'04 EJ20 to '04 EJ257 long block..

99imprezd · 10-04-2012, 04:51 PM

Swappin my Ej20(stock except for ACL rod & main bearings) for a built '04 EJ257 long block.. fresh bore/hone, manley rods, wiseco pistons 8.9:1 CR / 100mm, stock '04 EJ257 heads & cam gears. Not running AVCS.. utilizing ej20 manifold harness/ecu.. Currently im running a Cobb catless VF39 tune, with STi pink injectors, and VF39 turbo. Supporting mods, TGV deleted, oem 2004 STi cat back, 3" catless invidia DP, perrin catless UP, Perrin turbo inlet, AEM short Ram, step colder NGK plugs etc..

Question.. Can I get a tune from COBB that will compensate for the larger displacement still using my ej20 ecu or do I have to open source/etune or smthn.

Also, what clutch setups are people runnin on EJ257 swaps still using the 5spd wrx trans..? Was gonna replace the whole thing with an exedy kit & flywheel.. THis is my daily driver so I dont need anything crazy but a little extra holding capabilty is always nice.

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speedyHAM · 10-07-2012, 11:11 AM

You will need a custom tune to deal with the extra displacement.

The EJ257 can use the same flywheel and clutch as the EJ205's use when using a 5 speed.

99imprezd · 10-07-2012, 11:38 PM

I was thinkin about loading a cobb 04 STi stage 1 tune for break in on low boost.. wouldnt an sti tune make correct adjustments for 2.5 litres? Not sure if the ecu will let me load an EJ25 map on my EJ20 ecu but worth a shot?

99imprezd · 10-08-2012, 03:00 PM

hmm.. nothin? does anyone have or know of a standard tune for EJ257 swapped wrx's?

10-04-2012, 04:51 PM	#1
99imprezd Scooby Specialist Member#: 198964 Join Date: Jan 2009 Chapter/Region: Tri-State Location: south NJ Vehicle: 2004 WRX wgn, built! WRB	'04 EJ20 to '04 EJ257 long block.. Swappin my Ej20(stock except for ACL rod & main bearings) for a built '04 EJ257 long block.. fresh bore/hone, manley rods, wiseco pistons 8.9:1 CR / 100mm, stock '04 EJ257 heads & cam gears. Not running AVCS.. utilizing ej20 manifold harness/ecu.. Currently im running a Cobb catless VF39 tune, with STi pink injectors, and VF39 turbo. Supporting mods, TGV deleted, oem 2004 STi cat back, 3" catless invidia DP, perrin catless UP, Perrin turbo inlet, AEM short Ram, step colder NGK plugs etc.. Question.. Can I get a tune from COBB that will compensate for the larger displacement still using my ej20 ecu or do I have to open source/etune or smthn. Also, what clutch setups are people runnin on EJ257 swaps still using the 5spd wrx trans..? Was gonna replace the whole thing with an exedy kit & flywheel.. THis is my daily driver so I dont need anything crazy but a little extra holding capabilty is always nice. * Registered users of the site do not see these ads.

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10-07-2012, 11:11 AM	#2
speedyHAM Scooby Specialist Member#: 48377 Join Date: Nov 2003 Chapter/Region: MWSOC Location: "They eat fish soaked in lye" Vehicle: 1996 Gutted, built XP class Impreza L	You will need a custom tune to deal with the extra displacement. The EJ257 can use the same flywheel and clutch as the EJ205's use when using a 5 speed.

10-07-2012, 11:38 PM	#3
99imprezd Scooby Specialist Member#: 198964 Join Date: Jan 2009 Chapter/Region: Tri-State Location: south NJ Vehicle: 2004 WRX wgn, built! WRB	I was thinkin about loading a cobb 04 STi stage 1 tune for break in on low boost.. wouldnt an sti tune make correct adjustments for 2.5 litres? Not sure if the ecu will let me load an EJ25 map on my EJ20 ecu but worth a shot?

10-08-2012, 03:00 PM	#4
99imprezd Scooby Specialist Member#: 198964 Join Date: Jan 2009 Chapter/Region: Tri-State Location: south NJ Vehicle: 2004 WRX wgn, built! WRB	hmm.. nothin? does anyone have or know of a standard tune for EJ257 swapped wrx's?