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Old 10-13-2008, 11:03 PM   #1
Scooby Newbie
Member#: 85808
Join Date: Apr 2005
Chapter/Region: NESIC
Location: East Haddam, CT
2004 WRX
WR Blue

Default 2.5L/2.0L hybrid - Which flywheel/clutch do I need?

I'm in the process of having a 2.5L block from a 2005 STi build up with my 2.0L heads after throwing a rod bearing in my 2004 WRX. While the motor is out and since I'm (hopefully) going to be making some good power when I'm done, I want to change the flywheel and clutch to handle it. Question is, what do I need? Does the flywheel have to match up to the STi block, do I need to get an STi clutch to match the flywheel? How do I make this work, the 2.5 block with stock WRX tranny? I'm learning as I go along here
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Old 10-13-2008, 11:10 PM   #2
Scooby Newbie
Member#: 64298
Join Date: Jun 2004
Chapter/Region: NESIC
Location: Unionville, CT
08 STI
02 WRX


Your clutch and flywheel depend on your transmission. Using your existing parts would be just fine.
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Old 10-15-2008, 11:12 PM   #3
Scooby Newbie
Member#: 44702
Join Date: Oct 2003
Chapter/Region: RMIC
Location: Denver, CO
2002 Impreza WRX


You can use the clutch you already have.

Depending on how many miles were on your clutch though, you might consider replacing the clutch disc itself.
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Old 10-16-2008, 01:01 AM   #4
Scooby Specialist
Member#: 74907
Join Date: Nov 2004
Chapter/Region: NWIC
Location: salem, OR
98 cam'd EJ251
Wrx Tranny,slowr than ish


Stock disc, and flywheel. But you might want to consider an upgraded pressure plate.

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