USDM '04 STI EJ25 VS. USDM Forester XT EJ25, what is the difference
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USDM '04 STI EJ25 VS. USDM Forester XT EJ25, what is the difference
Okay I am about to pick up a EJ25 Forester XT engine to transplant into my 1998 2.5 RS, and I wanted to know what the difference is between the XT and the STI engine. I am basically refering to internals since I know the turbo/ intercooler differences that exist.
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Originally Posted by keirnna
Okay I am about to pick up a EJ25 Forester XT engine to transplant into my 1998 2.5 RS, and I wanted to know what the difference is between the XT and the STI engine. I am basically refering to internals since I know the turbo/ intercooler differences that exist.
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It appears that the shortblock is 100% the same. Longblock is near the same...maybe some minor differences.
http://forums.nasioc.com/forums/show...t=forester+sti
http://forums.nasioc.com/forums/show...t=forester+sti
http://forums.nasioc.com/forums/show...t=forester+sti
http://forums.nasioc.com/forums/show...t=forester+sti
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Yeah...it was a good move on SOA to have a near identical block used in multiple cars. Parts, availabity, and cost wont be as big of an issue for us since the block is more common.
Good luck with your swap. Are you going with bigger injectors, turbo etc?
Good luck with your swap. Are you going with bigger injectors, turbo etc?
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Originally Posted by BAN SUVS
In a nutshell, differences are turbo, uppipe, intercooler, cams, and ECU tuning. Short block is identical, headcastings are identical.
Mike
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Nothing concrete, just anecdotal. With the different turbos, it would make sense for Subaru to develop seperate cams for emissions and fuel economy purposes, as well as the extra emphasis the Forester has on torque and low boost threshold. I'll make some inquiries. I hadn't yet heard about the casting difference, that suprises me. I can't think of any reason to make changes to those.
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I think the emissions and fuel economy is taken care of by the remapping of the ECU rather than different cam profiling although I am not 100% sure (I can look at the stock mapping tomorrow to see what it shows).
We have a couple of FXT motors at the shop and more importantly one in a car with a vf34 setup (WRX) so when the owner gets through breaking it in we should see how well it performs in comparison to the STI motor (on cars with similar mods).
Mike
We have a couple of FXT motors at the shop and more importantly one in a car with a vf34 setup (WRX) so when the owner gets through breaking it in we should see how well it performs in comparison to the STI motor (on cars with similar mods).
Mike
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