IAG Stage 2 CNC Ported EJ25 11mm Oil Pump for 04-21 STI, 02-14 WRX, 05-09 LGT, 04-13 FXT

The 11mm Subaru Oil pump is one of the most popular off the shelf pumps to use on EJ25 engines. Originally equipped on the 2008-21 STI Dual AVCS engines, it provides an adequate amount of pressure and flow that fits the needs of many OE and built engines. But, as with almost anything, there is room for improvement. The IAG Stage 2 CNC Ported EJ25 11mm Oil Pump design allows for increased flow volume and pressure, ensuring that the bearings have a sufficient oil film under all power levels and driving conditions. The additional oil flow to the engine provides a greater oil reserve to operate the AVCS solenoids and cam gears - giving you more consistent performance results.

• Stage 2 flows 11.1% more oil than the OEM 11mm Oil Pump
• Stage 2 flows 9% more oil than the OEM 12mm Oil Pump

• Stage 2 oil pressure is 12.4% higher than the OEM 11mm Oil Pump
• Stage 2 oil pressure is 9.8% higher than the OEM 12mm Oil Pump

Each IAG Stage 2 oil pump starts as an OEM Subaru pump with 11mm rotors. IAG completely disassembles the new oil pump including pulling the rotors, backing plate & pressure relief valve. Next, the main body is fixtured in our in-house 5-Axis Centroid CNC machine where the inlet and outlet passageways are CNC ported. This allows for a larger, more consistent pathway for the oil into and out of the gerotor internals and helps to prevent cavitation. The Oil Pump Outlet where it meets the engine block is also CNC “Port Matched”, for a precise transition into the engine block. The Inlet and Outlet sides of the gerotor are also opened up on the CNC mill to reduce inlet side cavitation, and to reduce outlet side pressure drops.

The pressure relief valve piston is REM Polished, which provides a non-directional, low Ra, polished finish. This reduces friction, heat and possibility of the relief valve piston galling and sticking, a common failure point on the OEM pumps. The piston is reinstalled and confirmed to operate correctly. The rotors are measured and checked to be within the manufacturer's specification - aka Blueprinted, and then installed. The pump is then put together with a light coating of assembly lube to reduce friction and scuffing and aid in priming on first start up. Finally, the backing plate is installed. Loctite is added to the hardware, and each piece receives a painted mark after it is correctly torqued. The pump ships ready to install, with all hardware and seals required for installation.

IAG Stage 2 CNC Ported EJ25 11mm Oil Pump fits all EJ series Subaru engines, including both single and dual AVCS. This pump is a solid option that is capable of providing consistent oil pressure for IAG 750 and modified engines used for street and competition cars. The IAG Stage 2 Oil Pump comes measured, blueprinted and assembled, packed in assembly lubricant and ready to install with all required hardware. The IAG Stage 2 Oil Pump is a cost effective solution that outperforms the market standards.