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Old 11-06-2020, 11:01 PM   #1
naked_dave1
Scooby Newbie
 
Member#: 301692
Join Date: Nov 2011
Location: Pewaukee
Default 2012 WRX EJ25 Rebuild - Parts List/Recommendations

Cylinder 3 is basically dead, very little compression. Not 100% sure of the issue (vales, piston, etc) But, I always want to build up my motor and now seems like a good time.

I will be doing all the work myself (with help from Subaru tech friends) and want your thoughts to make sure I'm headed in the correct direction with parts and compatibility.

Goal is to daily along with some autocross, rallycross, and ice racing. Not looking to push the limits with power, but have it as reliable as it can for a built motor. I don't have a set power goal in mind.


Existing Parts
  1. Re-use EJ255 case halves (if nothing is wrong with them)
  2. Re-use Stock heads w/ machining (if nothing is wrong with them)
  3. COBB Tuning Downpipe Catted Bellmouth
  4. COBB Tuning Uppipe
  5. Mishimoto Black Top Mount Intercooler w/ Red Hose
  6. GrimmSpeed Boost Control Solenoid
  7. Turbosmart Recirculating Blow Off Valve Kompact Plumb Back Black
  8. DeatschWerks DW65c Series Fuel Pump w/ Install Kit
  9. Subaru GR Hatch Quad Exit AxleBack Exhaust
  10. Group N 5-speed Trans Mount
  11. Group N Subaru Motor Mounts

New Parts
  1. Subaru OEM Full Gasket and Seal Kit
  2. GrimmSpeed Turbo to Downpipe Gasket
  3. GrimmSpeed Uppipe to Turbo Gasket
  4. Manley Performance Platinum Series Piston Set 99.5mm 8.5:1
  5. Manley Performance Forged Connecting Rods
  6. Subaru OEM Forged Salt Bath Nitrated Crankshaft
  7. ACL Race Main Bearings Standard Size
  8. ACL Race Rod Bearings Standard Size
  9. Killer B Motorsport Oil Pickup and Baffle Combo
  10. Subaru 2.5L Oil Pump
  11. ARP Head Stud Kit 11mm
  12. Gates Racing Timing Belt Kit w/ Water Pump
  13. Subaru OEM Timing Belt Tensioner
  14. Alternator Belt - Subaru (809218450)
  15. AC Belt - Subaru (11718AA082)
  16. NGK Iridium Spark Plugs One Step Colder 2309
  17. Subaru OEM Thermostat
  18. Torque Solution Top Feed TGV Deletes (Silver)
  19. Torque Solution Air Pump Delete Plate Set
  20. ACT Heavy Duty Performance Street Clutch Kit w/ Streetlite Flywheel
  21. Subaru Genuine OEM Oil Filter = x3
  22. Motul Break-In Oil 10W-40 = x10
  23. Shell Rotella T6 5W-40 = x5
  24. Subaru OEM Super Coolant = x2
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Old 11-24-2020, 09:20 AM   #2
GeoNV
Scooby Newbie
 
Member#: 518830
Join Date: Sep 2020
Chapter/Region: RMIC
Location: Colorado
Vehicle:
2009 WRX
dark grey metallic

Default

this is basically everything I've got for my build I'm doing now. I found the stock ACL bearings were too tight on oil clearance and had to get the extra oil clearance bearings. otherwise, looks like you've got a good and thorough list.
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Old 12-07-2020, 01:43 AM   #3
tarwrxheel
Scooby Newbie
 
Member#: 501410
Join Date: May 2019
Chapter/Region: MAIC
Location: Philly/South NJ
Vehicle:
2013 WRX
WRB

Default

Great list! What fuel injectors? My 13 rebuild is similar to yours.
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Old 12-07-2020, 01:49 AM   #4
naked_dave1
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Member#: 301692
Join Date: Nov 2011
Location: Pewaukee
Default

Quote:
Originally Posted by tarwrxheel View Post
Great list! What fuel injectors? My 13 rebuild is similar to yours.

Wasn't sure I was going to need them, looks like I am. Still looking into which ones and size.
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Old 12-07-2020, 03:16 AM   #5
tarwrxheel
Scooby Newbie
 
Member#: 501410
Join Date: May 2019
Chapter/Region: MAIC
Location: Philly/South NJ
Vehicle:
2013 WRX
WRB

Default

Quote:
Originally Posted by naked_dave1 View Post
Wasn't sure I was going to need them, looks like I am. Still looking into which ones and size.
Consider leaving extra room to run E85 (it’s addictive haha) hard to argue against ID1,300’s etc. I think most top brand injectors are good? Not positive just my guess!
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Old 12-08-2020, 10:00 PM   #6
iWrench2
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Member#: 509983
Join Date: Dec 2019
Chapter/Region: RMIC
Location: Salt Lake City
Vehicle:
2009 Impreza WRX
Dark Blue

Default

I just finished rebuilding the EJ25 for my '09 WRX, stock with a new factory short block, and a few things which you may not be thinking about for replacement that you should while you have it apart.

* All engine hoses (water/pcv/vacuum) This will add something like $250 because there are a lot of hoses and they're mostly pre-molded, but you don't want to reuse old, hard hoses and risk them cracking out later

* The turbo down pipe to mid pipe gasket isn't included in the OEM gasket kit, so you'll need to buy that separate.

* All new timing pulleys, not just the tensioner. Cheap insurance, and being an interference engine, timing is critical!

Also, order a tube of the Three Bond 1217G gasket maker and get a tube of anti sieze for the exhaust and turbo bolts/nuts.
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