- Overview, problems
- Performance tuning
Subaru EJ25 engine specs
|Manufacturer||Gunma Oizumi Plant|
|Also called||Subaru EJ25|
|Cylinder block alloy||Aluminum|
2 valves per cylinder
4 valves per cylinder
|Piston stroke, mm (inch)||79 (3.62)|
|Cylinder bore, mm (inch)||99.5 (3.86)|
|Compression ratio||8.2 (EJ257)|
9.5 (EJ25D 1996)
9.7 (EJ25D 1997-1999)
|Displacement||2457 cc (338.8 cu in)|
|Power output||224 kW (155 HP) at 5,600 rpm|
239 kW (165 HP) at 5,600 rpm
298 kW (165 HP) at 5,600 rpm
300 kW (173 HP) at 5,600 rpm
224 kW (170 HP) at 6,000 rpm
239 kW (210 HP) at 5,600 rpm
298 kW (230 HP) at 5,600 rpm
300 kW (250 HP) at 6,000 rpm
239 kW (265 HP) at 6,000 rpm
298 kW (280 HP) at 5,600 rpm
300 kW (300 HP) at 6,000 rpm
|Torque output||190 Nm (385 lb·ft) at 2,800 rpm|
220 Nm (393 lb·ft) at 4,000 rpm
226 Nm (413 lb·ft) at 4,400 rpm
225 Nm (406 lb·ft) at 4,000 rpm
238 Nm (385 lb·ft) at 2,800 rpm
320 Nm (393 lb·ft) at 3,600 rpm
320 Nm (413 lb·ft) at 3,600 rpm
339 Nm (406 lb·ft) at 3,600 rpm
347 Nm (393 lb·ft) at 2,800 rpm
392 Nm (413 lb·ft) at 4,000 rpm
407 Nm (406 lb·ft) at 4,000 rpm
|HP per liter||63.1|
|Weight, kg (lbs)||120 (500)|
|Fuel consumption, L/100 km (mpg)|
|for WRX STI VA|
|Turbocharger|| Naturally aspirated|
Mitsubishi TD04L (WRX/Forester)
IHI VF39 (STI)
IHI VF41 (Forester STI)
IHI VF45 (Legacy GT)
IHI VF46 (Legacy GT)
IHI VF48 (STI)
IHI VF52 (WRX)
|Oil consumption , L/1000 km|
(qt. per miles)
|up to 1.0|
(1 qt. per 600 miles)
|Recommended engine oil||0W-30|
|Engine oil capacity, L (qt.)||4.0 (EJ25D, EJ25 2007+)|
|Oil change interval, km (miles)||5,000-10,000|
|Normal engine operating temperature, °C (F)||–|
|Engine lifespan, km (miles)|
-No life span loss
|The engine is installed in||Subaru Impreza (WRX/STI)|
Subaru EJ25 engine reliability, problems and repair
This engine was produced since 1995 and was the biggest engine of the EJ family. It was widely applied in all main car models .
Subaru EJ25 engine used the aluminum cylinder block with dry sleeves. It is similar to the EJ20 cylinder block, but diameter of cylinders was increased to 99.5 mm, cylinder block deck height remained the same (201 mm). It contained the crankshaft with a piston stroke 79 mm. The rod length remained the same 130.5 mm, and piston compression height decreased to 30.7 mm. Due to all this it was possible to get 2.5 liters capacity.
The first variant of EJ25 Phase 1 was called EJ25D and it used DOHC cylinder heads with 4 valves on the cylinder. The timing system uses timing belt. The timing belt replacement is necessary for each 50,000-60,000 miles of mileage (90,000-100,000 km).
The EJ25D power is 155 HP at 5,600 rpm. In 1997 pistons were modified, and power increased to 165 HP.
This motor was used for Subaru till 1998, then it was replaced by EJ251 engine.
EJ251 belongs to Phase 2 and it used new SOHC heads, one camshaft for each. Also new moly coated pistons were used, and compression ration was increased to 10.1.
In the State of California you can find EJ252 engines, meeting the advanced environmental standards. EJ252 differs in intake system, throttle body and the placement of idle air control valve and MAP sensor.
Since 1999 Subaru started producing EJ253 engine. It differs in MAF sensor, and also intake manifold which uses Tumble Generator Valves. It improved its ecological index.
Since 2006, they began to apply variable valve lift system i-AVLS, on the intake side.
In 2009 this motor was slightly modified: it received lightweight pistons, changed intake ports, new plastic intake manifold, new spark plugs, improved i-AVLS system and lightweight exhaust system.
Now we will examine engines with DOHC heads.
In 1998 they started production of EJ254 engine which used DOHC heads. It is a direct successor of EJ25D and refers to Phase 2. EJ254 motor used variable valve timing system AVCS on intake camshafts.
Subaru EJ255 engine was applied for Forester, Impreza WRX and Legacy (2004-2005). This turbocharged motor had semi-closed deck block, DOHC heads and variable valve timing system AVCS on intake cams. The compression ratio was reduced to 8.4 on EJ255 and TD04L turbocharger was applied. Maximum boost pressure is 11.5 psi (0.8 bar). Due to all this, Subaru EJ255 shows 210 HP at 5,600 rpm.
Also there is EJ255 version with the increased intercooler and with maximum boost pressure 13.5 psi (0.93 bar). It allowed to receive the power 230 HP at 5,600 rpm.
VF41 turbocharger is applied to EJ255 which is installed on JDM Forester STI. Subaru Impreza WRX III has VF52 turbocharger, with the maximum boost pressure 13.3 psi (0.92 bar).
Subaru Legacy GT (till 2009) had VF46 turbocharger. Its maximum boost pressure 13.8 psi (0.95 bar) that gave the chance to get 250 HP at 6,000 rpm, and torque 339 Nm at 3,600 rpm.
2009+ Legacy GT had VF45 turbocharger, its boost pressure was 12.5 psi (0.87 bar). Such Legacy GT developed 265 HP at 5,600 rpm, and engine torque 350 Nm at 2,400 rpm.
Subaru Impreza WRX STI had EJ257 engine with semi-closed deck block. The main differences between EJ255 and EJ257 that EJ257 uses new low compression pistons (compression ratio is 8.0) modified heads with changed combustion chambers and with AVCS system. This engine uses IHI VF48 turbocharger, its maximum boost pressure is 14.5 psi (1 bar). This is enough to get 280 HP at 5,600 rpm.
2007+ Subarus Impreza WRX STI III received changed EJ257 engine: compression ratio is increased to 8.2, and it also uses variable valve timing system Dual AVCS on intake and exhaust camshafts.
Because of this, power increased to 300 HP at 6,000 rpm, and torque 407 Nm at 4,000 rpm.
USDM Impreza WRX STI used IHI VF39 turbocharger, and boost pressure is 14.5 psi (1 bar).
EJ25 firing order is 1-3-2-4.
Except well- known EJ20 and EJ25, the Subaru EJ family also includes: EJ15, EJ16, EJ18 and EJ22.
In 2011 naturally aspirated EJ25 was replaced with FB25, and turbocharged EJ25 with FA20DIT.
Subaru EJ25 engine problems and malfunctions
The main problems of EJ25 are high oil consumption, oil leak, knocking. EJ20 engine has similar problems. HERE you can learn in details about them their reliability.
Besides, due to the increased diameter of cylinders, sidewalls between cylinders became thinner. It may cause EJ25 overheating. If it happens, then there is a high risk that heads of the cylinder block will be deformed and in its turn it will cause leaks through the head gaskets.
Also, having EJ257 and EJ255, you may face connecting rod bearing failure, especially after power increase.
Subaru EJ25 engine tuning
Probably, you want to know more about how to turbo EJ25? There is no sense to waste time for improvement of naturally aspirated EJ25, you will just waste your money. It is even more useless to build NA EJ25. Sell it and buy turbocharged EJ255 (WRX) or EJ257 (WRX STI).
To increase turbocharged EJ25 power, you need to buy downpipe and to adjust ECU more aggressively. It will give additional 30-40 horsepower.
If you are the owner of EJ255, then you need some modifications such as aluminum 2-row Mishimoto radiator, FMIC, EJ257 intake system, BOV valve, WRX STI oil pump, new spark plugs, WRX STI injectors, Walbro 255 lph fuel pump, ACL bearings, the boost controller, 3″ performance exhaust system. But all this makes no sense if you use stock turbocharger, therefore you should buy IHI VF48.
Such engine will show 300+ horsepower.
Your Subaru WRX STI with EJ257 engine seems to be slow? Then let’s make it go faster. For building EJ257, you need to buy FMIC, HKS BOV, Cosworth fuel rail, 800 cc fuel injectors, heavy duty timing belt, cold air intake, 12 mm oil pump, oil cooler, NGK iridium 8 spark plugs, equal length headers and 3″ performance exhaust system. You also need TD05-18G turbocharger and after installation of all these performance parts, you need the ECU control. All this will allow to receive 350+ horsepower.
To increase power even more, you will need to buy additionally to the above mentioned STi Group N engine mount set, a 3-row Mishimoto radiator, sump baffle plate, 1000 cc fuel injectors, Garrett GTX 3076R turbocharger, wastegate tial 44 mm, Aeromotive fuel regulator, fuel lines. Still it is necessary to buy H-beam rods, forged pistons, ACL rod and main bearings, 278/274 cams, Manley valves, valve spring and retainer kits, Cometic MLS head gaskets, ARP cylinder head stud kit. It will be very good if you make port and polish for heads and remove TGV valves in intake manifold.
Using these aftermarket parts and ECU Ecutek, you receive 450-500 horsepower and it will be fast low 11 sec 1/4 mile car.
Subaru EJ25 2.5L Engine Specs, Problems & Reliability
The 2.5-liter engine from EJ series appeared in 1995. EJ25 is the biggest engine among other EJ engines - EJ15, EJ16, EJ18, EJ20, and EJ22. The engine became widespread in all major models of the brand.
This engine uses the similar EJ20 cylinder block which differs by the bigger bore (99.5 mm) and stroke (79 mm instead 75 mm). Connecting rods length is the same, but the compression height of pistons is shorter by 2 mm (30.7 mm instead 32.7 mm). These changes give 2.5-liter displacement in the result.
The first generation of EJ25, EJ25D engine, has the DOHC aluminum cylinder heads with four valves per cylinder. Camshafts are driven by timing belt as well as each EJ motor. The power of EJ20D is 155hp at 5600rpm, but from 1997 it got new pistons, and its power output rose up to 165hp. This motor was replaced in 1998 by the more modern EJ251 engine. EJ251 motor has SOHC heads, new pistons and higher compression ratio (10.1:1). The EJ252 engine was built for California State especially; it has another intake manifold and throttle valve for reducing emissions.
The EJ253 is another version of the EJ25 which appeared in 1999. This engine is equipped with MAF-sensor and Tumble Generator Valves in the intake manifold. From 2006, this engine was fitted with the i-AVLS system, which changing the intake valve rising. The EJ253 was tuned again in 2009 - light pistons and headers, plastic intake manifold and new plugs.
The EJ254 continued the history of EJ25D from 1998. It has DOHC cylinders heads also and AVCS system on the intake camshafts. The naturally aspirated 2.5-liter engine began replacing new FB25 motors from 2011.
The EJ255 is a turbocharged version released in 2004 as the engine for the Forester. 2005-2006 Impreza WRX and Legacy models also were equipped with the EJ255. Th? first generation of EJ255 has open deck short block, and DOHC heads AB650s with variable valve timing system AVCS on the intake camshafts. The compression ratio is 8.4 (2004-2006 STI engine has 8.2:1 compression ratio). The engine has TD04L turbocharger produced 0.8 bars. The output of this configuration is 210 hp at 5600 rpm.
The second generation of the EJ255 is used in the 2006-2008 WRX, the 2007+ Legacy, and the 2006+ Forester. It uses a slightly different cylinder block and cylinder heads.
JDM Forester STI used VF41 turbocharger, WRX III - VF52 (0.92 bars). The Legacy GT up to 2009 used VH46 (0.96 bars, 250 hp at 6000 rpm). After 2009, the Legacy GT engine uses VH46 turbocharger produced 0.82 bars and 265 hp.
The EJ257 is one more Turbo version specially designed for WRX STI. The engine had DOCH cylinder heads, 16 valves and based on semi-closed cylinder block (2004-2006 EJ257 shared the same EJ255 block). The engine equipped with AVCS system on the intake camshafts, turbocharger IHI VF48 (1 bar), DBW, and pistons for compression ratio 8.0:1. The output is 280 hp at 5600 rpm. STI model in the USA used IHI VF39 turbocharger, and the power is different, 04-07 models - 293 hp and for 08-16 is 305 hp. WRX STI III EJ257 engine has 8.2:1 compression ratio, AVCS on the intake and exhaust camshafts. The power of this engine is up to 300 hp at 6000 rpm, and torque is 300 lb-ft (407 Nm) at 4000 rpm.
Gunma Oizumi Plant
Cylinder block material
Cylinder head material
Type of internal combustion engine
Four-stroke, naturally aspirated and turbocharged versions
9.5 (EJ25D 1996)
9.7 (EJ25D 1997-1999)
Torque, lb ft
140 lb-ft (190 Nm)/2,800
162 lb-ft (220 Nm)/4,000
167 lb-ft (226 Nm)/4,400
166 lb-ft (225 Nm)/4,000
176 lb-ft (238 Nm)/2,800
298 lbs (135 kg)
Engine oil weight
0W-30, 5W-30, 5W-40, 10W-30, 10W-40
Engine oil capacity, liter
4.0 (EJ25D, EJ25 2007+);
Oil change interval, mile
Subaru Impreza, Impreza WRX STi, Subaru Forester, Subaru Legacy/Outback, Subaru Baja, SAAB 9-2X,
EJ25 Engine Problems and Reliability
The EJ25 2.5-liter engine has the same two-liter engine problems. You can read about them here.
How much does an ej22 weigh?
|Engine weight||265 lbs (120 kg)|
|Engine oil||10W30, 10W40, 5W30 (low winter temperatures)|
|Engine oil capacity, liter||4.5|
|Oil change interval, mile||9,000 (15,000 km) or 12 month|
Click to see full answer.
People also ask, how much does an ej25 weight?
Just the engine(EJ25). A short block with pistons - crank weighs 53lbs.
Additionally, what is an ej22 engine? Subaru EJ22/EJ22T/EJ22G 2.2L Engine Review. The 2.2-liter engine was released in 1990 as the engine for new Subaru model - Legacy. The 1.8-liter engine EJ18 expanded the EJ family. The engine is four-cylinder boxer gasoline engine with the aluminum cylinder block and cast iron sleeves installed inside.
Considering this, how heavy is a Subaru engine?
Thanks. The bare short block shipping weight is about 110 lbs, the bare heads (no cams, with valves and springs) weigh about 45 lbs for the pair. Add oil pan, oil , coolant, intake manifolds, exhaust manifolds, accessories like alternator, fuel injectors etc.
Is the ej22 an interference engine?
Unlike the 2.5, the 2.2 engine is not an interference engine. If the belt breaks or jumps timing, the engine probably will not sustain any internal damage.
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Weight ej25 engine
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