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Old 10-08-2008, 04:03 PM   #1
97LegacyGT2.5
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Legacy Turbo on a non-turbo legacy 2.5

Hi,
I was wondering if anyone out there would know how much work and how much money it would take to put lets say a stock sti turbocharger on a 1997 legacy GT 2.5? I am guessing that the engine is close to the sti engine except with the non turbo having a higher CR and other minor things. How would i go about an ECU/ECM for this? would i need a piggyback system or what?

Thanks
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Old 10-08-2008, 07:00 PM   #2
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I feel like you're going to get flamed like mad; but let me first say, that as a newbie, this is an important department. so please guys - take the inquiry seriously.

I'D like to find a subbie flowchart or something; something that CLEARLY shows the changes they made in engine and drivetrain from year to year, and model to model. because I'm going to assume that the legacy 2.5 has smaller rods than the STi. however, how do the rods compare to the impreza RS? from what years? what about the WRX?

this is balls; I just want a boosted AWD vehicle, and I'd rather not do an engine/drivetrain swap on an impreza.

Sim
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Old 10-08-2008, 07:31 PM   #3
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your Legacy is running a DOHC phase 1 ej25. it should be the same engine that was in my 98 Impreza. your heads actually flow better than 02 wrx heads. But your block is pretty much useless for forced induction. People have had luck running at MOST 10 lbs of minimal boost from the wrx turbo (TD04). There is no point in running anything bigger because your drivetrain simply can't handle it anyway.

what are your power goals? what are you going to use the car for ? How much money do you want to spend ?

sti swaps are becoming more and more affordable everyday...and AFI is more for the truly diehard and extreme settups. its just not really worth it for the money....unless your budget is under 2k...

with that said, for 2 grand you can definatly give your car some some balls if driven responsibly. you can build a nice little parts list. or just surf the classifieds for some used kits. check out www.RS25.com

Last edited by IllNastyImpreza; 10-08-2008 at 09:06 PM.
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Old 10-08-2008, 08:15 PM   #4
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a new AVO turbo kit with ECU, piping intercooler lines everything you need brand new is 2.9k. the guys are right if you want to run boost 8lbs max. you can find a franken turbo kit built by someone else like ^^he said on rs25 or here on the classifieds. if you get a franken turbo kit you are going to have to custom fab your uppipe and down pipe's to fit the n/a flanges. i dont know exactly if you can use the 2.5 gt ecu or not..i think you might be able to if you run low boost. you are also going to need bigger injectors. a set of wrx injectors or sti "pinks" i think will do the trick. someone else take on where i left off because i dont know the whole schabang.
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Old 10-08-2008, 08:36 PM   #5
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Old 10-08-2008, 11:55 PM   #6
97LegacyGT2.5
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I dont intend to race or track this car, i just want to give it a little more balls. i was thinking of doing a "franken" turbo kit and possibly find a lightly used or new stock turbo and custom make my own kit. i have found almost all the parts i would need from ebay( they are ebay stores not random people) so far i have found a turbo, TMIC w/fittings and piping, header /with up-pipe (that i believe will fit), and i found a turbo back exhaust system. I just have to find injectors (which shouldnt be that hard), find out what to do with the ECM/ECU, and any other parts i need to address.

Another question would i have to change the compression ratio on my stock engine to run around 8psi of boost or would it run poorly?

Thanks
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Old 10-09-2008, 11:31 PM   #7
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I would just swap in an EJ22 block to lower your comp. ratio if I were you. That would bring you down to ~9.0:1 CR, down from your stock 9.7:1. Which allows a bit more room for mistakes on your part.


~Josh~
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Old 10-10-2008, 03:44 AM   #8
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Quote:
Originally Posted by ballitch View Post
I would just swap in an EJ22 block to lower your comp. ratio if I were you. That would bring you down to ~9.0:1 CR, down from your stock 9.7:1. Which allows a bit more room for mistakes on your part.


~Josh~
dude ej22 blocks still have garbage rods that will SNAP in 3 seconds...

If you are going to all the trouble of pulling your engine. at least trade it for an sti block. you will NOT be disapointed. those things are PROVEN.

as far as EM goes. do you have to pass inspection ? if NOT then a standalone ALL the way. you can pick up a used LINK plus for CHEAP. IF you DO have to pass inspection, than an emanage ultimate is your best bet. It will do 97% of EVERYTHING the best standalone offers, for MUCH less money and hassle...and you will still be able to pass inspection
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Old 10-10-2008, 06:35 PM   #9
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do this... get slightly thicker ceramic head gaskets that will lower your compression ratio... then you can run a moderate boost. your engine was not designed for it but as long as you dont run lean, you will be fine. get an upgraded fuel pump and injectors to say the least. the top mount will help out a lot! also get a tune. dont even drive it to the tuning shop... tow it.

personally if i were you, i would go rotated and use a garrett t3/t4 stage 3 turbo... they are used on civics, scions, and other N/A engines. they are usually oil cooled so you dont have to worry about getting coolant to the turbo and making a oil feed line will take $30 for a steel braided line that goes from the block to your turbo and just make a custom return tube in your oil pan. simply take the car to a muffler shop with the t3/t4 (3-400 bucks on ebay... im actually selling one too) and show them pictures of the many many rotated setups on the internet and tell them you want these pipes made. perrin will rape you for everything you have if you ask them for the pipes. just try and get the measurements and have the up pipe and down pipe made, get an external wastegate and a boost controller and you are pretty much set. i can show you to a company that will make the kit for you for around 1800.00

third option is to get jdm legacy exhaust parts, as well as turbo and just run lower boost
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Old 10-10-2008, 06:57 PM   #10
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Quote:
Originally Posted by IllNastyImpreza View Post
dude ej22 blocks still have garbage rods that will SNAP in 3 seconds...
Then why havent I EVER snapped one? 300whp out of one 2.2....

Of course I was always using 90-94 rods..
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Old 10-12-2008, 10:54 PM   #11
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Quote:
Originally Posted by mannyOlicious View Post
do this... get slightly thicker ceramic head gaskets that will lower your compression ratio... then you can run a moderate boost. your engine was not designed for it but as long as you dont run lean, you will be fine. get an upgraded fuel pump and injectors to say the least. the top mount will help out a lot! also get a tune. dont even drive it to the tuning shop... tow it.

personally if i were you, i would go rotated and use a garrett t3/t4 stage 3 turbo... they are used on civics, scions, and other N/A engines. they are usually oil cooled so you dont have to worry about getting coolant to the turbo and making a oil feed line will take $30 for a steel braided line that goes from the block to your turbo and just make a custom return tube in your oil pan. simply take the car to a muffler shop with the t3/t4 (3-400 bucks on ebay... im actually selling one too) and show them pictures of the many many rotated setups on the internet and tell them you want these pipes made. perrin will rape you for everything you have if you ask them for the pipes. just try and get the measurements and have the up pipe and down pipe made, get an external wastegate and a boost controller and you are pretty much set. i can show you to a company that will make the kit for you for around 1800.00

third option is to get jdm legacy exhaust parts, as well as turbo and just run lower boost

What company is that? that could make the kit??
thanks
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Old 10-13-2008, 12:35 PM   #12
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turbo performance... they will be your cheapest bet.

www.turbo-performance.com

might want to call as they are unresponsive with emails...lately at least
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Old 10-13-2008, 11:10 PM   #13
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ok thank you
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Old 10-14-2008, 12:11 AM   #14
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yeppp
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Old 10-17-2008, 09:01 PM   #15
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Quote:
Originally Posted by reddevil View Post
Then why havent I EVER snapped one? 300whp out of one 2.2....

Of course I was always using 90-94 rods..
Red you never snapped a rod ??? I find that hard to believe if not, thats crazzy. I remember hearing of quite a few folks back in the day with hybrid builds having Rod snap issues even before their wonderfull subaru 5mt broke...

the Gen 1 rods IIRC are completely different also... same as the ej22t rods IIRC.
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Old 10-19-2008, 02:08 PM   #16
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i dont want to think about rods snapping
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Old 10-19-2008, 08:47 PM   #17
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Quote:
Originally Posted by IllNastyImpreza View Post
dude ej22 blocks still have garbage rods that will SNAP in 3 seconds...

If you are going to all the trouble of pulling your engine. at least trade it for an sti block. you will NOT be disapointed. those things are PROVEN.



And I bet an STi block is alot cheaper than a set of aftermarket forged rods right?.....

You DONT have to HAVE an STi block to turbo your car. I am sure that you have seen turboL's builds, look what he did with his EJ18, that has the same garbage rods, and crank, as the EJ22E.



~Josh~
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Old 10-20-2008, 12:25 AM   #18
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^ not knockin those guys using it, cuz yes they will outlast the stock NA ej25 rods by a longshot. But if you are gonna change your engine at ALL, the sti block is the easier/most simple way to go for lower end reliability.
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Old 10-20-2008, 12:32 AM   #19
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It also comes down to how much power your want. 250 whp or less (which some consider a great, some consider squat), stock oem parts (minus pistons) will perform fine.
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Old 10-20-2008, 01:03 PM   #20
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any updates?
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Old 12-24-2008, 02:10 AM   #21
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Legacy

I have found an AVO 2.5 turbo kit used for the 93-01 impreza. It looks like it will bolt up to my stock headers and fit in my engine compartment. I am wondering if this is worth it if i get my engine rebuilt(most likely rebuilding it because of bad oil rings in No.4 Cyl) and when i rebuild it put forged pistons in and thicker head gaskets to lower the compression ratio slightly and be able to hold the boost. I will have most likely have my engine rebuilt in the near future, then when i get the money and time install the turbo kit.
http://www.rallitek.com/avo25tukitwi.html
Does this make sense? will it work?

Would i have to change from MAF sensor to MAP sensor? and how hard is that?

Thanks
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Old 12-24-2008, 09:36 AM   #22
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hey smARTY PANTS EARLY SUBARU RODS R' the same! and they were forged rods=GOOD! and why are you smack talking the crank... it is awesome and designed to withstand 10 ton of force! (http://www.carforums.net/showthread.php?t=11289)

Last edited by leftho0k; 12-24-2008 at 09:41 AM.
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Old 12-24-2008, 09:38 AM   #23
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and #4 is the hottest cyl. and the problem gspot for mostboosted ej's
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Old 12-24-2008, 01:06 PM   #24
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why not change your crank out for the phase 2 crank (52mm journal) and run stock sti rods with stock sti pistons for a budget build??? theres even a shortblock in the classifieds thats a phase 2 sohc shortblock thats built with internals from an sti and you could bolt your heads on and go. one of my good friends used a phase1 dohc and build it with sti internals and all he had to do was swap cranks to the phase 2 crank....just throwin it out there
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Old 12-24-2008, 09:39 PM   #25
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so the short block on the classifieds is from an STI sohc? dohc heads would work on the block if i am not mistaken correct? i would have to reuse all my pullies and accessories correct?

Would you be able to send me a link to the post on the classifieds?

Thanks
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