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Old 11-25-2012, 09:54 PM   #51
kellygnsd
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Anything could be made to work if you throw enough money and time at it. Running AVCS heads and cams without AVCS control is sub optimal since your intake cam centerline will be more retarded than normal. Modify the cams and run non-AVCS cam gears solves that problem.
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Old 11-26-2012, 04:30 PM   #52
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So running the cam without AVCS (retarded position) would make the engine work better up high or down low?
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Old 11-26-2012, 07:09 PM   #53
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Quote:
Originally Posted by renhoek View Post
So running the cam without AVCS (retarded position) would make the engine work better up high or down low?
Up top.

On AVCS car you advance the cam in low rpm and bring it back to 0 ( full retard ) in higher rpms
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Old 11-26-2012, 07:10 PM   #54
. o 69 o .
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if you use can non avcs cam gears they would be center, you could adjust them manually with adjustable aftermarket cam gears
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Old 11-27-2012, 04:43 AM   #55
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Thanks guys. I have a race only car that I am building a hybrid for, so it sounds like the 2005 AVCS heads I have will work just fine. Rarely do we get below 3000rpm.
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Old 11-27-2012, 11:41 AM   #56
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Does anyone know if you can put ej205 cams in ej257 heads? I ask because that would be a good fix for the lazy cam profile of the ej257 cams running without AVCS.
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Old 11-27-2012, 01:03 PM   #57
kellygnsd
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Originally Posted by Soarer View Post
Does anyone know if you can put ej205 cams in ej257 heads? I ask because that would be a good fix for the lazy cam profile of the ej257 cams running without AVCS.
From what I was told the cam profile is the same as the STi cams but the lift is less so it would probably be better to just modify the STi cams to work with non-AVCS cam gears. I've sold a few STi cams to WRX folk who did just that.
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Old 11-27-2012, 01:13 PM   #58
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Quote:
Originally Posted by kellygnsd View Post
From what I was told the cam profile is the same as the STi cams but the lift is less so it would probably be better to just modify the STi cams to work with non-AVCS cam gears. I've sold a few STi cams to WRX folk who did just that.
I've got a set of Kelford 272 cams in my ej205 heads right now. I'm wondering if I can use ej257 heads and put in the Kelford cams with the ej205 cam gears. That way I could avoid having to send out my ej205 heads to be chamber matched and I'd end up with a set of heads that are less prone to cracking between the spark plug hole and valve hole. Thoughts?
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Old 11-27-2012, 01:30 PM   #59
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You can if you use the right parts. You can swap WRX and STi cams and cam gears all day in either head just use the correct cam seals for each application.
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Old 11-27-2012, 07:22 PM   #60
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Quote:
Originally Posted by Soarer View Post
I've got a set of Kelford 272 cams in my ej205 heads right now. I'm wondering if I can use ej257 heads and put in the Kelford cams with the ej205 cam gears. That way I could avoid having to send out my ej205 heads to be chamber matched and I'd end up with a set of heads that are less prone to cracking between the spark plug hole and valve hole. Thoughts?
I have been looking at exactly this right now and from what I have found, the answer is yes. I am still trying to figure out what oil ports need to be blocked. I believe a cam sensor also needs to be added to the head. This is a part that can be reused off your other motor, and apparently a bracket is available for the mounting.. you just need to drill and tap a hole to secure it to the motor
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Old 01-28-2014, 04:01 PM   #61
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Anyone know of a capable machine shop in vancouver bc
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Old 01-28-2014, 06:41 PM   #62
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I shipped my heads to ASF Machine in Colorado because they do exceptional work. I'm located in Massachusetts so it wasn't cheap. Might be something to look into.
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Old 01-31-2014, 06:34 PM   #63
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is 5/8" the correct size hose ??


nm found it ... :-)

Last edited by cueballsi; 01-31-2014 at 06:41 PM.
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Old 01-31-2014, 07:08 PM   #64
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very helpful
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Old 02-09-2014, 04:22 PM   #65
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I have a 2.5 06 short block. And the 05 Saab 9-2x Aero 5 speed 2.0l motor.. I am going to do the build in the spring...

My question is. I planned on using most of my original parts. I am using the ej205 heads from my car. And changing to the 6 speed transmission with STI cluster. I was hoping to do new STI head gaskets and timing belt kit ect.. The block has the oil pan and oil pump and water pump on it.

I was hoping I do not need to change ECU or wiring harness?? My car is custom tuned at stage1 right now and runs great. Any chance of me not gaining much from doing a hybrid build..

I have a ported polished turbo, cold air intake w/inlet hose, Aluminium radiator, cat back exhaust. Or do I do an uppipe only and tune to stage2

Thanks for the help..
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Old 02-10-2014, 01:52 PM   #66
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I'm running a built 257 with 8.5:1 pistons, ED's CNC heads, stock STI head gasket, 272 cams, full supporting mods and a Blouch DOM 1.5 xt-r. I made just over 350AWHP on 93 and 437 ON E85. The timing that I can run with these heads is awesome. Just over 22K miles with no issues.
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Old 02-10-2014, 03:49 PM   #67
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Quote:
Originally Posted by gfx2043 View Post
I'm running a built 257 with 8.5:1 pistons, ED's CNC heads, stock STI head gasket, 272 cams, full supporting mods and a Blouch DOM 1.5 xt-r. I made just over 350AWHP on 93 and 437 ON E85. The timing that I can run with these heads is awesome. Just over 22K miles with no issues.
And you think alot of timing adds up to alot of hp? Or that being able to run alot of timing is the way to go? Nvm, I just remembered this is nasioc.
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Old 02-10-2014, 04:12 PM   #68
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Originally Posted by fastblueufo View Post

And you think alot of timing adds up to alot of hp? Or that being able to run alot of timing is the way to go? Nvm, I just remembered this is nasioc.
Lol. There's a point of too much timing true. But in most regards the more timing you can safely run the better. Especially when your talking about hybrid setups that in some cases can't even run a stock timing map without knocking
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Old 02-10-2014, 05:01 PM   #69
fastblueufo
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Lol. There's a point of too much timing true. But in most regards the more timing you can safely run the better. Especially when your talking about hybrid setups that in some cases can't even run a stock timing map without knocking
Thats because static cr and quench play a large roll in affective cr with different octane fuels and also combustion chamber design. And not to leave out cam design that affects dynamic cr. An engine doesnt have to run alot of timing to make alot of hp. Ive seen cars run as little as a few * of timing and make lots ofpower
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Old 02-13-2014, 02:30 PM   #70
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I have tuned my share of hybrids, some are dissapointing and some not so. But when you have to retard the timing so much that the timing map doesn't look any where near what a 205 or 257 map is you can be certain that the combustion efficiency just isn't quite there. Timing also plays a large roll in telling how a motor behaving. Any time the timing can be advanced toward TDC you stand a good change to make more Hp, but by far the biggest gain is that you have a larger safety margin against detonation. Better ignition timing is a sign of more efficient / controlled combustion. This efficient combustion goes hand in hand with better fuel economy, more knock control, and better driveability. Since most hybrids struggle with detonation I feel that being able to run better timing is a big sign that the motor will not have to deal with detonation issues as much at any given power level.
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Old 02-13-2014, 04:30 PM   #71
mod maniac
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I built my ej 257 block with the je hybrid pistons. I used my ej205 heads with no chamber work. I installed bc 272 cams to help move the air and installed meth injection to cool the chamber. On a 20g it is making 371 awhp without meth and 398 awhp with the meth. Car runs great with no tuning problems.
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Old 02-27-2014, 07:48 PM   #72
cueballsi
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any one know what right idle pulley (the small one) should be used on my 2005 sti block ( 701 casting) and my 2002 wrx 2.0L heads for the timing belt???

I heard something about a double row idler????
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Old 02-27-2014, 09:49 PM   #73
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Quote:
Originally Posted by cueballsi View Post
any one know what right idle pulley (the small one) should be used on my 2005 sti block ( 701 casting) and my 2002 wrx 2.0L heads for the timing belt???

I heard something about a double row idler????
It is the updated subaru double bearing small idler that bolts to the timing belt tensioner. You should use that one not the single bearing roller designed one.
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Old 02-27-2014, 10:00 PM   #74
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Originally Posted by subi400 View Post
It is the updated subaru double bearing small idler that bolts to the timing belt tensioner. You should use that one not the single bearing roller designed one.
Does gates make a double bearing idler? Or do I need to go to the factory??? Any part numbers???

Anything else I should be watching for???
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Old 07-09-2014, 10:49 PM   #75
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Before starting a new thread, I figured I'd post up here.

I bought my car with the hybrid swap already done. The PO spun a bearing and was on a bit of a budget with the rebuild. This was my first dip into Subarus and obviously hybrid swaps. I didn't ask one of the most important questions: Were the heads chambered to match the 2.5l block?

I was satisfied with the power levels at the time, but have since developed the itch to go a bit bigger. I talked to the shop that did the swap and they weren't entirely sure if the heads were chambered. I also contacted the PO and he wasn't sure either.

From what I've read, the heads being chambered is a major contributor to knock and essentially not chambering the heads can lead to hotspots and is generally bad news if you want to make power.

So now I'm coming to you guys. Short of ripping the motor apart, is there any definitive way to tell if the heads were chambered?
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