This engine uses IHI VF48 turbocharger, its maximum boost pressure is 14.5 psi (1 bar). 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. Subaru Impreza WRX STI had EJ257 engine with semi-closed deck block. Such Legacy GT developed 265 HP at 5,600 rpm, and engine torque 350 Nm at 2,400 rpm. 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.Ģ009+ Legacy GT had VF45 turbocharger, its boost pressure was 12.5 psi (0.87 bar). Subaru Legacy GT (till 2009) had VF46 turbocharger. Subaru Impreza WRX III has VF52 turbocharger, with the maximum boost pressure 13.3 psi (0.92 bar). VF41 turbocharger is applied to EJ255 which is installed on JDM Forester STI. It allowed to receive the power 230 HP at 5,600 rpm. Due to all this, Subaru EJ255 shows 210 HP at 5,600 rpm.Īlso there is EJ255 version with the increased intercooler and with maximum boost pressure 13.5 psi (0.93 bar). Maximum boost pressure is 11.5 psi (0.8 bar). The compression ratio was reduced to 8.4 on EJ255 and TD04L turbocharger was applied. This turbocharged motor had semi-closed deck block, DOHC heads and variable valve timing system AVCS on intake cams. Subaru EJ255 engine was applied for Forester, Impreza WRX and Legacy (2004-2005). EJ254 motor used variable valve timing system AVCS on intake camshafts. It is a direct successor of EJ25D and refers to Phase 2. In 1998 they started production of EJ254 engine which used DOHC heads. Now we will examine engines with DOHC heads. 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. Since 2006, they began to apply variable valve lift system i-AVLS, on the intake side. It differs in MAF sensor, and also intake manifold which uses Tumble Generator Valves. Since 1999 Subaru started producing EJ253 engine. EJ252 differs in intake system, throttle body and the placement of idle air control valve and MAP sensor. In the State of California you can find EJ252 engines, meeting the advanced environmental standards. Also new moly coated pistons were used, and compression ration was increased to 10.1. This motor was used for Subaru till 1998, then it was replaced by EJ251 engine.ĮJ251 belongs to Phase 2 and it used new SOHC heads, one camshaft for each. In 1997 pistons were modified, and power increased to 165 HP. The timing belt replacement is necessary for each 50,000-60,000 miles of mileage (90,000-100,000 km). The first variant of EJ25 Phase 1 was called EJ25D and it used DOHC cylinder heads with 4 valves on the cylinder. Due to all this it was possible to get 2.5 liters capacity. The rod length remained the same 130.5 mm, and piston compression height decreased to 30.7 mm. It contained the crankshaft with a piston stroke 79 mm. 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). Subaru EJ25 engine used the aluminum cylinder block with dry sleeves. It was widely applied in all main car models. This engine was produced since 1995 and was the biggest engine of the EJ family. Subaru EJ25 engine reliability, problems and repair Normal engine operating temperature, ☌ (F)
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