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Old 11-06-2013, 06:48 PM   #1
m.bryant
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Join Date: Feb 2012
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Location: Pleasant Hill, IA
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2007 Legacy GT SpecB
DGM

Default The “O’Kirin” Build: ’07 Spec.B - Destroked w/ Outfront Closed Deck Block

Goal is 850+WHP!

I’m part of a very active club and at any given time there are several cars undergoing upgrades and heading towards the 500-600 whp mark. This Spec.b is very similar to the STI when you look at drivetrain and available mods but the one obstacle I will always face is weight. This thing is a pig compared to the STI and especially the swapped RS coupes running around in the area. If I match them mod for mod I will always have the extra weight slowing me down so it’s time to jump out front and let them follow me for a while!

Every effort is being made to keep this car reliable. Yes, I’ve seen the 3 part equation and I know that reliability is the first thing to go out the window but every effort is being made to build a car that performs on the street but can seriously drop some jaws at annual Subaru meets and shootout events. I am well aware that there will likely be part failures and breakdowns…I’ll be prepared for them $$$

Probably the biggest decision so far was what direction to go for the block. I was close to pulling the trigger on a sleeved block a few months ago but decided against it after an exhausting amount of research and combing threads. I’ve decided that a closed deck block would be the best option for trying to hold the level of power I’m going for. They started out building high hp motors to play in the sand and at some point started supporting street cars. No risk of dropped sleeved, full support around the combustion area of the cylinder…seemed like a no-brainer to me. From what I understand there hasn’t been an actual block failure yet. This should be a good test.

Outfront will be balancing the full rotating assembly, building the short block, machining my heads and doing the complete valve job. They will be trying to take some pictures for me along the way…I hope to make this a pic heavy build thread as we get farther along.

Short block details:
Outfront’s V3 Closed deck EJ25 block
Cross-drilled EJ207 stock crank
Manley turbo-tuff I-beam rods
Manley 100mm destroke pistons
ACL rod bearings (came with rods)
King XPG main bearings
½” Outfront head studs

Heads/valvetrain:
D25 heads
GSC S2 cams
GSC +1 valves
GSC beehive springs

Once the short block arrives I’ll finish up the long block here. The plan is to install the new motor and clutch in December to start the break-in. By the time spring comes we’ll be ready to boost this thing to the moon!

A few parts going in with the new engine:
OE water pump
OE 11mm oil pump, shimmed
Gates t-belt kit
Tomei billet t-belt guide
Killer B pan, pickup and baffle
Group N motor and trans mounts
Group N pitchstop
Exedy twin disk
Quaife Helical Front LSD *added to the list


While I’m breaking in the new motor I’ll focus on supporting mods that will need to be in place before the turbo kit goes on. Fuel system w/swirl pot, brake upgrades, additional gauges, etc. Plenty of projects to keep me busy for a couple months!

Turbo upgrade will come during spring time. I’m going with the Borg Warner EFR 9180 twin scroll setup from Full-Race. The numbers I’ve seen coming from that turbo seem like a perfect fit for this build...looks like it keeps building all the way to the top! Goal would be to run 30-32 psi on my “daily driving” map and 40-42 psi in kill mode. Might have to drop to “I-mode” for my daily commute hahah.

I know this is an ambitious build but I am all in and have been building plenty of support from those involved. I look forward to the feedback and I’ll post updates and pictures whenever I can.
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Last edited by m.bryant; 11-25-2013 at 01:03 PM.
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Old 11-06-2013, 06:49 PM   #2
m.bryant
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2007 Legacy GT SpecB
DGM

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Old 11-06-2013, 06:54 PM   #3
gcooper9
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2013 WRX
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In to see results!!! I would love to see how high the destroked motor will rev!
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Old 11-06-2013, 06:56 PM   #4
jnorth85
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2000 580Whp The RSTI
SRP

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I'm ready for the ride buddy! Let's do this!
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Old 11-06-2013, 08:00 PM   #5
The_Mu
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2013 WRX STI
Plasma Blue Pearl

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Yessir!! Can't wait to see pics!!
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Old 11-06-2013, 08:01 PM   #6
25rsti
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3 turbos &n NA
@DBlockSTi

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Old 11-06-2013, 08:29 PM   #7
mrchyes
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98 Forester
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looks like a lot of fun dude! My RS wants to cruise sometime with this beast
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Old 11-06-2013, 08:33 PM   #8
2.5GTLegacy
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2005 SWP LGT

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pics! stat!
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Old 11-06-2013, 08:47 PM   #9
m.bryant
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2007 Legacy GT SpecB
DGM

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Quote:
Originally Posted by 2.5GTLegacy View Post
pics! stat!
Haha...just talked to a photographer buddy of mine. We are going to go out and do a shoot in the next week so I will have plenty of "before" pics.
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Old 11-06-2013, 08:51 PM   #10
m.bryant
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DGM

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AND...Outfront will be taking some pics as they work too so I'll throw some of those up soon.
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Old 11-07-2013, 10:41 AM   #11
TH motorsports
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95 Impreza L-ish
Blueish Green

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I would do better rods. My 2 cents!
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Old 11-07-2013, 11:20 AM   #12
WhatTurboLag?
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Better rods? Turbo tuffs are pretty ducking strong.


That being said, are they long rod turbo tuffs? I've been trying to find more info on them.
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Old 11-07-2013, 11:24 AM   #13
m.bryant
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2007 Legacy GT SpecB
DGM

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Quote:
Originally Posted by WhatTurboLag? View Post
Better rods? Turbo tuffs are pretty ducking strong.


That being said, are they long rod turbo tuffs? I've been trying to find more info on them.
Standard length rods, I know nothing about the long rods...sorry!

And I agree, from what I've gathered the turbo tuffs are pretty well known as the standard for 250hp per rod builds. Many options out there but info gets pretty scarce.
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Old 11-07-2013, 01:05 PM   #14
WhatTurboLag?
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Yeah all the big high hp builds I've seen that haven't blown up are all on turbo tuffs.


Everything else has broken lmao
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Old 11-09-2013, 02:20 PM   #15
dragon-wagon
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Silver Stone Metallic

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Nice. Good luck with the build Mike. I can't to see this in person once its completely finished.
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Old 11-09-2013, 04:38 PM   #16
LucasCairns
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So excited to see how this goes! Good luck!
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Old 11-09-2013, 05:33 PM   #17
04ImprezaWRX
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850+? I'd keep the extra displacement with the 79mm crank and I would definitely ditch the S2 cams for S3.
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Old 11-10-2013, 11:08 PM   #18
m.bryant
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2007 Legacy GT SpecB
DGM

Default

Quote:
Originally Posted by 04ImprezaWRX View Post
850+? I'd keep the extra displacement with the 79mm crank and I would definitely ditch the S2 cams for S3.
I actually did consider the s3 cams and called GSC to go over my build with them. The s3 would gain a little up top but not worth trading the smoother idling s2 for a daily driver. We'll see what happens in the future though....
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Old 11-10-2013, 11:49 PM   #19
m.bryant
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Vehicle:
2007 Legacy GT SpecB
DGM

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I was on the dyno this weekend with my current setup...just thought I would share the "before".

3rd gear: 345whp/387wtq
All my tuning is done by Graham @ Boosted Performance Tuning

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Old 11-19-2013, 02:29 PM   #20
jnorth85
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2000 580Whp The RSTI
SRP

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Pics of the closed deck needed !! Where is the progress
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Old 11-19-2013, 02:59 PM   #21
taiekchi
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Aspen White

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Man where are the pics??????
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Old 11-19-2013, 03:08 PM   #22
m.bryant
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Vehicle:
2007 Legacy GT SpecB
DGM

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I know!! Send mail to sales@outfrontmotorsports and ask Jeremy for pics, I'm sure he'd love that Lord knows I've been harassing him enough by phone!

I guess they are almost done machining for the 1/2" head studs. My full rotating assembly has been balanced and is ready for the block. The heads are almost finished as well.

I'm itching to get this thing back to my house!!!
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Old 11-19-2013, 03:11 PM   #23
gandalf666
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This should be a nice build!
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Old 11-19-2013, 03:43 PM   #24
m.bryant
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2007 Legacy GT SpecB
DGM

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Quote:
Originally Posted by gandalf666 View Post
This should be a nice build!
Thanks, I completely agree
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Old 11-19-2013, 04:15 PM   #25
Scuby04STi
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2004 STi GTX3076R
Rally Blue

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Interesting, be fun to watch regardless of outcome. Always like the shoot for the moon builds they are generally very informative. Subscribed
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