more gold!
If there's some magical formula on how to properly build an EJ engine, chances are our top tuners have found it! Follow along as they offer a simple how-to guide to help point you in the right direction whether you're planing on building a 300 whp, 400 whp, 500 whp, or 500+ whp engine.
Quirt Crawford Of Crawford Performance
300 whp: To obtain this horsepower level, the EJ motor only requires an upgraded intercooler, larger sized fuel injectors, and a retune of the
ECU-no internal engine modifications are required. We highly recommend the use of an air/oil separator (AOS) on any turbocharged EJ motor to eliminate oil from coating both the intake tract and the inside of the intercooler, which causes a reduction in cooling efficiency that can cause detonation.
400 whp: There are no internal engine modifications needed at this power level. The car would need a larger turbo, intercooler, fuel injectors, fuel pump, AOS, and retune of the
ECU.
500 whp: At his point, we suggest replacing the OE rods with a set of stronger, aftermarket forged rods, along with forged pistons, head studs, and the external components listed under 400 whp.
500+ whp: The same engine components are needed in the 500-whp package but you will probably need a larger turbo, and of course, proper tuning.
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Page 3: The Truth Behind The Subaru EJ-Series Engines - Crawford Performance - Tech-Knowledge - Import Tuner Magazine