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Old 03-10-2020, 11:44 PM   #1
aaronnichols
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Default What Internals should I get?

Interested in Beefing up internals so I can add a turbo to my stock 2.5l ej25 block. Looking to get 300 hp. I know I must upgrade pistons and but not sure about the crank shaft and, valves and rockerarms and probably all the other thibgs Im missing. I am completely new to all of this and any insight would be appreciated.
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Old 03-11-2020, 10:38 AM   #2
Turn in Concepts
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Is your car currently running and has no issues? If that is the case the sell it and buy a car that started turbo. It will save you a bazillion headaches and problems, AND will save you money in the long run.

Yeah, I sound like an ass saying this, but really it would work out better for you.
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Old 03-11-2020, 10:45 AM   #3
subydude
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Quote:
Originally Posted by Turn in Concepts View Post
Is your car currently running and has no issues? If that is the case the sell it and buy a car that started turbo. It will save you a bazillion headaches and problems, AND will save you money in the long run.

Yeah, I sound like an ass saying this, but really it would work out better for you.
Agreed.
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Old 03-11-2020, 11:00 AM   #4
Jedi03
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+1 get already turbo'd otherwise you will spend same amount on just getting yours to stock power levels of the turbo cars and lots of extra unnecesary man hours..
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Old 03-11-2020, 07:04 PM   #5
aaronnichols
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Talking

I should have said this earlier but I have a stock ej253 in my 05 impreza RS. Im having fun doing the build myself and am passionate about building the perfect sleeper.

It all started when my Head Gasket blew and my engine started over heating. I also had a Missfire code going on and oil on one of the spark plug boots. So I decided to tackle the project myself.

I ordered one of the felpro gasket repair kit. Pulled the motor out and removed the heads. In the process Ive noticed ware on the bottom side of two cylinder walls. Also noticed two valves were slightly opened but I wasnt sure if they were supposed to be that way due to the cam position so i left it alone.

I cleaned the head surface slapped on the head gaskets and called it a day. Then I installed the motor, refilled the fluids, by accident i overfilled the oil by about a quart and ran it. I did drain the excess oil while feeling like a moron. I seen there was no leaks and ran the car again this time for 1 hour to see if it would overheat.

The car did not over heat. The car did have some white smoke coming out of the exhaust. Maybe that is because the oil blew by the piston rings or from the valves being open idk. Hell maybe its because i need to replace the crack seals who knows.

I do have a short block on order from IAG and looking forwrd to blowing that one up too!

"Ps the idiot before me put gasket sealant on valve cover for the spark plug access hole which may be the cause of the oil on the boot. Not knowing how critical that was I failed to remove the old grey gasket seal material which probable not helping my situation lol."

Last edited by aaronnichols; 03-11-2020 at 07:16 PM.
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Old 03-11-2020, 09:32 PM   #6
sebastian323
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Quote:
Originally Posted by Turn in Concepts View Post
Is your car currently running and has no issues? If that is the case the sell it and buy a car that started turbo. It will save you a bazillion headaches and problems, AND will save you money in the long run.

Yeah, I sound like an ass saying this, but really it would work out better for you.
just out of curiosity

what about taking a NA impreza and dropping a turbo engine and ECU in ? How would that work out ?

Is the drivetrain from the transmission onward different between an NA impreza and WRX ?

I imagine you could take a wrecked WRX and swap over the drivetrain to an N/A impreza ?
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Old 03-11-2020, 10:17 PM   #7
aaronnichols
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Moderators can you please delete this message.

Last edited by aaronnichols; 03-11-2020 at 10:22 PM.
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Old 03-11-2020, 10:17 PM   #8
aaronnichols
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Quote:
Originally Posted by sebastian323 View Post
just out of curiosity

what about taking a NA impreza and dropping a turbo engine and ECU in ? How would that work out ?

Is the drivetrain from the transmission onward different between an NA impreza and WRX ?

I imagine you could take a wrecked WRX and swap over the drivetrain to an N/A impreza ?


Today 09:17 PM
aaronnichols Yes thats probably what Im going to do. Ill buy a wrecked STI Tranny and differemtial and ECU most likely
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Old 03-12-2020, 09:13 AM   #9
GalaxyWide
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I believe the front crossmember is different, you'll need the car side harness too since the connection points are different, and you need to watch out for cable throttle/drive-by-wire. It's really not as easy as sticking a turbo motor in, there's a reason no one does it.
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Old 03-12-2020, 11:16 AM   #10
subaru_gc8
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Quote:
Originally Posted by GalaxyWide View Post
I believe the front crossmember is different, you'll need the car side harness too since the connection points are different, and you need to watch out for cable throttle/drive-by-wire. It's really not as easy as sticking a turbo motor in, there's a reason no one does it.
not to mention the plug to the ecu will probably be different as well, it will probably be easier to wire in an after market ecu. I would caution you though. if you are asking what you need to do to build a block on the internet, you might be going over your head. talk a vendor and ask them.

Last edited by subaru_gc8; 03-12-2020 at 11:25 AM.
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Old 03-12-2020, 04:52 PM   #11
pcampbell
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You do not need any motor work to make 300 crank hp on a stock 2005 ej253. You do not need a different ECU to add a turbo to a 2005 car. Re-mapped stock ECU will handle it fine. The stock EJ253 motor is fine up to something over 300 whp WITH good fuel and cooling, again, water meth or E85.

If you want to keep your 2.5 car, keep your EJ253 heads, rebuilt with multi angle valve job, Delta cams, Supertech springs and retainers, possibly Supertech inconel exhaust valves (cost about $1500 for all of that including labor)) and put a ej257 bottom end on it, forged or not ,depending on goals.

You'll need a fuel pump, fuel injectors.
Full exhaust
Modified or WRX crossmember
Intercooler
Turbo
turbo piping
BPV
Gauges
Whatever other supporting mods + a good tune

Last edited by pcampbell; 03-12-2020 at 05:37 PM.
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Old 03-12-2020, 05:03 PM   #12
pcampbell
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Quote:
Originally Posted by sebastian323 View Post
just out of curiosity

what about taking a NA impreza and dropping a turbo engine and ECU in ? How would that work out ?

Is the drivetrain from the transmission onward different between an NA impreza and WRX ?

I imagine you could take a wrecked WRX and swap over the drivetrain to an N/A impreza ?

It is essentially the same between NA 2.5i car and pre 2015 non STI WRX.
5MT and R160 diff.
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Old 03-23-2020, 01:24 PM   #13
Stoni23
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Hey guys recently bought a jdm ej20, have similar questions as the op and going to start a thread with more details but newish here in nasioc and need 1 more comment to start one so hi lol. Also have a post in newbies faqs searching for help identifying exactly which engine I have if possible, can anyone help?
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Old 03-26-2020, 01:18 PM   #14
spoolinsti05
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Stock is fine. Just tune for no knock. None at all...
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Old 03-30-2020, 08:09 PM   #15
IndagoEaton
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Default

how many miles are on the vehicle
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