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Old 04-13-2009, 11:53 PM   #1
Scooby Scammer- Do Not Buy From User
Member#: 194555
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Idaho
1997 GC8 coup

Default thinkin bout doin a build

ello, im new to subaru building, and well tuning in general. my old car was an 89 240sx with a SR20.

anyways, onto the questions i have. right now i have a 97 Coup that im planning on dropping a EJ20K motor/drivetrain into. already started on all the wiring on the vehicle. planning on caging and painting the car while its stripped down.

my goal is to have about 375hp to the wheels and capable of 9-10k rpm (its at 7.9k right now), its a semi-daily driver and will also be used at the track so reliability is somewhat of an issue (i have another car i drive as well).
while the motor is on the shop floor i figured i would build the bottom end now, so i would only have the heads to deal with later when im ready to push for the goal.

planning on doing a FMIC and new turbo later on (running the stock VF49 for a while), new injectors, equal legnth headers, up-pipe, possibly partial meth, bigger fuel pump (has the factory V4 STi fp right now, not sure what that maxes out at though)

already has a HKS DP and hi-power exhaust.

mmmm....advice, thoughts?
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Old 04-14-2009, 01:10 AM   #2
sense of nature
Scooby Guru
Member#: 112759
Join Date: Apr 2006
Chapter/Region: MWSOC
Location: In the V hole!
2004 Stock OEM AsFu*


What size turbo do you plan on running?Why the 9-10 k rev desire ?
I hope you have alot of contacts or very deep pockets /
From my experience , unless your running a diesel truck sized turbo you can make gobbs of power w/ a 7k-8500 k rev limit & it will be alot more reliable & cheaper
Just my .02
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Old 04-14-2009, 01:30 AM   #3
Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
1990 Legacy wagon
goes 12.387 @ 116.5


Here is/was my route to 300-375 whp....

2.5 block. PHASE 2 though, but can be NA or STI, doesnt matter. NAs are cheap.
97mm throw crank. NA or turbo, doesnt matter. Get it polished
STI rods. They are cheap used, still cheap new....
ACL or TOGA bearings
Pistons, ANY brand but stock STI (cause you will break STI pistons as you are not a stock ECU and will see knock somewhere/sometime)
BIGGER than you need injectors.
ANY DOHC heads. Even NA if thats all you can get, still make big power out of them.
Dual pressure plate and 6 puck to hold the power as you are cable, not hydro and don't have options....
FMIC is a given.

Live with the stock RPM limit unless you have deep pockets.

I am currently making about 300/300 @ 15 psi for $3000 in the family 1990 Legacy wagon. Thats cost of parts, no labor.

NA block, $150?
Mahle pistons $450 (although I only paid $28 via a raffle!!!!!)
STI rods and crank $150
Bearings $100
FMIC kit came with stainless piping, couplers and BOV $225
Clutch kit $200
Ebay turbo $<200
Oil feed line $35
550cc injectors (free, modded my stock NA ones)
twin turbo heads $250-400
intake manifold (NA) $50
down pipe back Exhaust $150
Up and down pipe $20 materials
Heat wrap $40
Modded MAF $80 (free to me, I am the one that sells them )
Air filter $50
Greddy Trust MBC $50 (used off ebay)
Gauges $50 (Boost and AFR narrowband)
Misc $150
Perfect Power 6 piggy back $250
Borla Header $250

So at least $3000....
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Old 04-14-2009, 04:13 AM   #4
Scooby Scammer- Do Not Buy From User
Member#: 194555
Join Date: Nov 2008
Chapter/Region: NWIC
Location: Idaho
1997 GC8 coup


everyone seems to be running either the 2.5 or the 2.2 blocks, are the EJ20's that hard to make power with?
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Old 04-14-2009, 04:22 AM   #5
Scooby Specialist
Member#: 183634
Join Date: Jul 2008
Chapter/Region: RMIC
Location: At the "B"
02 wrx/ 92 ss
Booze fueled :)


Displacement is the easiest way to gain power, spools everything faster.. you get the idea. The 2.0 block is huge everywhere else besides the US, we just got shafted with our 205. Your route will be just fine, Do some re-search and figure out why everyone says stay at near stock rpms or win a lotto...
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Old 04-14-2009, 11:32 AM   #6
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Member#: 118239
Join Date: Jun 2006
Chapter/Region: SCIC
Location: Beijing and Venice Beach
2002 Built Wagon
Wife- 2004 Outback SE


ditch the 9K revs. That will cost you and extra $4-7K alone. 375 is very doable but stick with a built 2.5 block and use a 20g+ turbo (ideally, go with a dom 3 30/35r). With supporting mods, that will get you there ~$5K if you buy wisely (used parts for turbo/breathing mods).
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Old 04-14-2009, 12:12 PM   #7
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Member#: 132130
Join Date: Nov 2006
Chapter/Region: TXIC
Location: Austin, Texas
2002 Ford F-150
Graphite Gray


ditch the ej20K and get an ej205/255/257 etc

the ej20k will limit your tuning options unless you go standalone or you have a newer jdm ej207 which is supported w/ ecu flashing (ie; ecutek, opensource,etc)

i would start with an ej205 swap, put the big turbo on and run it till it blows then step up to a 2.5L
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