dark_thorns Posted January 21, 2013 Share Posted January 21, 2013 How would i go about increasing my compression ratio? The only things i can think of is to stroke it...lol that just made me laugh. but on a serious note, any suggestoins? Link to comment Share on other sites More sharing options...
subikid90 Posted January 21, 2013 Share Posted January 21, 2013 Lots of ways to... Pistons Rods Crank Heads -Subikid90 1997 Legacy GT 5spd & EJ251 w/EJ25D heads ~10.5CR 1998 Legacy GT Limited waiting for EJ22T hybrid swap Link to comment Share on other sites More sharing options...
monkeyposeur Posted January 21, 2013 Share Posted January 21, 2013 Shorter timing belt? Link to comment Share on other sites More sharing options...
spooln30 Posted January 21, 2013 Share Posted January 21, 2013 May I ask why? For the amount you would spend on getting it done right you would have 1/2 the HP if you were to just get a turbo engine. Link to comment Share on other sites More sharing options...
dark_thorns Posted January 21, 2013 Author Share Posted January 21, 2013 how much of an increase could i push out of both a 2.2 and a 2.5 with those upgrades? a turbo just doesn't suit my car for my driving style. Link to comment Share on other sites More sharing options...
SpecBamf41 Posted January 21, 2013 Share Posted January 21, 2013 like full out, balls deep in a na build you could get gains of 70-100 hp, but thats a complete rework of the entire engine and a standalone. and 2-4 grand. BNR18g on 93oct Link to comment Share on other sites More sharing options...
DOHCEJ22E1 Posted January 21, 2013 Share Posted January 21, 2013 Thinner head gasket would be a start. Link to comment Share on other sites More sharing options...
whitetiger Posted January 21, 2013 Share Posted January 21, 2013 how much of an increase could i push out of both a 2.2 and a 2.5 with those upgrades? a turbo just doesn't suit my car for my driving style. unless you are going to severely raise your CR (13:1)with a full build with cams and a tune for c16 so you dont detonate, you arent going to see anything substantial like you would with a turbo install and you will spend more than the equivalent turbo install. most n/a subaru builds get around 200 crank HP. thats with all bolt-ons, p/p everything, spacers and cams with the right tune. its just not worth the $$$. Link to comment Share on other sites More sharing options...
97gtb Posted January 21, 2013 Share Posted January 21, 2013 As above, you could do thinner headgasket, there may be some head that you can swap with as well but you may have valve clearance issues. Really you need longer stroke on the crank, longer rods or taller pistons.. bringing the CR up to give you some more bottom end then using cams to bring the power further up the rev range and then do some head work to get a higher rev limit (but there may be things that start failing at that point such as oil pump etc). With all that money, you will have much much better value for money from a turbo engine swap, you would probably even have some left over to tweak the setup to give you N/A-like response. Link to comment Share on other sites More sharing options...
dark_thorns Posted January 22, 2013 Author Share Posted January 22, 2013 so is there any way to build it to atleast a 15:1 compression ratio? Link to comment Share on other sites More sharing options...
97gtb Posted January 22, 2013 Share Posted January 22, 2013 so is there any way to build it to atleast a 15:1 compression ratio? diesel conversion? Link to comment Share on other sites More sharing options...
subikid90 Posted January 22, 2013 Share Posted January 22, 2013 so is there any way to build it to atleast a 15:1 compression ratio? Yes you will need about $15000. Custom pistons will do the trick. But you will need upgraded rods, cams, valves, springs, bearings, transmission, standalone, race fuel and a new block. -Subikid90 1997 Legacy GT 5spd & EJ251 w/EJ25D heads ~10.5CR 1998 Legacy GT Limited waiting for EJ22T hybrid swap Link to comment Share on other sites More sharing options...
SpecBamf41 Posted January 22, 2013 Share Posted January 22, 2013 Lmao. The new Brz has 12:1 and they had to add direct injection to do so and still be pump gas friendly. Good luck getting stable combustion at 15. You'd have to convert to diesel. Sent from my SCH-I800 using Tapatalk 2 BNR18g on 93oct Link to comment Share on other sites More sharing options...
dark_thorns Posted January 23, 2013 Author Share Posted January 23, 2013 diesel conversion? yup. after reading about the subaru legacy 2.0D i decided to see what it would take to theoretically convert a subaru motor to diesel. Link to comment Share on other sites More sharing options...
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