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Old 07-23-2012, 12:03 AM   #126
danger1138
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Quote:
Originally Posted by Nickarub
How much is this head chamber work cost? Do most people skip it just cuz the hassle?
I sent my heads to "NF PERFORMANCE" and they offered me two options of chamber work, 51 cc and 56cc. Prices were very reasonable and im glad i did it. No knock even when running high boost. If i remember correctly the 51cc was $225 and the 56cc option (which leaves u at stock sti compression ratio) was $450... The only thing that sucked was the downtime, being that im in NY and there in MINNESOTA.
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Old 07-23-2012, 01:48 AM   #127
Jirv311
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I did send my heads out. I just smoothed out/rounded out all sharp edges in the combustion chambers. I'll let you know in a few days how she runs.
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Old 07-24-2012, 02:06 AM   #128
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Quote:
Originally Posted by Nickarub View Post
How much is this head chamber work cost? Do most people skip it just cuz the hassle?
It can be dirt cheap if you do it yourself. We used a burr and a flap wheel in a die grinder. Put the 2.5l headgasket on the head, trace the circle of the fire-ring, and stay within it when opening up the combustion chamber to the 2.5l dimensions. We had a couple pictures of the 2.5l heads to go by and it took a couple hours to get the heads done. Make sure the CC's of each combustion chamber match and it should be good to go.

The heads we did this on already had cracks around the spark plug holes, so a shop wouldn't have touched them anyway. The engine runs great.
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Old 10-26-2012, 09:24 PM   #129
Impressed wagon
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Mileage since installed: 0
Type Engine and Internals: Acl Rod bearings, with Wiseco pistons Drop in 20k original miles on EJ257
Valve-train: Stock valves with EQ CNC heads
Head Gasket Choice: OEM EJ257

Current Status: Building now. Rotated 20g for now with 40mm compgate wastegate and V-mount intercooler with flipped intake manifold, TGV deletes tuned on E85
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Old 10-27-2012, 01:55 AM   #130
amazonparrot
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2003 Impreza WRX
Hybrid 2.5 / Aspen White

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Mileage since installed: 39k
Type Engine and Internals: Stock EJ257
Valve-train: Stock valves with EQ CNC heads
Head Gasket Choice: OEM EJ257

Current Status: Running strong for two years and counting! Just was dynoed at 274/315.

Last edited by amazonparrot; 11-28-2012 at 12:54 PM.
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Old 10-27-2012, 07:01 PM   #131
Purpose_Built
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This thread must not be that lame because it keeps coming back. Lol. (cough maxwell)

Had to change my pcv setup because the car was consuming oil during heavy boosting. What i learned so far is this;

1. Dont block the center crank vent on the block. Vent it somehow

2. I have some mileage on my block and didn't need to reshape the heads for the power i make but i have forged piston and only use 93 oct. 18psi daily

3. Stock wrx cams suck so much on the 2.5 block and my car falls on its face

4. Modded injectors suck and you will see what i mean when you switch to id1000's or something similar. My car is just smoother after running two different sets of modded injectors.

5. Extra torque makes you realize how much slop is in your stock suspension

Still going strong in a car with 230k on the odometer. Engine was installed around 206k i think and i have a td06h-60-1 running 18psi daily.Not much but it gets the job done
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Old 10-27-2012, 07:04 PM   #132
cueballsi
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Quote:
Originally Posted by Purpose_Built
This thread must not be that lame because it keeps coming back. Lol. (cough maxwell)

Had to change my pcv setup because the car was consuming oil during heavy boosting. What i learned so far is this;

1. Dont block the center crank vent on the block. Vent it somehow

2. I have some mileage on my block and didn't need to reshape the heads for the power i make but i have forged piston and only use 93 oct. 18psi daily

3. Stock wrx cams suck so much on the 2.5 block and my car falls on its face

4. Modded injectors suck and you will see what i mean when you switch to id1000's or something similar. My car is just smoother after running two different sets of modded injectors.

5. Extra torque makes you realize how much slop is in your stock suspension

Still going strong in a car with 230k on the odometer. Engine was installed around 206k i think and i have a td06h-60-1 running 18psi daily.Not much but it gets the job done
What rpm do you hit full boost? What size exhaust housing?
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Old 10-28-2012, 12:36 AM   #133
Purpose_Built
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Quote:
Originally Posted by cueballsi View Post
What rpm do you hit full boost? What size exhaust housing?
3600 in 2nd and less in third. I actually didnt know so when i went to pick up some food i checked. Second gear is all i can do aggressively on these city streets. The housings are 2.4front and 8cm rear.
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Old 11-15-2012, 01:35 PM   #134
triniscoob
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Ok id like to ask:

I have been reading about how there is a difference between the EJ207 and the Ej257 heads in the way that they Breathe, also the EJ257 appears to have an extra vent on the center,
id like to ask, can someone explain to me the actual difference between the heads and their breathing? im simply trying to understand why im getting excessive CCV pressure on my hybrid.
If it has been answered before i apologise for asking again, i dont mean to offend anyone or seem like a pest.

thanks in advance
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Old 12-13-2012, 02:00 PM   #135
subiedrivaa
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Anybody know where you can pick up a built ej257 off the internet?
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Old 12-13-2012, 02:59 PM   #136
Purpose_Built
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Quote:
Originally Posted by subiedrivaa View Post
Anybody know where you can pick up a built ej257 off the internet?
There are a bunch of horror stories on here. Company x built my motor and now they wont give me back n dollars. Its very hard to deal with a company thats 10 states away when you want something done about your blown motor.
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Old 12-13-2012, 04:04 PM   #137
tja1618
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Quote:
Originally Posted by Purpose_Built View Post
There are a bunch of horror stories on here. Company x built my motor and now they wont give me back n dollars. Its very hard to deal with a company thats 10 states away when you want something done about your blown motor.
Yeah that always rubbed me the wrong way. Forunately I have a few shops to choose from in the area, and they are all well qualified. Even if the remote builder knows his stuff up & down, their ability to help customers with problems is usually seriously diminished.

I'd try to see if you can find a builder somewhere in the area, even if it's a few hours drive.
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Old 12-13-2012, 07:27 PM   #138
5280HybridXT
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Here are my heads from a previous hybrid build.

i saved myself the trouble and just bought the 2.5 heads







hope the pictures arent to big.
edit: not the pitting on the face

can anyone explain what happened here? or has it already been explained.
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Old 12-14-2012, 01:16 AM   #139
subiedrivaa
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Quote:
Originally Posted by Purpose_Built View Post
There are a bunch of horror stories on here. Company x built my motor and now they wont give me back n dollars. Its very hard to deal with a company thats 10 states away when you want something done about your blown motor.
Well i know of shops here that could do work on it.
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Old 12-14-2012, 01:41 PM   #140
Purpose_Built
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Quote:
Originally Posted by 5280HybridXT View Post
Here are my heads from a previous hybrid build.




can anyone explain what happened here? or has it already been explained.
What caused you to replace the motor? I find it odd that its 1 chamber on each head that looks like that. What do the corresponding pistons and plugs look like? I'm guessing they were pretty ****ed because the head is alot tougher than the pistons. I need more.
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Old 12-17-2012, 10:31 PM   #141
triniscoob
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Quote:
Originally Posted by triniscoob View Post
Ok id like to ask:

I have been reading about how there is a difference between the EJ207 and the Ej257 heads in the way that they Breathe, also the EJ257 appears to have an extra vent on the center,
id like to ask, can someone explain to me the actual difference between the heads and their breathing? im simply trying to understand why im getting excessive CCV pressure on my hybrid.
If it has been answered before i apologise for asking again, i dont mean to offend anyone or seem like a pest.

thanks in advance
ANYONE ANYONE?

I have been told that if i use more radical CAMS that it helps but how exactly do they differ? venting of the systems i mean
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Old 12-18-2012, 08:57 AM   #142
Purpose_Built
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Quote:
Originally Posted by triniscoob View Post
ANYONE ANYONE?

I have been told that if i use more radical CAMS that it helps but how exactly do they differ? venting of the systems i mean
I know more aggressive cams give you less vac at idle but i don't know how that would make a difference under boost. My car only burned oil when my right foot remained down.
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Old 12-18-2012, 09:36 AM   #143
biodude
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Quote:
Originally Posted by triniscoob View Post
Ok id like to ask:

I have been reading about how there is a difference between the EJ207 and the Ej257 heads in the way that they Breathe, also the EJ257 appears to have an extra vent on the center,
id like to ask, can someone explain to me the actual difference between the heads and their breathing? im simply trying to understand why im getting excessive CCV pressure on my hybrid.
If it has been answered before i apologise for asking again, i dont mean to offend anyone or seem like a pest.

thanks in advance

I dont understand the question, I know my 207 heads have the same amount of breathers on the valve covers as the ej257, and I'm fairly certain the 207 block uses the same crank case breather that the 257 has. so I don't see why you would be able to connect everything a if it were stock.
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Old 12-27-2012, 04:08 AM   #144
subiedrivaa
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So if you do a 2.5 hybrid build do you need a new ECU also?
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Old 12-27-2012, 08:40 AM   #145
DDScooby
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Quote:
Originally Posted by subiedrivaa View Post
So if you do a 2.5 hybrid build do you need a new ECU also?
no. As long as you have a reliable and talented machinist that can chamber the EJ205 heads to the block, then you don't even need to reflash the ecu**.

**I could get flamed for that, however, my brother's WRX has absolutely no performance mods and has a hybrid motor with ~50k on it.
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Old 12-27-2012, 09:56 AM   #146
danger1138
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Quote:
Originally Posted by DDScooby

no. As long as you have a reliable and talented machinist that can chamber the EJ205 heads to the block, then you don't even need to reflash the ecu**.

**I could get flamed for that, however, my brother's WRX has absolutely no performance mods and has a hybrid motor with ~50k on it.
U def need a tune. What does the 2.0L ecu do to compensate for the extra .5L of displacement on the ej257 block? I dont know how your bro's still driving that thing with no issues.
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Old 12-27-2012, 02:07 PM   #147
Purpose_Built
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Quote:
Originally Posted by danger1138 View Post
U def need a tune. What does the 2.0L ecu do to compensate for the extra .5L of displacement on the ej257 block? I dont know how your bro's still driving that thing with no issues.
^^THIS!!!^^


Your car will not run right at all.
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Old 01-09-2013, 12:41 AM   #148
subietech6403
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Default je pistons

how are the je fsr pistons for hybrid setup?planning to do a build with new 257 block,je pistons and new 2.0 heads without machine combustion chamber on heads?jeremy at je said i wouldnt need to?anyone done this setup before?
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Old 01-11-2013, 01:35 AM   #149
Sivandor
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Mileage since installed: 31k since i bought the car, not sure how many before i owned it, when i bought the car i did not know it was a hybrid, but the car has been very solid and is a DD, each time it has been tuned mikey has told me the car runs amazingly well with no knock even loading up in 5th, do you guys think i should go to a 39 with low boost just to help exhaust flow?
Type Engine and Internals: 257 short block, not sure of internal
Valve-train: believed to be stock 02 wrx heads
Head Gasket Choice: not sure

Current status: Car is running strong and sti mikey tuned on td04 around 290wtq and 250 whp at 17.4 psi
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Old 01-11-2013, 03:00 PM   #150
Purpose_Built
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Remember that the stock pistons are super weak
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