Subaru WRX & WRX STI Manuals 2017 WRX & WRX STI Owner’s Manual | Page 538

Specifications/Specifications

12-3

& Engine
Model
Engine model
Engine type

STI

Except STI

EJ25
(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)

122 (1,998)

Bore 6 Stroke in (mm)

3.92 6 3.11 (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

Fuel tank capacity
1

STI

93 AKI (98 RON) or higher*

Except STI

91 AKI (95 RON) or higher*2

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 AKI (90 RON) or higher
may be used.

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