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Old 12-23-2003, 03:56 PM   #1
Soon2BturbodRS
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Default 99 Ej22>ej25

Hey all... I am contemplating an EJ25 swap into my 1999 OBS (2.2L SOHC, MAF-based, single-port header)... Who has done this (or similar to it)? I seem to be reading a lot more about EJ20 swaps but very rarely do I come about an RS engine swap. What all do I need (as specific as possible)? Is there anywhere this swap has been documented?

And yes, I've searched on here... looked thru every single reply and every link off of those... not the info I was looking for.

Thanks in advance for any help
-Ben
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Old 12-23-2003, 04:20 PM   #2
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You might have some luck viewing the 2.0 Turbo board, there's been a ton of USDM STi swaps over there.


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Old 12-23-2003, 05:35 PM   #3
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Ahh... I wish I had the money to do an STi swap... I'm talking about a NA EJ25 into my '99 OBS.
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Old 12-24-2003, 02:57 AM   #4
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BUMP! I need some cold hard facts on what and how!
Thanks
-Ben
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Old 12-24-2003, 03:05 AM   #5
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are you just staying NA or are you soon2Bturbod?

edit: since you are also a Ben, i will assume you are smart and are turbocharging your vehicle

for FI definitely go for the EJ22T, and i know someone said to swap in a whole sti engine but why not go for just the shortblock? that is also a very good route, WITH proper management and fuel you should be able to run 25psi on that block no worries. that still may be a bit much for some people, if so, def do the 2.2T, you can get full engines for like 300 dollars, and swap over the heads, those can definitely run 25psi as well with proper setup.

stay away from the 2.5 NA engine, it can be done properly but even then i wouldnt advise running over 9psi daily, and thats also with expensive engine management and extra fuel.

basically the other two options are much better, and there is a lot of support with the ej22T swap, apparently i have heard it is not too bad, besides wiring.

good luck

Ben

Last edited by PHATsuby; 12-24-2003 at 04:06 AM.
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Old 12-24-2003, 08:04 PM   #6
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Hey Ben, how you been?

Yeah, I'm not sure. I'm thinking of buying a slightly modded RS, doing an EJ22T block swap, standalone ems, and turbo'ing it.

I would really love to go the turbo route on the OBS but it has 108k miles (almost) and I'll have to do it in stages... like... buy turbo, s-afc, and misc. necessities... then later, get a J&S, and then after that, do a block swap. With the way my money has been coming in, I won't be able to do step 2 for a few months, and then I'll be able to do the rest of the steps at one time... Idk... WAITING ON PROJECTS TO CLOSE SUCKS! Oh well, for now I just have to grin and bear it (or bare it, not sure... it's xmas break, I shouldn't be thinking so hard ).

Happy holidays and take it easy all
-ben
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Old 12-24-2003, 08:07 PM   #7
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bah. ej22t? ner. sucks. why put a POS SOHC 160PS motor with baad heads in your car. the shortblock is about the only decent thing there, and they are usually old as hell too.

NA EJ25 should be a direct bolt in. even the ECU may just bolt into your car. get the same year as your car and pop it in. u should have close to direct bolt in, dont see why it wouldnt work. ive gto a DOHC EJ25 in my 93L and it only took about 2 days to put in.

its a good swap - easy too, EJ20 is the way to go if u are going turbo. JDM ej20. ther are no real USDM EJ20's

h
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Old 12-24-2003, 08:11 PM   #8
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I wish I could do an EJ20 swap but the price to do it is in such a huge range... $2000-7000... Umm, a little to sparatic for me.

Does anyone know how quick an EJ25 would be in an OBS? A little slower than a 2.5RS? I think I might go this way... not sure tho.

Thanks
-Ben
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Old 12-24-2003, 10:20 PM   #9
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Hey Ben, - Ben. I am also a Ben. Anyway, from experience the 25 swap takes about 20 hours, I helped h do his. It's pretty straightforward, and you dont have to deal with the massive wiring that turbos bring - which easily doubles installation time. If all fails, run some tiny collectors and make lots of low end!


Ben
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Old 12-25-2003, 02:28 AM   #10
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Wow... three Bens... Never happen before.

Anywho, what would you guys suggest... I'm going to need to lower the miles on my engine somehow and I'm contemplating either an EJ22T or STi block swap (if I get rich, I'll do the STi block ), or, swappin to RS Phase II heads OR do a EJ22T block/EJ25 head hybrid swap (save up and do all of it at a time when the EJ22 blows.

Merry Xmas, Hannukah, Kwanzaa, whatever
-Ben
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Old 12-25-2003, 05:08 AM   #11
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three Ben's!! excellent!

i think the best bet would be the ej22t/ej25 hybrid, i think that way you can continue to use your stock ecu with either piggybacks or stand alone controlling fuel and timing. i mean ideally you would do an STi short with ej25 heads but that requires more money. the ej22t/25 would make the most sense to me, for performance, money, and hassle. with that hybrid you get less cost, high performance potential with lots of room to grow, and A LOT less wiring hassle.

this is just me, i am not an expert(just specialist ) and i maybe missing something.

goodluck

dont forget to celebrate Festivus!

Ben
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Old 12-27-2003, 03:19 AM   #12
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I have figured out what I'm doing... I think... I don't know.

I will definately be swapping in some EJ20/22/25 engine, or at least the block... My plan for now, if money is a problem is:
Phase I: Whichever block I can find cheaper (EJ20, EJ22T or EJ25), new head gasket
Phase II: Turbo... Will start out with a cheap WRX turbo setup and will work my way up from there.
Phase III: Rebuild block to at least 'like new' status... If I have the money, I'll be rebuilding it with forged shinnanadoos
Phase IV: Head swap... EJ20, EJ22T, or EJ25

LOL I always find a way to give myself more decisions to make...

What do you guys think?
-Ben
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Old 09-06-2005, 06:53 PM   #13
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ta da! (I've brought it back from the dead!)
I've got a 99 OBS with 124k on it (not sure how much on the heads, but less than engine) and the engine's going to be shot by next summer. I'm going to need to replace it, and unles subaru releases an electric hybrid engine that fits the impreza, i'm probably going to stick to the 2.2l for the fuel consumption to power ratio. I've been hearing a lot about using different heads with the short blocks but don't really understand the technical aspects of it. Is there a way for me to use a ej22 with a different set of heads that will maintain or better my gas mileage and give me more power? AND/OR is it possible to run an ej22t shortblock without a turbo by increasing the compression ratio this way?
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Old 09-06-2005, 11:38 PM   #14
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the point of running different heads is usually to take advantage of either higher flow rates and/or different compression rates. for the n/a ej22e the only head that would make sense for a n/a application would be maybe an ej18 head which would increase the CR for higher horsepower. the ej18 has a smaller chamber volume than the stock heads so the overall compression is increased. the ej22t is a turbo engine so it has a much lower overall cr, withoout a turbo it would be very underpowered due to the low CR, camshaft profile (no overlap for one), etc... the fact is though the only way you are going to make more power from a non-turbo ej22e head swap would be the ej18 head, and the increased cr would mean that you would need to use premium gas to avoid detonation...so power isn't going to give you better gas millege
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Old 09-06-2005, 11:48 PM   #15
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one thing about turbos it that they can actually INCREASE fuel economy...i know that this is different from what we normally see on turbo cars but hear me out. the fact is that a turbo increases the power of the engine by using energy that would normally be turned to heat by your exhaust. instead of being wasted, this energy is now used to increase power therefore vastly increasing the engine's effecincy (i really cant spell). the reason why most turbo'd cars get worse millege is because the turbo is comonly there to increase power, the airflow reaches a point where a large amount of fuel is needed to overcome all the excess air and to keep the ole' fuel to air ratio good. if a turbo is ran conservatively, it can increase your fuel millege, as long as the amount of airflow dosent go high enough to need a large amount of extra fuel
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Old 09-07-2005, 01:27 AM   #16
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about the turbo efficiency: how would you be able to calculate such figures? in other words, how much boost would be needed (or limited) to get 30 mpg numbers? would i need a custom "econo"-turbo or just a boost controller?
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Old 09-07-2005, 02:05 AM   #17
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i'm not so sure that it could be done overly easy with an aftermarket turbo setup...maybe with a real small turbo and a piggyback ecu setup that you could use to setup the fuel map... you could probable have someone tune that setup for you
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Old 09-07-2005, 04:13 PM   #18
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...but wouldn't that end up costing me more per hp than if i just went with a larger engine and bit the bullet on gas prices basically...
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Old 09-07-2005, 05:00 PM   #19
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just swap to the motor u like and bite it on gas prices. you'll have alot of fun and be happy.

or buy a geo metro or crotch rockit to save gas.
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Old 09-11-2005, 04:03 AM   #20
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wow you guys brought a really really old thread back heh...

Crotch rocket.. Yes. Even the fastest, most powerful bike gets a few times the gas mileage of the best subaru.
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