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Old 09-11-2010, 04:10 AM   #1
supranite90
Scooby Newbie
 
Member#: 240847
Join Date: Mar 2010
Chapter/Region: MAIC
Location: Nuketown, USA
Vehicle:
2011 STi
DGM

Default hybrid motor problems?

I've been in the tuning scene for a bit, but being this is my first Subaru I have a question I would like answered, no matter how complicated the answer may be. So my question is, what would be the main problem/thing to look out for when building a hybrid motor? This is with an 04 wrx and the shortblock i will be using is coming out of a 2.5 Legecy...
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Old 09-11-2010, 05:32 PM   #2
csmithwrx'05
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Member#: 171293
Join Date: Feb 2008
Chapter/Region: South East
Location: Miami, FL
Vehicle:
'05 WRX Hybrid
EJ257 w/Blouch 18G 8cm^2

Default

1st off how much power are you looking to make & what is your budget?

I am not an engine builder, but I have been running a hybrid for over 2 years. I would have to say the biggest issues are compression, clearences (piston/wall), oiling, and knock/detonation.

For compression you will need a thicker headgasket or better yet contact Equillibrium Tuning for their services. For clearance you will need the right pistons, personally I have custom spec CPs. Oiling issues can be helped both with the right clearances and a good oil pan and pickup (06+ Sti pan and killerB pickup). Lastly, knock/detonation should not be an issue if you have a really good tune and run the right compression.
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Old 09-12-2010, 03:43 AM   #3
supranite90
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Member#: 240847
Join Date: Mar 2010
Chapter/Region: MAIC
Location: Nuketown, USA
Vehicle:
2011 STi
DGM

Default

well i'm gunna be only pushing maybe 18 - 20 psi on the tdo4 if it (the turbo) can handle it. i'm not looking for big power atm just something reliable because its my daily and I'm having a hard(ish) time finding a EJ205. Plus the labor/parts is gunna run me about the same amount anyways i decided to go hybrid. Will i need to swap out the pistons or should i worry more about the compression?
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