Sleeparu Posted July 10, 2004 Share Posted July 10, 2004 Okay... I asked my Subaru dealership this and they were clueless, so I'm hoping someone out there can help me with this! I have a 155hp 1996 Subaru Legacy GT that I'm planning on upgrading... lots of mags with how-tos on the Impreza 2.5RS that I have lots f info... the one thing that nobody can tell me is this: What did Subaru change from the 1996 to 1997 model year to jack the horsepower rating up by 10hp? Can I do this to my engine with relative ease? Thanks all for help! Quote Link to comment Share on other sites More sharing options...
ccrinc Posted July 10, 2004 Share Posted July 10, 2004 Okay... I asked my Subaru dealership this and they were clueless, so I'm hoping someone out there can help me with this! I have a 155hp 1996 Subaru Legacy GT that I'm planning on upgrading... lots of mags with how-tos on the Impreza 2.5RS that I have lots f info... the one thing that nobody can tell me is this: What did Subaru change from the 1996 to 1997 model year to jack the horsepower rating up by 10hp? Can I do this to my engine with relative ease? Thanks all for help! Basically, they went from hydraulic lifters to solid lifters. Piston height may have been an issue too. No, this isn't easy, unless you consider completely changing your heads (at the very least) easy. Emily http://www.ccrengines.com Quote Link to comment Share on other sites More sharing options...
THAWA Posted July 10, 2004 Share Posted July 10, 2004 head replacement is pretty easy time consuming more than anything else. Quote Link to comment Share on other sites More sharing options...
PAezb Posted July 10, 2004 Share Posted July 10, 2004 Did they also go from DOHC to SOHC then, or was that in later models? Quote Link to comment Share on other sites More sharing options...
SkiGuyGT Posted July 10, 2004 Share Posted July 10, 2004 No the '96 and '97 2.5 had DOHC. (Phase I) It is not at all worth the effort to get 165hp, save your money for an '05 GT. Quote Link to comment Share on other sites More sharing options...
Commuter Posted July 11, 2004 Share Posted July 11, 2004 They added the "torque box" in front of the throttle body. That was one thing. I also have a "Shop Talk" somewhere that talks about shortened pistons, moly coating on the pistons, etc. There were some internal changes from 96 to 97. I think they even played with the compression ratio a bit. Commuter Quote Link to comment Share on other sites More sharing options...
wrxsubaru Posted July 11, 2004 Share Posted July 11, 2004 They added the "torque box" in front of the throttle body. That was one thing. I also have a "Shop Talk" somewhere that talks about shortened pistons, moly coating on the pistons, etc. There were some internal changes from 96 to 97. I think they even played with the compression ratio a bit. Commuter Yeah i think they did becasue you only need regular instead of 91 octane gas in the later 2.5s. Quote Link to comment Share on other sites More sharing options...
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