higher*1

Except STI

91 AKI (95 RON) or higher*2

Fuel tank capacity
15.9 US gal (60 liters, 13.2 Imp gal)

*1: If unleaded gasoline with an octane rating of 93 AKI (98 RON) is not available, unleaded gasoline with an octane rating of 91 AKI (95 RON) may be
used with no detriment to engine durability or driveability.
*2: If unleaded gasoline with an octane rating of 91 AKI (95 RON) is not available, unleaded gasoline with an octane rating of 87 A