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Old 08-01-2014, 11:17 AM   #1
Wcfd2509
Scooby Newbie
 
Member#: 360640
Join Date: Jun 2013
Chapter/Region: MWSOC
Location: Grand Forks, ND
Vehicle:
2000 Legacy L Wagon
Hunter Green

Default 240 WHP Build Piston Opinions

Hello,

Long story short, I am rebuilding an 04 STI EJ257 block. It is an Eaton supercharger setup. I live in North Dakota and it regularly dips down to -25 degrees.

I am currently in the position to get a brand new set of Arias pistons from a buddy of mine for $200. I am not scared of piston slap and I don't mind the noise.

I know the stock STI pistons will have no problem holding my power level, but I don't want to have to possibly tear the motor apart later because of a popped ring land. I am using a Greddy E-manage Ultimate for tuning. I will be running about 9 psi out of an M62 supercharger.

So my question is, should I stick with the OEM STI pistons, or get the Arias pistons.

Thanks.
Here's my build thread to get an idea of my setup.
http://forums.nasioc.com/forums/show....php?t=2594631
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Old 08-01-2014, 11:56 AM   #2
Nightmaresmk
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Member#: 281522
Join Date: Apr 2011
Chapter/Region: Tri-State
Location: Albany Ny
Vehicle:
05 Outback 2.5XT
Silver

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supercharger sti pistons are fine. you may want to bump the compression though.
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Old 08-02-2014, 05:41 PM   #3
Wcfd2509
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Member#: 360640
Join Date: Jun 2013
Chapter/Region: MWSOC
Location: Grand Forks, ND
Vehicle:
2000 Legacy L Wagon
Hunter Green

Default

Supercharger is still forced induction. Why would I increase compression? I have all of the torque in the world starting at 1400 rpm. I want less detonation so I need lower compression. 9 psi on the supercharger is about 515 cfm. Which is more than most vf series turbos flow. So 9 psi should yield about 220-250 whp on a conservative tune.


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