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Old 06-30-2008, 03:55 PM   #1
07ImprezaMB
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Question Questions on boosting a 07 2.5i.

Hey guys just a couple of questions on boosting my ej25 in my 07 2.5i. I know im going to need a wrx header and intake manifold. But the 2.5i's are only sohc. will the wrx headers work still. I hope so, my plans are wrx header, magnis intake manifold, and a 3 inch turbo back exhaust. But i got around to looking at it and remember that my car is only sohc compared to the wrx(dohc). So any advise or help with this matter will be greatly appreciated.
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Last edited by 07ImprezaMB; 06-30-2008 at 03:56 PM. Reason: typo
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Old 06-30-2008, 05:19 PM   #2
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Yes, it will work with a few changes.
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Old 06-30-2008, 08:48 PM   #3
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It will work but you'll need a turbo crossmember. It would almost be better to just buy a turbo kit from AVO or FAT or similar and not have to mess with it. Your build will probably cost the same and you'll get new parts. Remember you can't really go above 6 psi without motor work.
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Old 07-01-2008, 01:55 AM   #4
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An 07, huh?
Already looking to void your warranty eh?
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Old 07-01-2008, 12:11 PM   #5
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An 07, huh?
Already looking to void your warranty eh?
Does that really surprize you? Look at all the wrx's and sti's that do exactly the same thing.
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Old 07-01-2008, 01:13 PM   #6
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Does that really surprize you? Look at all the wrx's and sti's that do exactly the same thing.
Haha! Actually no, I'd do the same thing.
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Old 07-02-2008, 12:15 AM   #7
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Why go to a turbo kit on your N/A....you should have just spent the extra the extra $4k on a WRX TR....Focus on suspension upgrades so you can properly use the power you're already making!
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Old 07-02-2008, 01:03 AM   #8
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Why go to a turbo kit on your N/A....you should have just spent the extra the extra $4k on a WRX TR....Focus on suspension upgrades so you can properly use the power you're already making!
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Old 07-02-2008, 01:20 AM   #9
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Why go to a turbo kit on your N/A....you should have just spent the extra the extra $4k on a WRX TR....Focus on suspension upgrades so you can properly use the power you're already making!
honestly I have to say the same thing.... your car is worth BIG money being so BRAND NEW...well actually come to think of it...my 98 is probably worth almost as much .... but anyway, you still have a WARRANTY !.....(not like you'll ever need it )

what are your plans for the car ? daily driver with the occasional autox or rallyx ?? 1/4 mile ?? How "dependable" do you want your car to be ?? Adding possitive manifold preasure to ANY car that was NOT designed for boost , becomes a PROJECT right away...a project that will continue untill the day you sell your car...and don't let anyone tell you different. If this doesn't bother you, than boost away !.... for a basic 5lb settup, you can get a good 75hp more for under $2500 pretty reliably..... But anything more than that, and you should consider a full swap...or get ready to give your car to the wrench !

the ONLY reason I could ever see buying a 2.5rs over an wrx or sti, would be if I was going full stand alone , or swap anyway...

Last edited by IllNastyImpreza; 07-02-2008 at 01:26 AM.
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Old 07-02-2008, 01:23 AM   #10
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Quote:
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honestly I have to say the same thing.... your car is worth BIG money being so BRAND NEW...

the ONLY reason I could ever see buying a 2.5rs over an wrx or sti, would be if I was going full stand alone anyway...
Because many people, like the poster above you, will argue to no end if you do not say EXACTLY what they want to hear. If your experience/projects say otherwise, these people are expecting you to say exactly what they want to hear -- even those who have not even started their projects yet.
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Old 07-02-2008, 02:47 AM   #11
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i dont see any reason in the world why u would need anything but the stock RS manifold?

take the 1000+$ you would spend on the magnus manifold and spend it on a hydra, or on an ej257 or ej255 shortblock.....both of which will help your turbo'd rs not explode....

like people have said above...be prepared to spend money and time(a LOT of time) turbo'ing your RS.....I'm not saying go buy a wrx, but just dont underestimate what you're getting yourself into....

i turbo'd my bugeye even though everyone told me to just trade up for a wrx.....well 5 months after i started the project im now beating sti's at the track and still cost less than it would have to get myself into a stock 02 wrx.....but it wasn't easy.....i invested countless hours, blood, sweat and tears into the car.....but forme that's what its all about

take it for what it's worth.....
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Old 07-02-2008, 01:47 PM   #12
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I don't quite understand why everyone keeps bringing up em when the stock ecu is totally capable to handle the peramiters. Mind my spelling.
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Old 07-02-2008, 02:12 PM   #13
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I don't quite understand why everyone keeps bringing up em when the stock ecu is totally capable to handle the peramiters. Mind my spelling.
because any NON turbo ecu is simply NOT designed to run massive amount of fuel...and they freak out when they see boost.... "fooling" it into thinking its only recieving atmospheric manifold preasure, and "thinking" its only injecting normal duty cycles on the stock size injectors is just the ONLY way around the problem...

If it wheren't for emisions I would rip that thing out so fast I would probably take the floor board with it
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Old 07-02-2008, 04:41 PM   #14
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I don't quite understand why everyone keeps bringing up em when the stock ecu is totally capable to handle the peramiters. Mind my spelling.
the older RS ecus are in NO WAY capable of handling any sort of boost....i'd argue that even when piggybacked they are not ideal for higher boost applications...i know the new i ecus are flashable(open ecu etc.) but im not sure just how much can be done with flashing the ecu....can u alter the ecu to accept positive manifold pressure and to alter fuel and timing accordingly?
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Old 07-02-2008, 04:56 PM   #15
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^ I wonder the same...
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Old 07-02-2008, 06:23 PM   #16
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^ I wonder the same...
it would be nice...then i could get my hands on an 06 ECU/intake manifold/TB (06 on is DBW right?) and then rip out my hydra and use it for my upcoming project giant turbo GC(rs heads of course cause that's how i roll)....

hopefully someone will chime in!
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Old 07-02-2008, 10:46 PM   #17
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the older RS ecus are in NO WAY capable of handling any sort of boost....i'd argue that even when piggybacked they are not ideal for higher boost applications...i know the new i ecus are flashable(open ecu etc.) but im not sure just how much can be done with flashing the ecu....can u alter the ecu to accept positive manifold pressure and to alter fuel and timing accordingly?
In this case however we are talking about a reflashable newer ecu. Otherwise i would agree. I believe (at least on my eclipse) you can adjust the alter the ecu in such a way, while it is a different ecu, they are very similar.

Quote:
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because any NON turbo ecu is simply NOT designed to run massive amount of fuel...and they freak out when they see boost.... "fooling" it into thinking its only recieving atmospheric manifold preasure, and "thinking" its only injecting normal duty cycles on the stock size injectors is just the ONLY way around the problem...

If it wheren't for emisions I would rip that thing out so fast I would probably take the floor board with it
In this case we weren't talking about massive amounts of fuel. And flashing it isnt fooling it.
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Old 07-03-2008, 02:33 AM   #18
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In this case however we are talking about a reflashable newer ecu. Otherwise i would agree. I believe (at least on my eclipse) you can adjust the alter the ecu in such a way, while it is a different ecu, they are very similar.



In this case we weren't talking about massive amounts of fuel. And flashing it isnt fooling it.
we're not talking about simply scaling injectors here....we're talking about making an ECU thats not meant to see positive manifold pressures...and actualy be able to adjust for those pressure readings....

even with a piggy back (such as a emanage ultimate) u clamp the factory map, and get an aftermarket pressure sensor which plugs into the piggy back and that adjusts fuel and timing according to boost.....

the million dollar question is can the necessary logic to add fuel and pull timing in relation to manifold pressure be flashed onto the 2.5i ecu?

i think im gonna have to download the open ecu software and see exactly what can be done....but I'm very skeptical that you can flash the ECU to make it run well with a turbo
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Old 07-03-2008, 03:48 AM   #19
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I have an 06 2.5i so we pretty much have the same car, I wanted to do the same thing but really you're looking at spending a lot more money that you bargained for, the ecu can't handle the turbo, the stock fuel injectors would need to be changed (at least thats what I think) and our stock transmission wouldn't handle it, you would need to upgrade it, other than that with all that extra power you would definitely have to spend some money on the suspension and brakes
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Old 07-03-2008, 12:47 PM   #20
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In this case however we are talking about a reflashable newer ecu. Otherwise i would agree. I believe (at least on my eclipse) you can adjust the alter the ecu in such a way, while it is a different ecu, they are very similar.



In this case we weren't talking about massive amounts of fuel. And flashing it isnt fooling it.
Yeah but the EMU IS fooling it. For me thats really my ONLY option (in order to pass emissions)

IIRC Ispeed is the only company that reflashes them? and they only do 99-04...

Being a 98, I'm **** out of luck... Buy what about the OP having an 07 ??
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Old 07-03-2008, 01:09 PM   #21
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Everyone, thanks for the input and help. I found a avo full turbo kit for my car i am going with. Already comes with the stuff to tune it and it only runs max of 6psi. So running only 6 on my stock ej25 shouldnt hurt it and it should still be reliable. And im getting it put on and professionaly tuned at AR Fabrication in winchester va. They specialize in building subarus and im fully confident that nothing will happen to it and it will be fast! I already have 2.5 inch cat back exhaust, 17 inch gold wheels, skunk 2 lowering springs, and when i get my turbo kit put on im getting lightweight harmonic pulley dampeners and a light weight flywheel. So it should be a fun little car
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Old 07-03-2008, 01:47 PM   #22
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Everyone, thanks for the input and help. I found a avo full turbo kit for my car i am going with. Already comes with the stuff to tune it and it only runs max of 6psi. So running only 6 on my stock ej25 shouldnt hurt it and it should still be reliable. And im getting it put on and professionaly tuned at AR Fabrication in winchester va. They specialize in building subarus and im fully confident that nothing will happen to it and it will be fast! I already have 2.5 inch cat back exhaust, 17 inch gold wheels, skunk 2 lowering springs, and when i get my turbo kit put on im getting lightweight harmonic pulley dampeners and a light weight flywheel. So it should be a fun little car

sounds good bro!

take it easy on the tranny.....the 10:1 CR + boost makes TONS of torque....the tranny can take it as long as you're gentle on it....

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Old 07-03-2008, 04:57 PM   #23
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Yeah i will def be easy on it, have to for like 5000 miles to break it in...... But subaru makes a sti clutch for a 5 speed. I will eventually upgrade to that.
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Old 07-03-2008, 07:38 PM   #24
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Yeah i will def be easy on it, have to for like 5000 miles to break it in...... But subaru makes a sti clutch for a 5 speed. I will eventually upgrade to that.
as soon as you upgrade your clutch...kiss your gears goodbye
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Old 07-03-2008, 08:52 PM   #25
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lol why do you say that??
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