Frank motor build

nickkurz · 06-28-2012, 02:53 PM

I am new to the serious upgrade game and want to put a 2.5 short block into my 02 wrx and have it to about 400-450 whp. Not really sure where to start whether it's best to get a oem 2.5 or an already built 2.5, could also get a blown or damaged 2.5 an rebuild that. My 02 2.0 has 110k on it so I need to do something like to keep the 02 drivetrain, axels, hubs and so forth just want to do engine, turbo, and exhaust.

amroof · 06-30-2012, 06:55 PM

realistically you dont have a trans that will support more than factory! just saying so you dont get your hopes up and all about having that much powa.

yes many people have put that much power out of their cars but they never last or if they do they dont get driven the way they should be.

so keep that in mind when building you have a glass 5 speed.

and if you are gonna do a hybrid get the heads deshrowed. so you can run the 2.0 heads the right way.

sorry for being negative nancy just been there and hated spending that much money.

FatalElement · 07-02-2012, 06:43 AM

I am running a stock STI 2.5 liter short block with my 04 WRX 2.0 liter heads with 1.5mm Cosworth head gaskets and have been for about five years now. I have gone though two gear boxes now and I'm only making 310whp and 319 lb ft of torque on a TD06 18G. I finally went with PPG straight cut gears with the STI RA 5th. The 5th gear was left over from the first rebuild which was the STI RA 5 speed.....it lasted about six months. I have had no problems with the PPG gear box so far, I am sure if I upgraded again power wise the box would not last. So if you are going for 400whp budget some money for the STI 6 speed it will save you money in the long run. Side note I would like to know what was meant by deshrouding the heads?

amroof · 07-02-2012, 05:28 PM

de shrouding the heads cleans up any sharp edges on the cylinder heads! these edges cause hot spots and can cause detoniation aka engine destroyer.

you get these edges as you are putting a head from n engine with a factory bore of 92mm and putting them on a factory bore of 99.5m so lots of edges in the cylinder are exposed.

lockmedic · 07-13-2012, 01:16 PM

I've got an EJ20T from a 2005 Saabaru (9-2x) and a burned long block from a 2004 Forester 2.5XT that I've been thinking of doing this to. Probably leave it as a slushbox for now tho.

Wish there was a way to retain the AVCS without having to source an STi or Forester ECU/harness. . . or go open source.

06-28-2012, 02:53 PM	#1
nickkurz Scooby Newbie Member#: 308732 Join Date: Feb 2012 Chapter/Region: South East Location: savannah, ga Vehicle: 2011 Subaru Wrb	Frank motor build I am new to the serious upgrade game and want to put a 2.5 short block into my 02 wrx and have it to about 400-450 whp. Not really sure where to start whether it's best to get a oem 2.5 or an already built 2.5, could also get a blown or damaged 2.5 an rebuild that. My 02 2.0 has 110k on it so I need to do something like to keep the 02 drivetrain, axels, hubs and so forth just want to do engine, turbo, and exhaust.

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06-30-2012, 06:55 PM	#2
amroof Scooby Specialist Member#: 211224 Join Date: May 2009 Chapter/Region: RMIC Location: Aurora, CO Vehicle: 2005 Mystical UniCorn FXTi	realistically you dont have a trans that will support more than factory! just saying so you dont get your hopes up and all about having that much powa. yes many people have put that much power out of their cars but they never last or if they do they dont get driven the way they should be. so keep that in mind when building you have a glass 5 speed. and if you are gonna do a hybrid get the heads deshrowed. so you can run the 2.0 heads the right way. sorry for being negative nancy just been there and hated spending that much money.

07-02-2012, 06:43 AM	#3
FatalElement Scooby Newbie Member#: 188785 Join Date: Sep 2008	I am running a stock STI 2.5 liter short block with my 04 WRX 2.0 liter heads with 1.5mm Cosworth head gaskets and have been for about five years now. I have gone though two gear boxes now and I'm only making 310whp and 319 lb ft of torque on a TD06 18G. I finally went with PPG straight cut gears with the STI RA 5th. The 5th gear was left over from the first rebuild which was the STI RA 5 speed.....it lasted about six months. I have had no problems with the PPG gear box so far, I am sure if I upgraded again power wise the box would not last. So if you are going for 400whp budget some money for the STI 6 speed it will save you money in the long run. Side note I would like to know what was meant by deshrouding the heads?

07-02-2012, 05:28 PM	#4
amroof Scooby Specialist Member#: 211224 Join Date: May 2009 Chapter/Region: RMIC Location: Aurora, CO Vehicle: 2005 Mystical UniCorn FXTi	de shrouding the heads cleans up any sharp edges on the cylinder heads! these edges cause hot spots and can cause detoniation aka engine destroyer. you get these edges as you are putting a head from n engine with a factory bore of 92mm and putting them on a factory bore of 99.5m so lots of edges in the cylinder are exposed.

07-13-2012, 01:16 PM	#5
lockmedic NASIOC Supporter Member#: 314893 Join Date: Mar 2012 Location: Kingston, TN	I've got an EJ20T from a 2005 Saabaru (9-2x) and a burned long block from a 2004 Forester 2.5XT that I've been thinking of doing this to. Probably leave it as a slushbox for now tho. Wish there was a way to retain the AVCS without having to source an STi or Forester ECU/harness. . . or go open source.