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Old 12-07-2014, 10:40 AM   #1
Subby2.5i
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Member#: 338792
Join Date: Nov 2012
Default Building the EJ253

First things first, please keep the negative comments to yourself. I'm seeking professional input on building my EJ253 on my 2007 Impreza 2.5i
A little over a year ago I built a turbo kit for 2007 N/A Impreza. It consisted of a rotated td-05 18G turbocharger, Walboro 255 fuel pump, larger injectors, boomba fuel rails, and the obvious others (exhaust, tuning, along with other parts) I'm currently running 6 lbs of boost safely with a open wastegate. When I got the car tuned at EFI Logics I was talking to Mikey about actually building the motor. Yes Ive considered swaps, and hybrids. Do not lecture me on how I should have bought a WRX or how I should sell my car to buy a WRX because "it will be cheaper in the long run"
As from what I've been told I can run STI rods along with STI pistons. Obviously I would imagine I would have to get machining done. I would also have to run a larger oil pump.
Ideally I want to run more boost. I'm looking to pull the motor within the next couple weeks to start building, I just want to get some input and information before I start digging in.
Basically I want to run STI rods and pistons to support more boost safely.
As far as hybrid building, what type of options do I have as far as heads go? Is it worth it to swap a head on?
I would also like to send my cam out to get regrinded by delta, along with larger injectors, and possibly running an external wastegate.
Questions I have now, will STI rods be a direct drop into the EJ253?
Is there anything else I should do to accompany the rods/pistons. Opinions on brand piston to run? Professional input would be greatly appreciated!
Of course I'll throw a couple pics in of the car


After fogs, recessing the front mount back a few inches, and new wheels

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Old 12-07-2014, 05:38 PM   #2
vicious_fishes
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Member#: 158864
Join Date: Sep 2007
Location: Aussieland
Vehicle:
2003 GD w/EZ30D swap

Default

NA rods are about 1.4mm or something longer than turbocharged rods. if you want turbo internals, you need pistons AND rods.

however, don't pay too much attention to your PSI so much as what power you're making. the raptor kits run 9lbs all day long for example.

i found when i boosted mine that the last piston in the series (#3 iirc) fried the rings first as it was the leanest/too lean. tune it to 11.5:1 air fuel, wind the wick up with a proper wastegate/boost controller and have a blast. i wouldn't personally bother building it until you kill it, which if done right will be a long way off.

if you do want to build it, by the time you messed around building everything etc etc it'd be easier (and cheaper) to just buy an ej255/257 short block and slap your heads on it. hell you could even score some FI cams and drop those straight in as well. then all you'd need would be some head studs and you're ready to rock & roll.

<- supercharged his impreza RS SOHC.
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Old 12-07-2014, 07:47 PM   #3
Subby2.5i
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Member#: 338792
Join Date: Nov 2012
Default

Quote:
Originally Posted by vicious_fishes View Post
NA rods are about 1.4mm or something longer than turbocharged rods. if you want turbo internals, you need pistons AND rods.

however, don't pay too much attention to your PSI so much as what power you're making. the raptor kits run 9lbs all day long for example.

i found when i boosted mine that the last piston in the series (#3 iirc) fried the rings first as it was the leanest/too lean. tune it to 11.5:1 air fuel, wind the wick up with a proper wastegate/boost controller and have a blast. i wouldn't personally bother building it until you kill it, which if done right will be a long way off.

if you do want to build it, by the time you messed around building everything etc etc it'd be easier (and cheaper) to just buy an ej255/257 short block and slap your heads on it. hell you could even score some FI cams and drop those straight in as well. then all you'd need would be some head studs and you're ready to rock & roll.

<- supercharged his impreza RS SOHC.
Interesting... Thanks for the input! On another note, say I did buy a short block, what would I do, just swap everything over? Would I have to gather anything else or just grab the short block and swap everything?
What have you done to support your supercharger? The car has been running awesome, I had it dyno tuned by EFI logics. If I follow through with building I may return there for Mikey to finish the tune or I may look into RT tuning. I've heard awesome reviews about them
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