SUBARU IMPREZA WRX 2011 4.G Owners Manual

12-2Specifications
Specifications
These specifications are subject to change without notice. &Dimensions
in (mm)
Item 4-door
5-door
Non-turbo models Turbo models Non-turbo models Turbo models
Except STI STI Except
OUTBACK OUTBACK Except STI STI
Overall length 180.3 (4,580) 173.8 (4,415)
Overall width 68.5 (1,740) 70.7 (1,795) 68.5 (1,740) 70.7 (1,795)
Overall height 58.1 (1,475) 57.9 (1,470) 58.1 (1,475) 58.3 (1,480) 58.1 (1,475) 57.9 (1,470)
Wheel base 103.1 (2,620) 103.3 (2,625) 103.1 (2,620) 103.3 (2,625)
Tread Front 58.9 (1,495) 60.2 (1,530) 58.9 (1,495) 58.7 (1,490) 60.2 (1,530) Rear58.9 (1,495)*
2
59.1 (1,500)*360.6 (1,540) 58.9 (1,495)*2
59.1 (1,500)*358.9 (1,495) 60.6 (1,540)
Ground clearance*
16.1 (155) 5.9 (150) 6.1 (155) 6.3 (160) 6.1 (155) 5.9 (150)
*1: Measured with vehicle empty
*2: Models with 16-inch wheel tires
*3: Models with 17-inch wheel tires

&Engine
Engine model EJ253
(2.5 L, SOHC, non-turbo) EJ255
(2.5 L, DOHC, turbo, except STI) EJ257
(2.5 L, DOHC, turbo, STI)
Engine type Horizontally opposed, liquid cooled 4 cylinder, 4-stroke gasoline engine
Displacement cc (cu-in) 2,457 (150)
Bore 6Stroke in (mm) 3.963.1 (99.5 679.0)
Compression ratio 10.0 : 1 8.4 : 1 8.2 : 1
Firing order 1
–3 –2–4
& Electrical system
Battery type and capacity (5HR) MT 12V-48AH (55D23L)
AT 12V-52AH (65D23L)
Alternator Non-turbo models 12V-90A
Turbo models 12V-110A
Spark plugs Non-turbo models FR5AP-11 (NGK)
Turbo models SILFR6A (NGK)
AT: Automatic transmission
MT: Manual transmission Specifications
12-3
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12-4Specifications
&Fuel
NOTE
The engine is designed to operate using unleaded gasoline.
Model Fuel requirement Fuel tank capacities
Non-turbo 87 AKI (90 RON) or higher
16.9 US gal (64 liters, 14.1 Imp gal)
Turbo Except STI 91 AKI (95 RON) or higher*
1
STI
93 AKI (98 RON) or higher*2
*1: 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 temporarily used. For details, refer to
“Fuel ”F 7-3.
*2: 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. For details, refer to “Fuel ”F 7-3.

&Engine oil
For the checking, adding and replacing procedure or other details, refer to “Engine oil ”F 11-10.
NOTE
The procedure for changing the engine oil and oil filter should be performed by a properly-trained expert. It is recommended
that you have this service performed by your SUBARU dealer. ! Approved engine oil
Always use the SUBARU approved engine oil. For further details, please contact your SUBARU dealer.
If the approved engine oil is unavailable, use the alternative engine oil described on the next page. Specifications
12-5
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12-6Specifications
!Alternative engine oil
If the SUBARU approved oil is unavailable, the following alternative oil can be used. NOTE
Each quantity indicated here is only a guideline. The necessary quantity for replacement may differ slightly depending on the
temperature and other factors. ! Non-turbo models
Oil grade SAE viscosity No. and
applicable temperature Engine oil capacity
API classification SM or SN with
the words “
ENERGY CONSERVING ”or
“ RESOURCE CONSERVING ”orILSAC GF-4 or GF-5, which can
be identified with the ILSAC
certification mark (Starburstmark) 5W-30 synthetic
oil is the recom-
mended oil for optimum engine perfor-
mance and protection. Conventional oil
may be used if synthetic oil is unavail-able.
*: If 5W-30 synthetic oil is not available,
5W-30 or 5W-40 conventional oil may
be used if replenishment is needed but
should be changed to 5W-30 synthetic
oil at the next oil change.
– Adding the oil from L to F level:
1.1 US qt (1.0 liter, 0.9 Imp qt)
– Changing the oil and oil filter:
4.4 US qt (4.2 liters, 3.7 Imp qt)

!Turbo models
Oil grade SAE viscosity No. and
applicable temperature Engine oil capacity
API classification SM or SN with
the words “
ENERGY CONSERVING ”or
“ RESOURCE CONSERVING ”orILSAC GF-4 or GF-5, which can
be identified with the ILSAC
certification mark (Starburst mark) 5W-30 synthetic
oil is required for
optimum engine performance and pro-
tection. Conventional oil may be used if
synthetic oil is unavailable.
*: If 5W-30 synthetic oil is not available,
5W-30 or 5W-40 conventional oil may
be used if replenishment is needed but
should be changed to 5W-30 synthetic
oil at the next oil change.
– Adding the oil from L to F level:
1.1 US qt (1.0 liter, 0.9 Imp qt)
– Changing the oil and oil filter:
4.4 US qt (4.2 liters, 3.7 Imp qt) Specifications
12-7
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12-8Specifications
&Manual transmission, front differential and rear differential gear oil
Oil grade SAE viscosity No. and applicable temperature Applied part and model Oil capacity
API classification GL-5
Manual transmission 5-speed 3.7 US qt (3.5 liters, 3.1 Imp qt)
6-speed 4.3 US qt (4.1 liters, 3.6 Imp qt)
Front differential (AT models) 1.3 US qt (1.2 liters, 1.1 Imp qt)
Rear differential STI 1.1 US qt (1.0 liter, 0.9 Imp qt) Others
0.8 US qt (0.8 liter, 0.7 Imp qt)
For the checking procedures or other details, refer to “Manual transmission oil ”F 11-21, “Front differential gear oil (AT models) ”F 11-23, “Rear
differential gear oil ”F 11-24.

&Fluids
NOTE
Each quantity indicated here is only a guideline. The necessary quantity for replacement may differ slightly depending on the
temperature and other factors.
Fluid Fluid type Fluid capacity
Automatic transmission fluid (AT models) · SUBARU ATF
· IDEMITSU ATF HP 9.8 US qt (9.3 liters, 8.2 Imp qt)
Power steering fluid · SUBARU ATF·
“Dexron III ”Type Automatic Transmission Fluid 0.7 US qt (0.7 liter, 0.6 Imp qt)
Brake fluid · Genuine SUBARU brake fluid
· FMVSS No. 116, fresh DOT 3 or DOT 4 brake fluid –
Clutch fluid (MT models) –
For the checking procedures or other details, refer to “Automatic transmission fluid ”F 11-22, “Power steering fluid ”F 11-24, “Brake fluid ”F 11-25 or
“ Clutch fluid (MT models) ”F 11-26. Specifications
12-9
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12-10Specifications
&Engine coolant
NOTE
Each quantity indicated here is only a guideline. The necessary quantity for replacement may differ slightly depending on the
temperature and other factors.
Model Coolant capacity Coolant type
Non-turbo models MT models 7.2 US qt (6.8 liters, 6.0 Imp qt)
SUBARU Super Coolant
AT models 7.1 US qt (6.7 liters, 5.9 Imp qt)
Turbo models Except STI 7.8 US qt (7.4 liters, 6.5 Imp qt) STI
8.1 US qt (7.7 liters, 6.8 Imp qt)
For the checking, adding and replacing procedure, or other details, refer to “Cooling system ”F 11-13.

&Tires
Tire size P205/55R16 89V P205/50R17 88V 235/45R17 245/40R18
Wheel size 1666
1/2JJ 17 67JJ 17 68JJ 18 681/2J
Pressure Front 33 psi (230 kPa, 2.3 kgf/cm2)
Rear 32 psi (220 kPa, 2.2 kgf/cm2)
Temporary
spare tire Size T125/70 D17
T135/70 D17
Pressure 60 psi (420 kPa, 4.2 kgf/cm
2)
Wheel nut tightening torque 72 lbf·ft (100 N·m, 10 kgf·m)*
*: This torque is equivalent to applying approximately 88 to 110 lbf (40 to 50 kgf) at the edge of the wheel nut wrench. If you have tightened the wheel
nuts by yourself, have the tightening torque checked at the nearest automotive service facility as soon as possible.
& Wheel alignment
Item 4-door 5-door
Non-turbo models Turbo models Non-turbo models Turbo models
Except STI STI Except
OUTBACK OUTBACK Except STI STI
Toe Front 0+ 0.12 in (0 +3 mm)
Toe angle (sum of both wheels): 0 8+0815 ’
Rear
Camber* Front–0 810 ’+ 0830 ’ –0850 ’+ 0830 ’ –0845 ’+ 0830 ’ –0 810 ’+ 0830 ’ –0805 ’+ 0830 ’ –0805 ’+ 0830 ’ –0 845 ’+ 0830 ’
Rear –1 805 ’+ 0845 ’ –1 835 ’+ 0845 ’ –1830 ’+ 0845 ’ –1805 ’+ 0845 ’ –1835 ’+ 0845 ’ –
1 830 ’+ 0845 ’
*: The differential between right-hand camber and left-hand camber should be within 45 ’or less. Specifications
12-11