June 13, 201411 yr can i run ej251 (01 forester) heads on my phase 1 ej22e IF i run the 251 intake manifold and engine managment? would cr drop? would the piston kiss the valves? im turboing my 95 legacy ej22 and im stuck on this after searching all over google to no avail.
June 13, 201411 yr It can be done, and yes it will lower compression due to the larger combustion chamber in the phase 2 heads. I've seen it suggested that compression ratio would be between 8.5 and 9.0:1 with that setup, depending on which block you have and how thick of a head gasket you use. Compare that to 9.5:1 compression of the stock setup for that block. The wiring will be tricky. You'll probably want to get the intake manifold, wiring, and ECU for a 99 Legacy EJ22 to keep things as simple as possible for matching up wires in the harness. You could also run an aftermarket engine management system like megasquirt which will make the wiring easier, and provide more tuning ability for a turbo setup.
June 13, 201411 yr Just how adventurous/skilled are you? Because there is always the wrx ecu swap http://www.rs25.com/forums/f105/t199059-diy-wrx-ecu-swap.html
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