Solving Subaru EJ Oiling Issues for Good with IAG Performance!

The IAG Windage tray strips the oil cloud off of the rotating crank assembly and returns it quickly to the pan.  This helps free up some power, reduces oil temperature, keeps the oil in the pan level high, and helps reduce the oil puked out of the breathers.  The windage tray is made from stainless steel.

The IAG pan baffle is a work of art.  Boxer engines tend to puke oil out of the breathers because, in corners, the oil can slosh up and be flung by the crank right into a churning cylinder bank. The IAG baffle not only has vertical baffles with many Viton rubber trap doors but a top baffle with a whole bunch of Viton trap doors that help prevent the oil from getting near the crank.

Viton is a synthetic rubber that is very heat and oil resistant.  Oil can travel down into the sump but not up into the top end of the engine.  The baffle itself is made out of stainless steel.

You can see the many trap doors that will keep oil around the pickup to maintain pressure even in hard cornering.  To do better you will need an expensive dry-sump system!  Unlike other baffles, the IAG part is not sandwiched in between the pan and the cases but set lower in the pan.  The windage tray does the scavenging and the horizontal baffle has an engineered clearance all around its edge with the pan itself that acts like additional drain backspace.  A sandwiched baffle can allow oil to pool on it which in turn can cause more windage and more oil expelling from the breathers.

A big part of fixing the EJ’s oiling issues is their heavy-duty oil pick-up.  The EJ OEM pickup is super weak and is notorious for suddenly failing leaving you with no oil pressure.  We know of two cars that have lost engines due to pick-up failure, one on the track and another on the street.  The ID of the OEM pickup tube is small and can also lead to pump cavitation.  IAG has come up with a solution to fix these issues for good.