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Old 06-20-2007, 12:20 PM   #1
Kenji815
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2005 05 Varis WRX
95 LS400

Default Hybrid 2.5L short block build Q's

I'm looking to build a hybrid motor due to some unfortunate motor problem.

Car is 2005 WRX originally with EJ20
I'm looking to do the following

Bottom end 2.5L short block swap.
deautchwerks 750 cc injector or PE 800 cc injector
Walbro 255 fuel pump
ARC FMIC
and some sort of short ram intake. (HKS SMF Maybe....)
Tuning will be either ecutek or ap street tuner.
The car still be using the stock EJ20 top end stock and 5MT Transmission. (yes i know i know i already did all the reading in regards to weakness of the transmission)

Turbo in consideration
FP Green 8cm - 2.4" inlet internal waste gate
Deadbolt 20G / TD05 8cm
Blouch 20G / TD05 (Should be same or similar to deadbolt setup)

Any suggestion to the setup? am i missing anything?
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Old 06-20-2007, 01:48 PM   #2
wrxfactor
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6spd, EJ255, VF39 & EWG

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Make sure there hasn't been any damage to the heads. Are you building it yourself or trusting it to a shop?
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Old 06-20-2007, 01:51 PM   #3
Kenji815
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reputable shop is building it.
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Old 06-20-2007, 02:00 PM   #4
wrxfactor
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Forgot to ask, why are you shelling out big money for an ARC FMIC but leaving the tranny alone?
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Old 06-20-2007, 02:45 PM   #5
Kenji815
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transmission is on the list.. just haven't decided.. i'm still doing my research
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Old 06-21-2007, 12:23 AM   #6
eggpattern
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Build your heads. Look at any hybrid dyno chart and see why, it's like throwing a rock over a cliff.

At least new cams. Wrx cams will not support your turbo.
I used sti cams and modded them(get a machinist to plug 4 holes on end of intake cam)

I used cometic .051 to adjust compression of sti shortblock. ride5000 will be right behind me talking about "squish". I chose to have the right compression instead of right "squish" and you should too as long as you're running a bigger turbo.

Arp studs.

Last edited by eggpattern; 06-21-2007 at 12:28 AM.
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Old 06-21-2007, 08:05 PM   #7
skimobile
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Are you going with a "built" shortblock (Crawford, cosworth, etc) or just a stock Subaru STi block?
Forged Pistons?
STi oil pan, oil pickup, STi dipstick? Are you going to run headers because some require the STi pan for clearance.
Timing Belt....
Cams, valves & valvetrain?
The list can go on and on......
New oil pump and water pump?
You may also need a Perrin big MAF intake...
Mine did in order to properly tune it with ECUtek.
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Old 06-21-2007, 08:23 PM   #8
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wow nice plans hope to see it come to life
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Old 06-21-2007, 08:25 PM   #9
Kenji815
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I will be using
subaru oem 2.5L short block
2.5L oil pan, baffle, oil pick up, dip stick
stock exhaust manifold.
stock EJ20 top end (cams, valves etc)
Cosworth oil pump and sti water pump
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Old 06-22-2007, 12:18 AM   #10
Tom W
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You might be on a buget, but I recomened you swap in some cams or port your EJ20 heads. You'll see more power and quicker spoolup for your turbo, I recomened Kelford cams I heard good things about there cams

Tom
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Old 06-22-2007, 12:04 PM   #11
Kenji815
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With the amount of power i'm planning to put down (280-350 whp)
Cams seems to be a very expensive investment to get that extra few gain in spoolup. (around $800-1000)
I'm trying to stay within a budget but build a reliable daily driven and weekend track warrior motor.
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Old 06-22-2007, 01:29 PM   #12
Tom W
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Thats what i doing to with my 04 WRX Wagon. But looking to make about 400hp and still be a reliable Daily driven, road race, drag race car. it depends on the turbo i chose
are you keeping your 5spd or going 6spd? iam swaping to a 6spd
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Old 06-22-2007, 01:35 PM   #13
Kenji815
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For now i'm staying with the 5 speed.
Budget reasons.
In the future i willl upgrade to PPG or 6 speed.

What turbo are you thinking about to make 400 whp?
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Old 06-22-2007, 01:46 PM   #14
quikie
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have you purchased your shortblock yet? go to this website thekingofparts.com got the whole sti motor with everything wp, op, and the engine gasket set. its 2000 for the whole thing, and depending where you live i cost me total 2200. i had a budget of 3200 but i decided to be safe and get cams and a new valverain, doing the swap my self should be done by middle of next week. GL
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Old 06-23-2007, 02:13 AM   #15
Tom W
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Right now iam looking at a rotated GT30R or somthing similar to it. If you can think of anything let me know

Tom
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Old 06-23-2007, 10:49 AM   #16
ayobreezie
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I hear rotateds aren't very good for road racing...
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Old 06-23-2007, 03:00 PM   #17
Kenji815
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Default

Quote:
Originally Posted by Tom W View Post
Right now iam looking at a rotated GT30R or somthing similar to it. If you can think of anything let me know

Tom
that's a good choice.
GT30R is definitely a good turbo.
I didn't want to change to rotated setup (budget reason)
I think FP Green or Deadbolt TD05/20G will satisfy my need.
I'm looking for fast spool, linear power (around 300 whp).
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Old 07-04-2007, 05:11 PM   #18
Kenji815
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Default

Project update.
The motor is out of the car.
Parts to be installed
2.5L Short block swap
2.5 Oil pan / pick up / dip stick / baffle
Modified oil pump
Machine the stock EJ20 head.



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Old 07-04-2007, 05:33 PM   #19
cellobro
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hmmm sr-30+640cc=?
I has teh Endless BBK.

Default

good for you, with the sti oil pan, I just KNOW you're going with equal/length headers, ya...?
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Old 07-05-2007, 01:09 AM   #20
Kenji815
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Nope.. i love the boxer sound.
with the 2.5L oil pan , it will maintain the oil level better at high G
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Old 07-28-2007, 11:48 AM   #21
Kenji815
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Default

Alright so i got my EJ257 shortblock installed with all the original EJ20 components.
The car is untuned right now, just cobb stage 2 (EJ20)
The car has a very rough idle.
Any insight on this?
i know i definitely need a tune for the ecu to properly run the ej257
Could the rough idle cause by something else?
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Old 07-28-2007, 08:09 PM   #22
Drink
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Sounds like mapping to me.

Run what ever map you had for the 2.0, as fueling requirements are the same for the 2.5 as long as you stay out of boost.
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Old 07-28-2007, 10:50 PM   #23
jaxscuby
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those injectors..
maf scaling has to be adjusted
injector data also has to be tinkered
but you need a tune
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Old 07-29-2007, 02:12 PM   #24
edo2000
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Quote:
Originally Posted by Kenji815 View Post
Project update.
The motor is out of the car.
Parts to be installed
2.5L Short block swap
2.5 Oil pan / pick up / dip stick / baffle
Modified oil pump
Machine the stock EJ20 head.
I'm thinking of doing a similar hybrid. What machine work did you do on the EJ20 head? What head gasket did you use?
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Old 07-29-2007, 02:39 PM   #25
Kenji815
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Quote:
Originally Posted by jaxscuby View Post
those injectors..
maf scaling has to be adjusted
injector data also has to be tinkered
but you need a tune
yeah i think i need a tune also.
i'm actually running stock WRX injectors right now.
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