Subaru 2006 Impreza WRX - Manual (Page 334)

Specifications
12-3
– CONTINUED –
Engine
Electrical system
AT: Automatic transmission
MT: Manual transmission
Engine model EJ253
(2.5-liter, SOHC, non-turbo)
EJ255
(2.5-liter, DOHC, turbo, WRX)
EJ257
(2.5-liter, DOHC, turbo, WRX-STI)
Engine type Horizontally opposed, liquid cooled 4 cylinder, 4-stroke gasoline engine
Displacement cc (cu-in) 2,457 (150)
Bore  Stroke in (mm) 3.9  3.1 (99.5  79.0)
Compression ratio 10.0 : 1 8.4 : 1 8.2 : 1
Firing order 1 – 3 – 2 – 4
Battery type and capacity (5HR) MT 12V-48AH (55D23L)
AT 12V-52AH (75D23L)
Alternator WRX 12V-110A
Except WRX 12V-90A
Spark plugs Non-turbo engine FR5AP-11 (NGK)
Turbo engine ILFR6B (NGK)