[smokedblack16v]

Hello,

Thanks for the add I just picked up my first Forester. the body is in decent shape, enough for me to look into things to modify. With that said obviously the xs is slow.

So I have tried to do all the reading I could before making this post so here are a few questions I had before i continue researching.

1: can a piggy back ecm run a turbo'd engine in the xs or is the XT harness( and corresponding parts) still needed
2: I have seen quiet a few threads with guys boosting turbo and none turbo blocks but running an sti crank and rods was the common denominator in those threads.... Im not looking for 400hp so would putting an sti crank,rods and pistons be ok for 200-250 at the wheels?
3:The xs trans... If i run a TQ converter from an XT will that be alright?

Im sure im missing something but thats a good start.

thanks

 

[smokedblack16v]

well i appreciate the help.

 

[leland grant]

not everybody can respond all of the time, changing depends on how you would control fuel and boost pressure from a turbo, electronically thru the ecu or simple pop off valve, a turbo needs more fuel, so more powerful pump, and injectors and fuel pressure regulator, turbos run hotter, so better cooling system, different maf and or map settings, , i would personally use a higher flow oil pump too, consider higher heat resistant valves,[ i cant remember if stock non turbo valves are good enough] the head gaskets are different, the way the heads bolt on are some different too, , replacing the current engine with a turbo engine can be done, but Subaru wiring is complex and usually all new wiring, must be used and a turbo ecu too, - if you just want more power, but a simpler system, then you do it the way all other cars have done sit for decades, different cam profiles machined or new cams, bigger fuel supply [ injectors and pump[ different tuning for the ecu software, higher flow air system, , not that hard to get 50 to 75 more hp, and most subaru transmission are not really good for more than 350 hp