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Old 08-07-2008, 06:39 PM   #1
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 2.0L to 2.5L Shortblock Build/ Turbo Options?

Long story short my 2.0L shortblock is done and I am going with the following:

2.5L Shortbolck (EJ25)
Kelford Cams
CP Pistons
Cosworth Headgaskets
Valve Springs
Head Studs
Oil Pump
Walburo 255 Fuel Pump
Perrin TMIC
Perrin Turbo Inlet
DW 660CC or 750CC Injectors

I am unsure of which turbo to get, as all my research has been for 2.0L and I need to make a decision ASAP. I was reading that an 8cm turbine housing was better for the 2.5L, as it helps against boost creap (is that true?).

So I was thinking either:

Big Evo III 16G w/ 8cm turbine housing or
18G w/ 8cm turbine housing

This car is my daily driver, and I autox occasionally so lag is a concern. My goal is around 300whp with a conservative/safe tune, but I don't really care about HP #'s, just want it fun to drive. Also, my tranny is stock '05 Tranny, I don't drag, launch too hard, or generally shift like an ass, but don't want too much power to grenade my tranny. So???
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Last edited by csmithwrx'05; 08-07-2008 at 06:54 PM.
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Old 08-07-2008, 06:54 PM   #2
Endymion
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Member#: 91595
Join Date: Jul 2005
Chapter/Region: MAIC
Location: PA/WMD
Vehicle:
2009 08STi, 07CS

Default

Be wary of buying an FP. Blouch Dom 2.5 or 3 would get my cash with your setup.
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Old 08-07-2008, 07:01 PM   #3
csmithwrx'05
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Join Date: Feb 2008
Chapter/Region: South East
Location: Miami, FL
Vehicle:
'05 WRX Hybrid
EJ257 w/Blouch 18G 8cm^2

Default

Quote:
Originally Posted by Endymion View Post
Be wary of buying an FP. Blouch Dom 2.5 or 3 would get my cash with your setup.
I am planning on Blouch. But, the DOM 2.5 is way more turbo than I need or even want. I'm looking for a max of 350whp and will be very happy with low 300s. It would be too easy to grenade my tranny with a Dom.

Last edited by csmithwrx'05; 08-07-2008 at 07:32 PM.
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Old 08-07-2008, 07:58 PM   #4
All4bSpinnin
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Member#: 99102
Join Date: Oct 2005
Chapter/Region: South East
Location: Jax, FL
Vehicle:
08 Corvette Z06
problem Traction?

Default

one thing i would look at...

make sure the CP pistons are matched to the cyclinder heads of the non AVCS 2.0 motor... the normal sti piston design is specific for the ej257 head.... not the 2.0 head... crawford offers pistons that match the combustion zone of the head

i believe these are the pistons...

http://store.crawfordperformance.com/store/products/27
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Old 08-07-2008, 08:12 PM   #5
csmithwrx'05
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Join Date: Feb 2008
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Location: Miami, FL
Vehicle:
'05 WRX Hybrid
EJ257 w/Blouch 18G 8cm^2

Default

Quote:
Originally Posted by All4bSpinnin View Post
one thing i would look at...

make sure the CP pistons are matched to the cyclinder heads of the non AVCS 2.0 motor... the normal sti piston design is specific for the ej257 head.... not the 2.0 head... crawford offers pistons that match the combustion zone of the head

i believe these are the pistons...

http://store.crawfordperformance.com/store/products/27
IC. I will talk to my mechanic. Getting everything done at Machines Gone Wild in Kendal, FL. I have heard good stuff about his work and I don't have the sizes/numbers on the Pistons or the cams yet, as he said he was going to call CP and Kelford to get the right sizes for my setup.

Last edited by csmithwrx'05; 08-07-2008 at 08:20 PM.
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Old 08-07-2008, 11:25 PM   #6
urfsin
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Location: Santa Barbara
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2005 Outback XT
Golden Thunder

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If you want a good auto-x / street turbo, don't go with anything over a 20G.
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Old 08-08-2008, 10:50 AM   #7
Stames_wiltz
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Join Date: Mar 2007
Chapter/Region: RMIC
Location: Utah
Vehicle:
2006 WRX TR
Obsidian Black Pearl

Default

APS SR30 sounds to be the turbo you are looking for. Slightly better flow than the VFxx turbos so you will be right in that near or slightly above 300 whp range and will have full spool by 2750 rpm. Full ball bearing spool from hell, it makes the turbo cars feel near NA. Fun Turbo for sure.
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