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07-26-2007, 12:55 AM | #1 |
Scooby Newbie
Member#: 112589
Join Date: Apr 2006
Location: London, Ontario, Canada
Vehicle:2002 Subaru WRX UR Stage3 fmic vf34 |
JDM V7 heads mated to USDM 2.5 shortblock.
I was just thinking of a possible future setup for my 02 wrx. I tried searching but have not come up with any info. Is this do-able? Or will compression ratio get screwed up? I might have a lead on v7 heads including the ecu.
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07-26-2007, 08:03 AM | #2 |
Scooby Specialist
Member#: 92871
Join Date: Aug 2005
Chapter/Region:
MAIC
Location: Southeastern, PA
Vehicle:2005 CGM STI Ohlins/RCE/WL/GeNome |
it will raise the compression ratio... huff has v8 heads on his 2.5 block and i think hes up around 9.2:1 or something like that.
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07-26-2007, 09:49 AM | #3 | |
Scooby Specialist
Member#: 65267
Join Date: Jun 2004
Chapter/Region:
MAIC
Location: Arlington, VA
Vehicle:2002 WRX Silver |
Quote:
The valve covers and their associated gaskets are specific to the JDM heads. rallispec.com typically has the best price on the gaskets. The USDM fuel rails, even most aftermarket ones will come into contact with the AVCS on the JDM heads if you are using a USDM manifold and risers. Do yourself a favor and get a one piece JDM intake manifold riser combo so that you get yourself more clearance for the fuel rails. If you want a great flowing head with AVCS it is a good option but I would think the simplicity of the USDM WRX head with good cams and maybe a mild port job would be the route I would take if I were to do it all over again. |
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07-26-2007, 01:00 PM | #4 |
Scooby Newbie
Member#: 112589
Join Date: Apr 2006
Location: London, Ontario, Canada
Vehicle:2002 Subaru WRX UR Stage3 fmic vf34 |
Thanks Guys. I think I will pass up on taking this route, going by the information that you have given me. It sounds like too much of a hassle. I don't know if I like the idea of running such a high compression ratio. Maybe I will find some Usdm 2.5 sti heads with the avcs adapters from Gruppe S. My last choice would be to stick with the wrx heads.
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07-26-2007, 02:41 PM | #5 | |
Scooby Specialist
Member#: 65267
Join Date: Jun 2004
Chapter/Region:
MAIC
Location: Arlington, VA
Vehicle:2002 WRX Silver |
Quote:
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07-26-2007, 10:15 PM | #6 |
Scooby Newbie
Member#: 112589
Join Date: Apr 2006
Location: London, Ontario, Canada
Vehicle:2002 Subaru WRX UR Stage3 fmic vf34 |
ejh25.... How hard was it to wire the avcs from your v8 heads to the ecu on your 02 wrx? I assume you had the matching v8 ecu and tuned. Or did you have aftermarket engine management like Hydra?
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07-26-2007, 10:19 PM | #7 |
Scooby Specialist
Member#: 65267
Join Date: Jun 2004
Chapter/Region:
MAIC
Location: Arlington, VA
Vehicle:2002 WRX Silver |
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07-26-2007, 11:33 PM | #8 |
Scooby Newbie
Member#: 106583
Join Date: Feb 2006
Chapter/Region:
Tri-State
Location: Queens, NYC
Vehicle:1999 2.5RSTi Black |
what happens to the cr if u use cometic head gaskets with this setup?
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07-27-2007, 08:05 AM | #9 |
Scooby Specialist
Member#: 65267
Join Date: Jun 2004
Chapter/Region:
MAIC
Location: Arlington, VA
Vehicle:2002 WRX Silver |
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07-28-2007, 09:58 PM | #10 |
Sammo Hung
Moderator Member#: 10613
Join Date: Sep 2001
Chapter/Region:
South East
Location: N Fla / S Ga
Vehicle:2002 USDM WRX WRB |
you could always take off the avcs...
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07-29-2007, 09:14 AM | #11 |
Scooby Specialist
Member#: 65267
Join Date: Jun 2004
Chapter/Region:
MAIC
Location: Arlington, VA
Vehicle:2002 WRX Silver |
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