derrickmd18 Posted October 7, 2009 Share Posted October 7, 2009 HI forum. I'm getting a 98 subaru legacy and i want to either drop in a sti motor or turboing a 2.5 motor. Pretty much i'm going to do a drop because the existing motor has 200K on it and i'm getting another motor and building it for performance. I'm trying to keep swapping time to a somewhat minium so looking to see all I need before I get to taking the car apart and everything. I have past experence with vw motor used to have a vw scirocco turbo 16v on 10:1 compression running TEC2 management. here is a few questions I have: i know the sti motor is a drop in but what about the wiring? what has to get changed and what other parts do I get besides a complete motor?If I do turbo a 2.5 motor what has to be done ECU wise to run the turbo?How much HP can the drive train hold?exhaust. is there a kit or can the factory legacy exhaust work of I do sti?fuel what are you'll doing about fuel? can the stock pump support the wrx are are you'll using another pump? Link to comment Share on other sites More sharing options...
rao Posted October 7, 2009 Share Posted October 7, 2009 go to http://www.nasioc.com and the "Subaru Conversions" sub-forum - it has all of the information you will ever need. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
jamal Posted October 8, 2009 Share Posted October 8, 2009 yeah. this is a good start: http://forums.nasioc.com/forums/showthread.php?t=1486051 Link to comment Share on other sites More sharing options...
one bad bg Posted October 13, 2009 Share Posted October 13, 2009 i cant find the thread, but it was explained about the wiring when doing this. subarus are not like, lets say a honda, where you have a wiring harness and computer that runs the engine, and a separate harness and computer that runs the car itself. thats why is so easy to swap a civic engine with a prelude. subarus have one computer and one harness for the car and the engine. and wrx's have different sensors and such, then a legacy. so its not just take the old out, put the new in, and retune. i have acually seen a wrx motor put into an 05 legy, and it was a wiring nightmare. and they had to have an onboard computer separate from the ecm to run it. its not easy and it takes a lot of wiring troubleshooting. your best bet would be to buy an 05 lgt motor and tranny, and swap that with yours. and thats not saying that it will be take out and put in. theres still gonna be some converting to do, but not nearly as bad as a wrx swap. and as far as the power a stock legy drivetrain can handle, im pretty sure its about 250hp before you have problems Link to comment Share on other sites More sharing options...
eekay Posted October 13, 2009 Share Posted October 13, 2009 If you do a swap, you will most definitely need to do a transmission and a full ECU swap. This, as mentioned above, can be quite a hassle. Of course, it all depends on who is doing this swap and how many helpful heads will be around during the swap. If you turbo an EJ25 N/A motor, you will need to keep the boost below 8psi (recommended 6psi for full safety) but it will boost the HP to about 100 over current. So, a stock EJ25 boosted at 6psi will produce about 265-270 HP (around 210-220 at the wheels.) This is a very simple thing to do but will only provide you with a little extra "umpf." If you aren't going to be satisfied with that much HP, you should avoid the EJ25 turbo mission. However, if you feel that will be adequate, you will need a piggy-back for the ECU in order to run the turbo efficiently and prevent engine damage. I am using a Perfect Power SMT-6 piggy-back and it's great. The stock BD/BG EJ25 drivetrain can put up with roughly 300 HP before you begin breaking stuff. Hence the reason you would need to do a tranny swap if you plan on producing lots of power. For the most part, a factory exhaust will work fine with an STi swap. However, there will be a tiny amount of modification where the down-pipe meets the cat(s)/cat-back exhaust. This shouldn't pose much of a problem though. You can do it yourself or have a shop do it for a minimal amount of cash. The stock fuel pump will be able to provide an STi engine with an efficient amount of fuel to run it. However, an STi fuel pump (which isn't too difficult to find and swap out) is highly recommended as it will most definitely provide enough fuel to run your swapped engine and allow for full fuel transfer. Also, if you plan on upgrading your injectors (and you should ) you will NEED at least an STi fuel pump. At that point though, you might as well just go balls out and do an E85 conversion... Hope that helps! My 9.3 cups EJ22 makes me feel like my **** is 2.8 decimeters! Link to comment Share on other sites More sharing options...
one bad bg Posted October 14, 2009 Share Posted October 14, 2009 hey eekay... where did you get that programmer from, ive been looking everywhere for one. im not turbod, but i would like to change some fuel curves to get rid of my gas miliage tune Link to comment Share on other sites More sharing options...
eekay Posted October 14, 2009 Share Posted October 14, 2009 The piggy-back came with my AVO turbo kit. However, you can still buy them from Perfect Power directly ( http://www.perfectpower.com/products/smt6.asp .) They're phasing them out to make room for the SMT-8 too. I have no experience with the SMT-8 so I'm not sure if waiting is the best idea or not. But, the SMT-6 should provide you with whatever you're looking to do. Good luck! My 9.3 cups EJ22 makes me feel like my **** is 2.8 decimeters! Link to comment Share on other sites More sharing options...
one bad bg Posted October 15, 2009 Share Posted October 15, 2009 ^ website is down. not for maintenance. it was comming up with an error like the website doesnt exist anymore Link to comment Share on other sites More sharing options...
eekay Posted October 15, 2009 Share Posted October 15, 2009 Hrm. Seems to work fine for me. Anyone else having problems visiting perfectpower.com? My 9.3 cups EJ22 makes me feel like my **** is 2.8 decimeters! Link to comment Share on other sites More sharing options...
one bad bg Posted October 18, 2009 Share Posted October 18, 2009 now its working Link to comment Share on other sites More sharing options...
05lgt5spd Posted October 18, 2009 Share Posted October 18, 2009 sell it and get the right car. These aren't like hondas, unfortunately they aren't plug-and-play friendly Link to comment Share on other sites More sharing options...
one bad bg Posted October 18, 2009 Share Posted October 18, 2009 ^+1 Link to comment Share on other sites More sharing options...
eekay Posted October 22, 2009 Share Posted October 22, 2009 Eh. I would have to disagree to an extent. Providing you have the money to spare, an STi swap into a BD/BG chassis would be much cheaper (and MUCH more awesome) than simply trading it in for an STi. Plus, what's cooler than a LegaSTi?! My 9.3 cups EJ22 makes me feel like my **** is 2.8 decimeters! Link to comment Share on other sites More sharing options...
one bad bg Posted October 22, 2009 Share Posted October 22, 2009 Eh. I would have to disagree to an extent. Providing you have the money to spare, an STi swap into a BD/BG chassis would be much cheaper (and MUCH more awesome) than simply trading it in for an STi. Plus, what's cooler than a LegaSTi?! because a legacy sti has already been produced, they only made 500 of them but still, their out there somewhere Link to comment Share on other sites More sharing options...
eekay Posted October 23, 2009 Share Posted October 23, 2009 Not with a BD/BG body though! Not production anyhow. My 9.3 cups EJ22 makes me feel like my **** is 2.8 decimeters! Link to comment Share on other sites More sharing options...
one bad bg Posted October 23, 2009 Share Posted October 23, 2009 http://cache.jalopnik.com/assets/resources/2008/05/Subaru_Legacy_STI_S_402.jpg Link to comment Share on other sites More sharing options...
eekay Posted October 23, 2009 Share Posted October 23, 2009 That's a BP, bro. Not a BD. My 9.3 cups EJ22 makes me feel like my **** is 2.8 decimeters! Link to comment Share on other sites More sharing options...
one bad bg Posted October 23, 2009 Share Posted October 23, 2009 oh, haha, sorry, i dont know all the vin codes that are relative with the years oops Link to comment Share on other sites More sharing options...
eekay Posted October 23, 2009 Share Posted October 23, 2009 No problem. I do love those BP STi's though. My 9.3 cups EJ22 makes me feel like my **** is 2.8 decimeters! Link to comment Share on other sites More sharing options...
derrickmd18 Posted October 24, 2009 Author Share Posted October 24, 2009 well here is what i'm planing to do. i'm going to swap the wrx turbo parts over to the legacy and use emanage ultimate and just drive it. later i'll be rebuilding a spare motor with sti pistons and rods and crank in a 2.5N/A block then swapping the trans to manual and turning up the boost. Link to comment Share on other sites More sharing options...
eekay Posted October 26, 2009 Share Posted October 26, 2009 well here is what i'm planing to do. i'm going to swap the wrx turbo parts over to the legacy and use emanage ultimate and just drive it. later i'll be rebuilding a spare motor with sti pistons and rods and crank in a 2.5N/A block then swapping the trans to manual and turning up the boost. A 2.5 N/A block will, without any doubt, blow a piston wall the moment you boost over 8psi. It's recommended to only boost 6psi to a 2.5 N/A block. Otherwise, your work will be fruitless. My 9.3 cups EJ22 makes me feel like my **** is 2.8 decimeters! Link to comment Share on other sites More sharing options...
one bad bg Posted October 26, 2009 Share Posted October 26, 2009 A 2.5 N/A block will, without any doubt, blow a piston wall the moment you boost over 8psi. It's recommended to only boost 6psi to a 2.5 N/A block. Otherwise, your work will be fruitless. not even that. these 2.5 engines are so frail. i had a guy give me a richer tune, i noticed a huge difference in the torque but a month later i cracked a cylinder wall Link to comment Share on other sites More sharing options...
eekay Posted October 26, 2009 Share Posted October 26, 2009 Well, I successfully ran 6psi of boost for a long time without any issues at all. Granted, I didn't beat the piss out of it either. My 9.3 cups EJ22 makes me feel like my **** is 2.8 decimeters! Link to comment Share on other sites More sharing options...
one bad bg Posted October 26, 2009 Share Posted October 26, 2009 oh that was cold:redface:. i dont really. a few off roading adventures, 1 unorganized rallyx at a badass spot. i will admit though when i first got it i did beat the crap out it cause it is the 2nd fastest car ive owned. i dont know if you followed me on one of the previous threads but ive always had cars classified under low'n'slow. my fastest car was a second gen rx7 that was built pretty well. but since i blew this motor last november ive been pretty nice to it. Link to comment Share on other sites More sharing options...
eekay Posted October 27, 2009 Share Posted October 27, 2009 Haha. I didn't mean it that way at all actually. I just meant generally speaking I don't beat the piss out of my car. I was in no way stating that you personally beat your car up. Lol. My 9.3 cups EJ22 makes me feel like my **** is 2.8 decimeters! Link to comment Share on other sites More sharing options...
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