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Old 03-18-2009, 09:07 PM   #1
Crazy650
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Member#: 109498
Join Date: Mar 2006
Chapter/Region: South East
Location: Florida, boynton beach
Vehicle:
05 Wrx turned STI
WRB

Default going to build a hybrid

going to take a 2.5 short block and put wrx heads on it is there anything special i well need?

thanx in the end i want to make 350whp dd
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Old 03-18-2009, 09:21 PM   #2
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

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New Head Gasket (Compression purposes)
Various Gaskets
Shims
2.5L Oil Pump
New water pump
May need new head studs
New Timing Belt, Accessory Belts
Resurface/replace clutch and/or flywheel
Turbo - 18G or bigger
Good Tune

I am sure there is more but thats off the top of my head. Also, I highly recommend some forged pistions (i.e. CP). I know a great tuner/builder in Miami (Gregg at Machines Gone Wild) if your interested.

Last edited by csmithwrx'05; 03-18-2009 at 09:30 PM.
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Old 03-19-2009, 12:11 AM   #3
Crazy650
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05 Wrx turned STI
WRB

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got a tuner and got a shop to do this at brand new in boynton shop (= 5mins from me
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Old 03-19-2009, 12:16 AM   #4
W0R2X
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i have this setup also, minus the larger turbo, the parts listed above are pretty accurate.
i would recommend replacing the head bolts as they are supposed to be one time use.
im using STi head gaskets, but a lot of people go with Cometic for different thickness.
the engine gasket kit isnt a bad idea either, since you never know what you will need.
get a new TO bearing with that clutch.
and make sure you check your valve clearances, there is a formula to figure out which shims/buckets you need. ask your local subaru dealership.
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Old 03-19-2009, 01:06 AM   #5
csmithwrx'05
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Vehicle:
'05 WRX Hybrid
EJ257 w/Blouch 18G 8cm^2

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Quote:
Originally Posted by Crazy650 View Post
got a tuner and got a shop to do this at brand new in boynton shop (= 5mins from me
Brand new shop????

How experienced is the builder/tuner? Has he done a lot of WRX/STi builds?

B/c I would not trust a hybrid build to just anyone or just some regular performance shop. MGW (who built my hybrid) specializes in building/tuning WRXs, STis, and Evos.

Also, I would definitley have a discussion with your builder about forged pistons and if you like holding your power to 7k+ RPM some aftermarket cams (i.e. Tomei 252s or Kelford 264s).

IMHO if you want 350whp build the motor to handle 450whp, so it will last and you can drive the piss out of it.

Last edited by csmithwrx'05; 03-19-2009 at 01:16 AM.
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Old 03-19-2009, 03:44 AM   #6
Thug Nasty
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Quote:
Originally Posted by W0R2X View Post
shims/buckets you need. ask your local subaru dealership.
Only our 02/03's use shims + buckets. All newer use shimless buckets.
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Old 03-19-2009, 03:20 PM   #7
Crazy650
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05 Wrx turned STI
WRB

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been doing sti builds for 3 year's in his own house just got his on shop, Im going to use 05 wrx head's on a sti 08 short block, one of the other member said be a good idea to run forged if i dont he said i get alot of knock not a good thing at all. looking to do this right the frist time.
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Old 03-19-2009, 10:20 PM   #8
Crazy650
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05 Wrx turned STI
WRB

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bump for more info
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Old 03-20-2009, 08:18 AM   #9
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one of the more discussed topics on this forum, hit the search key and learn.
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Old 03-20-2009, 10:11 AM   #10
scprs
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the 05 sti block has been proven to be the strongest according to jorge at IAG
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Old 03-20-2009, 02:26 PM   #11
Fongers
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for 350, I think any ej25x block will be fine to build on (5 or 7). Just find one in good shape with no cylinder wall damage/cracks/etc and you'll be good...
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Old 03-21-2009, 06:01 AM   #12
joeschmoe714
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aspen white

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[quote=csmithwrx'05;26001867]New Head Gasket (Compression purposes)
Various Gaskets
Shims
2.5L Oil Pump
New water pump
May need new head studs
New Timing Belt, Accessory Belts
Resurface/replace clutch and/or flywheel
Turbo - 18G or bigger
Good Tune


this is my hybrid setup.

05 wrx heads (deshrouded, 3 angle pnp, crawford racing spec cams, oem valvetrain)
brand new ej25 block, sti crank, rods, mahle 100mm pistons
12mm oil pump
oem water pump
sti gasket kit
crawford racing wrx street clutch
custom gt30 turbo kit
ecutek
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Old 03-21-2009, 11:01 AM   #13
sleeperrex
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Join Date: May 2002
Location: san diego
Vehicle:
2002 wrx/hybrid
silver

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Quote:
Originally Posted by csmithwrx'05 View Post
Brand new shop????

How experienced is the builder/tuner? Has he done a lot of WRX/STi builds?

B/c I would not trust a hybrid build to just anyone or just some regular performance shop. MGW (who built my hybrid) specializes in building/tuning WRXs, STis, and Evos.

Also, I would definitley have a discussion with your builder about forged pistons and if you like holding your power to 7k+ RPM some aftermarket cams (i.e. Tomei 252s or Kelford 264s).

IMHO if you want 350whp build the motor to handle 450whp, so it will last and you can drive the piss out of it.
Yeah, i would be careful about who does the build. Make sure they understand how to tune for one. Don't take it to 2 different places like i did. One did the build and the other did the tune. Even if they are reputable.

Had to have my engine pulled a second time to remove aftermarket cams because the tuner had diagnosed the cams as being the problem for engine knock on my hybrid. Took it to another tuner and got it running right.
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Old 03-21-2009, 09:43 PM   #14
Crazy650
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Join Date: Mar 2006
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Location: Florida, boynton beach
Vehicle:
05 Wrx turned STI
WRB

Default

thanx for the info it alot of help thankyou
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Old 03-23-2009, 10:02 PM   #15
wrxdrivr04
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FP EVOIII 16g

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Quote:
Originally Posted by scprs View Post
the 05 sti block has been proven to be the strongest according to jorge at IAG
+1 also according to Andrewtech Automotive!

justed finished up my hybrid build 05 sti s/b amd 04 wrx heads!!!!
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Old 03-23-2009, 11:20 PM   #16
Crazy650
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Chapter/Region: South East
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Vehicle:
05 Wrx turned STI
WRB

Default

just a update on my parts are a sti short block out of a wrx 06. 05 wrx head's
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