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Old 09-03-2008, 09:04 AM   #1
Boosted WRX STi
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Subaru Stars 2.5i heads with EJ257 bottom end

Will an STi bottom end bolt up to my heads and can I use all my accessories... ac, alternator, water-pump, etc.. and if i were to do this, and slapped on a turbo, would i need new EM, or is my stock ECU tune-able?

For the record, I've heard and read my heads will bolt up to an EJ257, I don't know about all the accessories though, and I have read that the 06+ ECU on a 2.5i is tune-able.. just trying to get a more clarified answer.

Thanks.
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Old 09-03-2008, 09:38 AM   #2
mxpunk
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you will need to reflash it + use some sort of piggybacking for your best results IMO.

but yeah, your ecu is flashable so you should have good results, if its done right
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Old 09-03-2008, 03:08 PM   #3
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Im assuming your car is turboed or it will be soon.. otherwise its gonna be snail slow.
I dont know how the coolant pipe is on 06, but if its the same as the 99-01 2.5RSs, then you are gonna have to modify it for it to clear the extra breather the STI block has.

read the FAQ... and it'll explain it there.
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Old 09-03-2008, 05:02 PM   #4
Nuke209
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any chance of you selling it and getting a wrx or sti?
just seems like a headache to get it that way

but if you must, why not do a full drivetrain swap?
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Old 09-03-2008, 06:50 PM   #5
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Quote:
Originally Posted by maxiav View Post
Im assuming your car is turboed or it will be soon.. otherwise its gonna be snail slow.
I dont know how the coolant pipe is on 06, but if its the same as the 99-01 2.5RSs, then you are gonna have to modify it for it to clear the extra breather the STI block has.

read the FAQ... and it'll explain it there.
I did a quick look through and wasn't really clear on whether or not I would need to modify the coolant line, I'll definitely look into this.

Quote:
Originally Posted by Nuke209 View Post
any chance of you selling it and getting a wrx or sti?
just seems like a headache to get it that way

but if you must, why not do a full drivetrain swap?
I leased the car two years ago, and have two left, it was a good deal, but my car is 'snail slow' as maxiav put it. I am more just toying with the idea of swapping the bottom end to drop my comp ratio and run moderate boost. In the end, I'll probably wait until my lease is up and get a 2010 STi. I love my car, just wish I could make it quicker.
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Old 09-03-2008, 06:58 PM   #6
shutupnshift04
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its leased right? throw some nitrous in that pig and beat it till it blows.....thats what my girl does atleast ahahha
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Old 09-04-2008, 08:32 AM   #7
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Quote:
Originally Posted by Nuke209 View Post
any chance of you selling it and getting a wrx or sti?
just seems like a headache to get it that way

but if you must, why not do a full drivetrain swap?
Always with the selling it
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Old 09-04-2008, 11:54 AM   #8
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You're going to swap the shortblock on a leased car? Are they going to ding you for that when you turn the car back in? Maybe it's time to put the car up leasetrader?
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Old 09-04-2008, 12:10 PM   #9
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You're going to swap the shortblock on a leased car? Are they going to ding you for that when you turn the car back in? Maybe it's time to put the car up leasetrader?
I would buy the car out come the lease end. This question was more just out of curiosity, and to see what my options would be if I decided to do it.
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Old 09-04-2008, 02:26 PM   #10
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Quote:
Originally Posted by Boosted WRX STi View Post
I would buy the car out come the lease end. This question was more just out of curiosity, and to see what my options would be if I decided to do it.
It isn't just a matter of slapping a turbo on and throwing a shortblock in, its a huge amount of work to turbo a NA motor, you need a turbo waterpump, turbo headers, tmic, boost controller, custom oil feed and drain lines, and many other things. Don't forget the dozens of trips to the hardware store and dozens more clearance issues to fix. Having just completed the exact same thing you speak of but on a 99rs, let me tell you that unless you buy a premade kit or have extensive wrenching experience DO NOT DO IT. It worked out for me because I have years and years of wrenching experience and a full shop at my hands. In your lease position on such a new car, your best bet is selling it for a wrx,swapping it, or premade kit.
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Old 09-04-2008, 04:18 PM   #11
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I have a 06 2.5i with 9,000 miles on it..I was thinking of turbo charging it also but I wanted to find out if anyone had a site or new a company in the US that sold the WRX engine and ECU and harness as a package...for the right price I'd just do the swap and put the 2.5i on a pallet covered down in my garage for when ever I need to to throw her back in or not. Any sites would be appreciated thanks...the question remains if you throw on the SOHC HEAD will it flow with pressure. Also you'd still need to get a 3mm gasket to lower the compression cause it would still be up there maybe 9.2?
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Old 09-04-2008, 04:34 PM   #12
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Quote:
Originally Posted by rdodger View Post
It isn't just a matter of slapping a turbo on and throwing a shortblock in, its a huge amount of work to turbo a NA motor, you need a turbo waterpump, turbo headers, tmic, boost controller, custom oil feed and drain lines, and many other things. Don't forget the dozens of trips to the hardware store and dozens more clearance issues to fix. Having just completed the exact same thing you speak of but on a 99rs, let me tell you that unless you buy a premade kit or have extensive wrenching experience DO NOT DO IT. It worked out for me because I have years and years of wrenching experience and a full shop at my hands. In your lease position on such a new car, your best bet is selling it for a wrx,swapping it, or premade kit.
Thank you, but I know this already, and do have quite a bit of wrenching experience. Unfortunately I do not have a shop to work in at my discretion, other then my buddies Chevy dealer that I would have to do after hours, and as I'm in school right now, its too far away. I was wondering whether or not swapping the bottom end will be an easier solution then a full motor swap.
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Old 09-04-2008, 04:36 PM   #13
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Quote:
Originally Posted by VIsubi View Post
I have a 06 2.5i with 9,000 miles on it..I was thinking of turbo charging it also but I wanted to find out if anyone had a site or new a company in the US that sold the WRX engine and ECU and harness as a package...for the right price I'd just do the swap and put the 2.5i on a pallet covered down in my garage for when ever I need to to throw her back in or not. Any sites would be appreciated thanks...the question remains if you throw on the SOHC HEAD will it flow with pressure. Also you'd still need to get a 3mm gasket to lower the compression cause it would still be up there maybe 9.2?
Talk to Frank at Millennium Auto, they have a bunch of STi kits and WRX kits for sale. They run from $3800 for just a WRX motor package, up to $12,000 for a full STi drivetrain swap. Hope that helps you.
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Old 09-04-2008, 05:46 PM   #14
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The price of the car, turbo, engine and finance charges (the residual cannot be great on a Subaru not to mention who knows what money factor the dealership used)...this does not make financial sense. I would just turn it in at the end of the lease and source a used STI or whatever you want and start fresh.
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Old 09-05-2008, 09:32 AM   #15
VIsubi
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Thanks Boosted I'm gona do a search on google for this company since no web address. I also think its best just to buy the whole engine and ECU..friend of mine bought an SR20 silvia black top motor with tranny and ecu for 5000..not a bad price seeing as the wrx motor is just a run harness and bolt up to tranny. From what I've heard the gas tank bowl is different and theres three fuel lines compared to the two on the 2.5i..friend of mine bought a wrx from an insurance company after they rolled it for 600 bucks..but wouldn't a upgraded fuel pump just work..from what he said he had to swap in the gas tank aswell..I don't really see the need to do all that. if anyones got feedback on this it would be greatly appreciated. Or I'll just ask the guys at millenum auto. Thanks Boosted
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