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Old 06-21-2008, 02:38 AM   #1
RankFrank
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Member#: 60682
Join Date: Apr 2004
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
2006 WRX
WRB

Default question for a mild build

I'm planning a 6mt transmission swap as a drivability upgrade and a prereq for power upgrades, and was thinking that since the engine would be out of the car (partway, anyway), that'd a good time to do the block if I have to.

I have a regular 06 wrx, and my goals are modest - 300whp and good daily driver/fuel economy when not flogging the motor. I've been lusting after the crawford shortblocks, but that may not (probably won't) be necessary.

My question is this - what's a good base block for a target 300 (or 325)whp subaru? I'd like to get ok mileage (22-24 hwy would be fine), and I want to be able to keep a TMIC and eventually get the redline to 7k. Target application is track days and autocross (which is probably just fine as is). I don't really expect the top speed to top 150, but having more headroom in lower gears is a good thing.
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Old 06-22-2008, 04:06 PM   #2
sts2689
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Join Date: Apr 2007
Chapter/Region: South East
Location: Huntsville, AL
Vehicle:
2007 WRX TR
TopSpeed Built =D

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Im not an expert but I think with that power level you will be fine on stock internals
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Old 06-23-2008, 12:42 AM   #3
RankFrank
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2006 WRX
WRB

Default

good to know; just figured that a block swap at the same time as the tranny would be cheaper than doing it separately.
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Old 06-23-2008, 10:26 PM   #4
RankFrank
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Member#: 60682
Join Date: Apr 2004
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
2006 WRX
WRB

Default

looks like I'll be getting a 20G turbo and large IC, then working within those limitations. Should have more than 325whp potentialwise, so I can dial it up a bit if I want.
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