Subaru WRX & WRX STI Manuals 2011 Impreza WRX & WRX STI Owner's Manual | Page 411

Specifications

12-3

& Engine
Engine model

EJ253
(2.5 L, SOHC, non-turbo)

Engine type

EJ255
(2.5 L, DOHC, turbo, except STI)

EJ257
(2.5 L, DOHC, turbo, STI)

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

Displacement cc (cu-in)

2,457 (150)

Bore 6 Stroke in (mm)

3.9 6 3.1 (99.5 6 79.0)

Compression ratio

10.0 : 1

8.4 : 1

8.2 : 1

1–3–2–4

Firing order

& Electrical system
Battery type and capacity (5HR)

12V-48AH (55D23L)

AT
Alternator

MT

12V-52AH (65D23L)
12V-90A

Turbo models
Spark plugs

Non-turbo models

12V-110A

Non-turbo models

FR5AP-11 (NGK)

Turbo models

SILFR6A (NGK)

AT: Automatic transmission
MT: Manual transmission

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