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Old 01-18-2013, 12:35 PM   #151
dRaZ4H0iB
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Hello everyone. 2005 wrx 160,000 miles.. Pretty stock except cobb dp, perrin short ram and exhaust. A local shop in town is going to start my hybrid swap on monday. Heads should be sent in on monday as well. Getting a new 2.5 from the factory. Buying new intercooler, radiator, and hoses hopefully today off the internet. Not sure what turbo, injectors, or clutch (still stock trans. Original clutch). Leaning towards vf39 or an equivalent. It will be daily driver. Im not wanting 400 hp. Any advice? Tips?
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Old 01-18-2013, 12:43 PM   #152
DDScooby
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Quote:
Originally Posted by dRaZ4H0iB View Post
Hello everyone. 2005 wrx 160,000 miles.. Pretty stock except cobb dp, perrin short ram and exhaust. A local shop in town is going to start my hybrid swap on monday. Heads should be sent in on monday as well. Getting a new 2.5 from the factory. Buying new intercooler, radiator, and hoses hopefully today off the internet. Not sure what turbo, injectors, or clutch (still stock trans. Original clutch). Leaning towards vf39 or an equivalent. It will be daily driver. Im not wanting 400 hp. Any advice? Tips?
get a new(er) VF48 if you want to remain at a relatively stock level. At LEAST 545cc injectors; 650cc injectors for a little more "oompf" (top feed). Get a step above the OEM clutch (5MT). Even with a VF39,43 and 48 the stock clutch will slip more than likely. With stock STi (ej257 I'm assuming you're getting) pistons can't take much over what the VF48 can dish out. You can probably get away with a 16-18g turbo, but I wouldn't push it if you want to keep it safe.
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Old 01-18-2013, 02:56 PM   #153
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fast reply. thanks. i found a combo package on Import Image Racing for the turbo. comes with vf48, Deatschwerks 750 injectors (top feed) and walbro 255. im confused about the injectors though. will i need the top feed or the side feed injectors.
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Old 01-18-2013, 03:37 PM   #154
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Quote:
Originally Posted by dRaZ4H0iB View Post
fast reply. thanks. i found a combo package on Import Image Racing for the turbo. comes with vf48, Deatschwerks 750 injectors (top feed) and walbro 255. im confused about the injectors though. will i need the top feed or the side feed injectors.
Topfeed; only side-feed models were the 04-06 STi.

EDIT* you're gonna need a tune as well. Link up with a reputable tuner in your area and see about getting a Cobb accessport.
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Old 01-18-2013, 03:46 PM   #155
dRaZ4H0iB
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with it being a sti 2.5 short block from 04-06 with my 2.0 heads, would it still be topfeed? i have the cobb accessport and a tuner in Las Vegas, NV (only 1.5 hour drive) he's done a few hybrids.
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Old 01-18-2013, 04:00 PM   #156
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Quote:
Originally Posted by dRaZ4H0iB View Post
with it being a sti 2.5 short block from 04-06 with my 2.0 heads, would it still be topfeed? i have the cobb accessport and a tuner in Las Vegas, NV (only 1.5 hour drive) he's done a few hybrids.
Yep, still top feed. The 02-13 WRX has the injectors sitting in the TGV (Tumbler generator valves) feeding through the heads. So 02-05 WRX= 2.0l heads=top feed injectors. Unabomber has some FAQs in the 'General' section iirc that addresses what models use what injectors and why.

02-13 WRX: top feed
04-06 STi: Side-feed
07-13 STi: Top feed
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Old 01-18-2013, 04:09 PM   #157
dRaZ4H0iB
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and it all makes since now! thanks
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Old 01-24-2013, 12:12 AM   #158
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i have an exedy stage 1 heavy duty in my hybrid, my stock clutch slipped with a Td04 on 17 LBS, it holds good now, and isnt as beefy as an ACT would be on the gears
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Old 01-24-2013, 12:18 PM   #159
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Quote:
Originally Posted by Sivandor View Post
i have an exedy stage 1 heavy duty in my hybrid, my stock clutch slipped with a Td04 on 17 LBS, it holds good now, and isnt as beefy as an ACT would be on the gears
Do you get any clutch chatter with that Exedy stg 1? I have one and I do
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Old 01-24-2013, 03:00 PM   #160
chrisfromalbany
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Do you get any clutch chatter with that Exedy stg 1? I have one and I do
Would the ACT do any better?
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Old 01-26-2013, 11:34 PM   #161
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in first gear a little and reverse, but i like the way it drives otherwise, my chatter isnt bad its not to strong on the stock 5 speed, act is alot beefier
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Old 02-18-2013, 09:56 AM   #162
dRaZ4H0iB
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I just got my car back friday. Did the hybrid swap. I put the Act HD street performance clutch in. Ive only driven it 25 miles. No chatter. No noise at all. Not sure if you have to drive like a bat out of hell to get any noise to appear. Just a little stiffer than stock. I'm happy with it.
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Old 01-03-2014, 09:16 AM   #163
bbotl69606
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2004 wrx with 108xxx

Miles since installed: 3000

Engine mods: hybrid build (duh), ej257,2.0 heads, je pistons (8:5:1), Manley platinum series rods, Apr studs, king racing bearings, sti gaskets, ported FP68hta turbo, invidia up pipe ( cat less), perrin divorced downpipe, turbo back exhaust, Perrin turbo inlet, sti TMIC, DW 300lph fuel pump, DW750cc injectors, Cobb sri, Cobb electronic boost solenoid.

Other mods: group n motor mounts and tranny mounts, exedy stage 2 clutch, rebuilt transmission, ebc brakes (gotta stop somehow!)

No problems with my motor so far, runs strong until redline. Mustang dyno ( 336whp 322tq at 20 lbs) on 93 octane.

Last edited by bbotl69606; 01-03-2014 at 09:23 AM. Reason: forgot to put in year of the car!
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Old 01-27-2014, 01:07 PM   #164
gfx2043
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Mileage since installed: 22,000
Type Engine and Internals: Brand new 09+ STI short block, Mahle 4032 pistons, to many other parts to mention.
Valve-train: Eq cnc 2.0L heads, BC 272 cams, Manley valve springs
Head Gasket Choice: Stock STI
Tune: Tuned. 355 AWHP 352AWTQ on 93, 437AWHP, 430AWTQ on E85
Blouch 1.5XTR turbo
Current status: Runs like a champ.
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Old 01-27-2014, 03:38 PM   #165
Ryan314
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Quote:
Originally Posted by gfx2043 View Post
Mileage since installed: 22,000
Type Engine and Internals: Brand new 09+ STI short block, Mahle 4032 pistons, to many other parts to mention.
Valve-train: Eq cnc 2.0L heads, BC 272 cams, Manley valve springs
Head Gasket Choice: Stock STI
Tune: Tuned. 355 AWHP 352AWTQ on 93, 437AWHP, 430AWTQ on E85
Blouch 1.5XTR turbo
Current status: Runs like a champ.
Similar to my build. I've got about 35,000 on mine and mine is running like a champ too. Recently compression tested with 150 on all four cylinders
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Old 02-18-2014, 02:49 PM   #166
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good afternoon. figured id chime in. idk if im in the right spot or not..so if im not feel free to move me. i have an sf5 wagon with a swap. 93 ej22T bottom end, 2.5rs heads, vf39. currently on about 9/10lbs. 02 rex bluetops, wideband o2, tuned with an afc. i guess what i wanted to know is how reliable are these bottom ends are. i know its a closed deck block...and trust this isnt my first turbo vehicle, so i do monitor as much as i possibly can with gauges and such..but to my knowledge they are pretty stout motors. pulls quite hard too. its my daily so it doesnt get abused like this very often, but if i need to pass somebody, as long as they arent making crazy power, i will. can somebody give me a rough estimate of how much power im making? unfortunately i havent been able to get it on a dyno just yet..in due time hopefully. just by driving it though i can tell you that the torque has got to be higher than the horse. but i could be wrong. thanks!
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Old 07-02-2015, 02:01 PM   #167
02hybridwrx
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this thread honestly scared me once I read about all of the problems people have. I do not understand. I push my td04 and run my car hard daily as it is my dd and I like to drive fast.

Mileage since installed: 25,xxx
Type Engine and Internals: forged internals
valve terrain: stock 2.0 heads
Head Gasket Choice: Not sure on brand, i know it is thicker.
Tune: by steve at psi, pushing my injectors at 14psi
Current Status: great. pulls hard. My engine has always been a little noisy on the passenger side. Still running the td04 however I am putting a vf39 on it to help with back pressure.
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Old 07-08-2015, 04:59 PM   #168
maciek
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Mileage since installed: 3700
Type Engine and Internals: Ej257, stock internals, king bearings, decked 0.006"
Heads: ej205, all stock, decked 0.020"
Head Gasket Choice: Cosworth 1.1mm
350tq/330hp @ 19lbs (Td06-20G)

Current status: Running Good! Self tuned on Haltech Standalone + E85
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Old 08-13-2015, 12:12 PM   #169
02hybridwrx
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Made it to 30000 and now all cylinders miss fire. I think it's the ecu not the engine. Passes compression
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Old 07-17-2016, 03:50 PM   #170
Purpose_Built
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I remember this thread! My engine has about 40k on it when i pulled it out last week to swap the crank after the pulley bolt came loose and chewed it up, plus it also has a clutch issue. Tuned by me, built by me and no messing with the combustion chamber. 2 pistons were wiped with a rag and the other 2 werent. Zero signs of detonation, bearings were good and the heads are good. Also makes somewhere around 380whp







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Old 07-17-2016, 03:52 PM   #171
norcaltuna
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Cool thread (subbed)
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Old 07-27-2017, 06:14 PM   #172
JMlegacy
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Quote:
Originally Posted by Maxwell Power View Post
here is what I'm trying to explain in a really crappy MS Paint drawn picture.

Point A is the large quench pad that is created by placing a 2.5L bore on a 2L head. Point A on the non enlarged head has a greater quantity of exhaust gas passing that point in addition to a relatively stagnant pocket (B) just below it. When the piston moves to the top, that pocket is cleared out and the hot gasses are pushed up and around the corner at Point A. This causes the heat to be deposited into the head at that point which creates a hot spot that will cause detonation the next time the cylinder is filled and compressed. Also, filling that void around the corner takes more time and energy which can rob power. Someone might argue that the cool charge coming into the cylinder the next time around will cool off that hot spot. That is what I believe happens to a degree under light loads and when the intercooler is cooling the intake charge off significantly. Under high boost and heat soak conditions the spot will not be cooled sufficiently by the intake charge and that point will only get hotter and hotter.

In the cylinder on the left, the point A only has a small amount of gases flowing past it and the very small pocket (B) doesn't retain a lot of heat or stagnant gasses.

This is why Hybrids are so unreliable. You can have a 9:1 compression hybrid with a larger chamber and it would be leagues above a 9:1 compression hybrid with no chamber work in both power and reliability.

So maxwell, I thought the hybrid pistons took care of this problem?

I'm looking to do a Hybrid at the moment, already bought some parts. Need to buy gasket kit, timing belt and the JE pistons.
CNC is not an option at this moment!

Last edited by JMlegacy; 07-27-2017 at 06:28 PM.
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Old 11-26-2018, 01:35 PM   #173
uglyducklingbugeye
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I know that the ej205 and ej257 blocks are the same. If I do a hyrbid build, will the bolt on mods from my 2.0L bolt right on to the 2.5L block?
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Old 11-26-2018, 04:59 PM   #174
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Quote:
Originally Posted by uglyducklingbugeye View Post
I know that the ej205 and ej257 blocks are the same. If I do a hyrbid build, will the bolt on mods from my 2.0L bolt right on to the 2.5L block?
Ej205s and Ej257s motors are NOT the same... one is a 2.0L and the other is a 2.5... but most modifications are interchangeable
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Old 07-07-2019, 05:43 PM   #175
rhymeboy89
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Just something I feel I am noticing, most people here went with stock short blocks. If they had someone else do the work, it costs quite a bit of money to do this swap and build. So my .02 cents is that if you are thinking to drop a 2.5 block in, make sure to build it and do the heads from what I am reading. Reason I say that is the power output I'm seeing for all this money (250-300whp) is depressing for all the money that goes into that install. As well, a large number seems to be blowing their motors so in the end it costs double
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