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WRX-maniac's Wonderful and Spectacular 2012 STi Build!!!

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5
BUILD LOG:
WRX-maniac's 2012 STi Limited Sedan




















The Story:
I traded in my 2011 WRX for this STi in June of 2016. It has been my dream to own an STI since I could drive. With finally owning one, my goals are to eventually end up making this car my weekend warrior/track car. Although I will have to DD it for a few years. My main focus will be making good horsepower, while building up the suspension and drivetrain components at the same time. Overall I just want this car to be everything I have always envisioned it to me in my mind, and have fun while doing it. Hope you enjoy!


The Car:
2012 Subaru STi Limited sedan
World Rally Blue
Chassis Mileage : 70,102
Built motor mileage : 12,013

FULLY BUILT, ROTATED TURBO GOODNESS/ 3rd Place car at 2022 Import Nationals in Carlisle PA


710whp @40psi on E85
582whp and 518wtrq @ 28psi on pump 93



Current Modifications:

Short block:
-V4 closed deck from Outfront Motorsports
-Manley platinum series forged pistons (oversized 99.75)
-Manley turbo tuff I-beam rods
-ACL main and rod bearings
-ARP 1/2 inch head studs
-new STi nitrate treated crankshaft
-Secondary air pump delete w/Andrewtech block off plates


Oiling Components:
-Killer B ultimate pick up
-Killer B oil pan and baffle
-New STi 11mm oil pump

Heads:
-Kelford 272 camshafts
-Supertech Dual Valve Springs set
-Supertech Spring Seat Locatorset
-Supertech Titanium Retainer set
-Multi-Angle valve job
-Adjusting valve clearance
-Disassemble and Assemble Cylinder heads (includes valve stem seal replacement)
-Deck cylinder heads


Engine/Exhaust/Performance Mods:
-KillerB Holy Header
-Turboxs rotated turbo kit
-Garrett GTX3582r gen 2 turbo
-ETS 4 inch core FMIC w/ powder coated wrinkle black piping
-Tial 38mm external wastegate
-Tial Q 50mm bov
-Speed density sensor
-MAF sensor (to read air intake temps only)
-ETS catback (with mufflers, no resonator)
-Cobb Accessport V3
--Aeromotive A1000 manual fuel pressure regulator
-Cobb fuel pressure sensor
-Grimmspeed 3 port ebcs
-ID1700cc injectors
-Radium dual pump hanger with dual walbro 450's

-IAG AOS (comp. series) in Red
-IAG TGV deletes in Black
-IAG v3 fuel rails in Red w/ IAG fuel lines
-Cobb 4-BAR map sensor
-Cobb flex fuel sensor
-Fuildampr dampening crank pulley
-Koyo Radiator with GS radiator hoses
-DEI turbo blanket

Ignition Upgrades:

-NGK one step colder plugs
-OTL Performance street series coil packs


Brakes-Current setup:
-GoodRidge Gstop Stainless steel brake lines
-Motul 5.1 brake fluid

-DBA 4000 series drilled and slotted rotors
-Hawk HPS pads

Exterior/Aesthetic:
-Perrin 2 inch shorty antenna w/ navigation
-IAG front license plate delete plate
-Debadged trunk
-Grimmspeed license plate relocater
-Vinyl overlays for tail lights. Red blinker overlay and smoked reverse light
-Subaru JDM R205 Black Side Ornaments
-20% window tint, plus windshield strip
-Gloss black window chrome deletes
-JNA Performance C-Style polyurethane front lip
-APR Carbon Fiber front wind splitter
-Flex Fuel badge
-Downforce solutions v2 rear diffuser
-Downforce solutions side skirt extensions
-OLM RS style gurney flap in gloss black
-Gloss black subaru emblems with white stars
-Verus Engineering hood scoop block off plate
-Verus Engineering hood louvers

Drivetrain/Transmission/Suspension:
-ACT Xtreme Duty Performance Street clutch kit and new FHI oem flywheel
-Kartboy short throw shifter + bushing kit
-Turn in Concepts transmission crossmember bushings
-Turn in Concepts Shifter Pivot bushings
-Group N Transmission mount
-Perrin Pitch Stop Mount
-Cygnus Performance X-1 coilovers. Motorsport edition (9k/9k)
-IAG competition series engine mounts (90A durometer bushings)
-2015+ STi steering rack and pinion
-Whiteline Steering Rack bushings
=Cusco rear strut tower brace


Engine bay dress-up:
-Perrin Rad Shroud in Red
-Perrin pulley cover in Red
-Perrin ebcs cover in Red
-Perrin fender shrouds in Red
-
Perrin battery tie down in Black
-Billetworkz Zero Series Black engine bay caps

Interior:
-JBL club 6520 front door speakers
-SMY Dual gauge cluster
-AEM UEGO wideband AFR gauge
-AEM oil pressure gauge

-SMY 52mm accessport mount
-SOLiDMods 52mm vent pod
-Autostyled Black Leather shift boot w/ red stitching for short shifter
-Autostyled Black Leather E-brake boot w/ red stitching
-Billetworkz weighted shift knob
-FactionFab carbon fiber and leather "D" shaped steering wheel
-Braum Elite-S Racing seats
-Idoing head unit


Wheels and Tires:
-Enkei PF09 in vanquish white (18x9.5 +40)
-BFGoodrich G-Force Sport Comp 2 tires (235/40/18)

The Future:

Engine/Exhaust/Performance mods:
-Process West reverse/track intake manifold

Drivetrain/Transmission/Suspension:
-Whiteline rear diff positive power kit inserts
-Whiteline rear subframe inserts
-Whiteline roll center kit
-Cusco sway bars and endlinks
-Cusco front strut tower bar
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I'm guessing (based on the original unit) that your car has the upgraded stereo from the factory?
Yes mine came stock with the touchscreen nav unit
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Yes mine came stock with the touchscreen nav unit
Not familiar with the options on the GR gen. Does that mean you also have a separate amp and subwoofer to contend with?
Definitely brought my old interior into this century as far as technology goes. Never thought I would have wireless apple carplay in this car haha.
A wireless apple carplay head unit was my favorite upgrade so far. It has had the biggest impact on my in car driving experience.
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Well, went to Carlisle import and performance nationals over the weekend. It rained the whole time and was pretty miserable. But there was still a great showing of all kinds of badass cars. My STi placed 3rd place again this year.

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Niiiiice.
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Congrats! Beautiful STi!
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So I decided to do some maintenance and suspension stuff to the STi. I will be going to andrewtech next month for fresh transmission and rear diff fluid change. Also adding their rear diff cover.

I also just ordered the cusco rear strut tower brace. So that will be going on in a couple of weeks. Ill add pics as always.

Also thinking about the future of the STi. I spoke with andrewtech for a little while today and came up with a few extra mods to help boost the performance of the car. This winter I will be doing the process west track/reverse intake manifold. Of course with this I will be losing my AC. But i rarely use it, and i mean rarely. I can count on one hand how many times I have used my AC over the last couple of years. So deleting it for the sake of shorter intercooler piping and for the sake of performance is worth it. So I will be changing the intake on the car, getting completely rid of the maf sensor (currently running hybrid maf and speed density), and going with a straight iat speed density setup. Will help clean up some of the wiring around the intake area. Will just be a like 45 degree 4 inch pipe with a filter on the turbo. So that, the manifold and having a good friend of mine who welds and fabricates his own car parts make the intercooler piping I need. So doing that over the winter this year and be taking it for a refresh on the tune next spring.
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Received my JDM goodness cusco rear strut bar today. Will be installing over the next week or so. Pics will be coming soon.
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So got the rear strut bar installed. Should have taken more pics. But I took the bar off and just loosely mounted the brackets on top of the strut tower. Used a paint marker to mark the trunk mat and cut with a Dremel. Overall was pretty easy.













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Nice clean fit.

So how much do you think the intake change and the move speed density will get you?
Nice clean fit.

So how much do you think the intake change and the move speed density will get you?
Going away from the hybrid set up and changing the intake alone would probably net me pretty much nothing. But matching with the process west reverse manifold and saving almost 2 feet of intercooler piping will help a good bit. Hoping to get close to the 750whp mark. I was told after the last tune that with the big turbo and cams that the stock intake manifold is limiting some power up top but it's not really a choke point. As many people run the stock manifold and make more power. But with my current set up and the amount of boost I am running I will definitely gain some power throughout the powerband. From some research it seems most people with similar builds net anywhere from 20-50whp when upgrading the intake manifold.
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Going away from the hybrid set up and changing the intake alone would probably net me pretty much nothing. But matching with the process west reverse manifold and saving almost 2 feet of intercooler piping will help a good bit. Hoping to get close to the 750whp mark. I was told after the last tune that with the big turbo and cams that the stock intake manifold is limiting some power up top but it's not really a choke point. As many people run the stock manifold and make more power. But with my current set up and the amount of boost I am running I will definitely gain some power throughout the powerband. From some research it seems most people with similar builds net anywhere from 20-50whp when upgrading the intake manifold.
That is not insignificant.
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That is not insignificant.
Right, it will be a little noticeable bump in power. The biggest gain will be the shorter intercooler piping so quicker spool and response time.
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