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Old 12-01-2008, 02:18 AM   #1
Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
1990 Legacy wagon
goes 12.387 @ 116.5

Default Results for a temporary NA build using STI pistons....

So until I get the turbo parts all lined out, intercooler sorted, yada yada yada, I am running my new motor NA.

Its an NA block with Mahle 100mm pistons (STI compression), 99 DOHC Legacy Subaru 3-ply metal head gaskets, earlier than 1997 twin turbo heads, unknown year 2.5 NA intake manifold.

Other than an irritating idle issue (likely a vacumn leak), the motor runs great! More torque and power than a 2.2. But how does it compare to a higher compression build? Not as good. But it still has enough torque to have fun with for the next 500 or so miles till I get the turbo stuff sorted.

Build thread here.

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Old 12-01-2008, 07:58 AM   #2
Scooby Guru
Member#: 5218
Join Date: Mar 2001
Chapter/Region: MWSOC
Location: SAUL'S Motorsports
96L Most Over-
Developed Beater


That's encouraging!

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Old 12-01-2008, 10:46 AM   #3
Scooby Specialist
Member#: 150732
Join Date: Jun 2007
Chapter/Region: NWIC
Location: Chicago/Malmstrom AFB


you going to dyno that motor??i guessing you're not cause it'd be a waste to dyno before you put it all together, i just wonder how much difference those pistons make!@##@!
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Old 12-01-2008, 02:16 PM   #4
Back Road Runner
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Member#: 60082
Join Date: Apr 2004
Chapter/Region: MWSOC
Location: Minnesota
2004 Forester STI


Could even road dyno it with romraider and data log lab on the cheap (cost of a cable)
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Old 12-01-2008, 02:18 PM   #5
Matt Monson
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Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
99 2.5RS, '85 911
'73 914 and 2012 BRZ


Originally Posted by Back Road Runner View Post
Could even road dyno it with romraider and data log lab on the cheap (cost of a cable)
Can romraider talk to a 1990 Legacy ECU?
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Old 12-01-2008, 06:20 PM   #6
Scooby Specialist
Member#: 187834
Join Date: Aug 2008
06 2.5i impreza


why didn't you sub the 4ply head gaskets and didn't those get recalled or changed. don't think it can well maybe it can just not adjust anything on the ECU..I really don't know.
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