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Old 10-02-2008, 02:45 AM   #1
Scooby Newbie
Member#: 152450
Join Date: Jun 2007
Chapter/Region: VIC
2001 Impreza 2.5RS

Default STI block/Turbo in the future Question

Bad day for me as my engine (EJ251) seems to have some issue (huge sound from internal, barely run). My friend told me the engine seems to be gone. I'm thinkin of getting STI block first and planning to turbo it in the future (need to save $$ for turbo, proper EMU, etc). Can i run 2.5RS stock head/ecu on STI block w/o turbo? I know the CR will be much lower w/ the STI block. But i'm not sure if the car will still run w/ only STI block and other stock RS parts (head,ecu).

PS - i can't swap STI beacuse it will cost me way too much here in Canada (12K for STI).

sorry if i sound stupid im pt new to subaru. My car is 2001 impreza 2.5RS (EJ251)
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Last edited by shinji666; 10-02-2008 at 05:32 AM.
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Old 10-02-2008, 11:52 AM   #2
Scooby Specialist
Member#: 32503
Join Date: Feb 2003
Chapter/Region: TXIC
Location: Johnson City, TX
2011 Tribeca
1995 Legacy Wagon


The car will run, but it'll be slower than stock even, especially in the higher rpms!
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Old 10-02-2008, 06:19 PM   #3
Scooby Specialist
Member#: 189606
Join Date: Sep 2008
Chapter/Region: SCIC
Location: Oceanside, CA
E46 M3
Ti Silver


Check out crawford performance's blocks- they have good stuff overall.
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Old 10-06-2008, 02:22 PM   #4
Scooby Specialist
Member#: 40413
Join Date: Jul 2003
2001 BRP RS-T EJ257
Link'd - 252WHP 274WTQ


You can get used EJ251 longblock for pretty cheap.
Dont go EJ257 unless you are going turbo. Timing will be way off from a 10:1 to an 8.4:1.
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Old 10-07-2008, 03:33 AM   #5
Scooby Specialist
Member#: 187834
Join Date: Aug 2008
06 2.5i impreza


what about an 06 2.5i with SOHC heads and an EJ257 block running stock ECU plus say AVO turbo kit...this is an easy solution seeing as the SOHC heads flow better than that of the DOHC heads..is it possible..I won't be running just with out turbo its so I can have a beefy block to hold boost really..plus imjectors aswell too.
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Old 10-07-2008, 10:15 AM   #6
Scooby Guru
Member#: 36333
Join Date: May 2003
Chapter/Region: NESIC
Location: East Kingston NH
98 RS
GT30R, closed deck madnes


I am currently running a fully sleeved, balanced and blueprinted cobb block on my (sort of) stock heads....no turbo. about an 8.0-1 CR currently....

does it run well? Yes...

is it slow as ****? yes

an sti block swap will be a great way to avoid wiring, and be a MUCH easier install. BUT I only went this route due to having to pass emissions... if I where going to use a Full stand alone ECU, I would DEFINATLY have just done a full STI (us or JDM) swap.
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