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Old 02-25-2008, 12:31 PM   #1
IllNastyImpreza
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Default highest CR Subaru engine ??

I"m weighing out my options for my rally car build. Not sure If I'm going FI or high CR NA.

Who of you out there are running high CR engines?

What kind of power are you making? whats your CR ??

mods ??

is it necessary to upgrade rods & pistons? or do you find your stock rods are adequite... I would assume cross drilling your stock crank is prefered in order to up your redline a bit.
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Old 02-26-2008, 02:47 AM   #2
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sorry to ask, but what is CR?
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Old 02-26-2008, 08:47 AM   #3
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Compression Ratio
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Old 02-27-2008, 04:36 AM   #4
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i haven't seen many upgrades out there that go much passed 11:1 or so. i know mine is 9.7:1 or 10:1.
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Old 02-27-2008, 08:46 AM   #5
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i run a stock sti short block with 11.7
power is 150 t accross the board and 187 hp with the 06 intake manifold
spin the motor to 7500 every day around town and have no issues
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Old 02-27-2008, 02:34 PM   #6
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Quote:
Originally Posted by Vmiz View Post
i run a stock sti short block with 11.7
power is 150 t accross the board and 187 hp with the 06 intake manifold
spin the motor to 7500 every day around town and have no issues
awesome

must have some decent punch... is that wheel HP ???
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Old 02-27-2008, 06:28 PM   #7
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Quote:
Originally Posted by Vmiz View Post
i run a stock sti short block with 11.7
power is 150 t accross the board and 187 hp with the 06 intake manifold
spin the motor to 7500 every day around town and have no issues
Whats so special about the 06 manifold?
Any more info on it?

Sorry for the higjack
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Old 02-27-2008, 06:32 PM   #8
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I know where there is a motor that runs 13:1 and has 300 hp all N/A for sale if anyones intrested.

Josh
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Old 02-27-2008, 07:18 PM   #9
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Quote:
Originally Posted by Guerice View Post
Whats so special about the 06 manifold?
Any more info on it?

Sorry for the higjack
better runner design, better overall flow vs. other N/A intake manifolds.
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Old 02-28-2008, 01:41 AM   #10
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And arent they plastic, for lower intake charge temps....
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Old 02-28-2008, 08:42 AM   #11
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And arent they plastic, for lower intake charge temps....

no in 2008 they changed over to plastic i believe but in 06/07 they were still metal.
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Old 02-28-2008, 09:46 AM   #12
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Sent a pm about this.

Quote:
Originally Posted by Whiteghost 2.5 View Post
I know where there is a motor that runs 13:1 and has 300 hp all N/A for sale if anyones intrested.

Josh
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Old 02-28-2008, 10:43 AM   #13
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I would LOVE to see this '06 Manifold's runners. Is it something along the lines of the WRX manifold? BIG runners like that?
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Old 02-28-2008, 01:50 PM   #14
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Quote:
Originally Posted by Whiteghost 2.5 View Post
I know where there is a motor that runs 13:1 and has 300 hp all N/A for sale if anyones intrested.

Josh
I would love to build something like that...

what block did they start out with ??
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Old 02-28-2008, 04:41 PM   #15
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Old 02-28-2008, 05:11 PM   #16
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if you are serious about N/A power.. you need to read the N/A white paper write up.. I remember when it was posted a few years.. very very informative.. it basically covers every aspect of N/A power.. have a look.. it should be a sticky.

http://forums.nasioc.com/forums/show...ighlight=paper
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Old 02-28-2008, 05:13 PM   #17
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HIGH COMPRESSION PISTONS

This is the big dog of mods. Not necessarily because of power gains, of which there are good ones, but because of the work necessary to do this. The pistons raise the compression of the EJ25 from its decent 10:1 ratio to some where near 11.2:1 for street purposes. Anything beyond this requires high octane race gas to run correctly as well as standalone EM. At the 11.2:1 level the motor will require good quality premium all of the time. It has been brought to my attention that 12:1 compression may be the safe limit for 93 octane use. But a quality EM system is highly recommended, otherwise engine may BOOM!

This mod usually requires that the bottom end be beefed up. This means better main bearings, better rods and forged crankshaft for reliability. The pistons themselves cost around $700 -$800. TWE shows $719 on their site just for the pistons. The additional block work and parts will likely run another $700 - $800 assuming you do the assembly.
Additionally some owners are using the Sti’s EJ257 block as it has the necessary reinforcement already. New Sti Blocks cost about $1700 though used ones can be had for around $1000.
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Old 02-28-2008, 10:48 PM   #18
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I might even end up just doing the frankenstien build... anyone remember the CR it produces on the 2.2 heads ?? and approximate HP ???
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Old 02-29-2008, 04:22 AM   #19
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Quote:
Originally Posted by FuJi K View Post
I would LOVE to see this '06 Manifold's runners. Is it something along the lines of the WRX manifold? BIG runners like that?
Find any N/A '05-07 EJ25 and there's the manifold. Not too hard to find.

Quote:
Originally Posted by SURF4ME View Post
HIGH COMPRESSION PISTONS

This mod usually requires that the bottom end be beefed up. This means better main bearings, better rods and forged crankshaft for reliability. The pistons themselves cost around $700 -$800. TWE shows $719 on their site just for the pistons. The additional block work and parts will likely run another $700 - $800 assuming you do the assembly.
I assume that came from the "white paper"? Not the most technically correct stuff there. New bearings are a good idea on any engine rebuild/upgrade, but the stock rods and crank should be perfectly fine, particularly at the power levels we're talking. Of course, you can be crazy like me and do lighter rods and piston pins, too (but I'll still be using the stock Phase II N/A crank).

Quote:
Originally Posted by IllNastyImpreza View Post
I might even end up just doing the frankenstien build... anyone remember the CR it produces on the 2.2 heads ?? and approximate HP ???
Too bad you couldn't search for info on the frankenstein build, as it's never EVER been discussed in dozens of threads in this forum and the Built Motor forum and the Subaru Conversions forum.

As for approximate HP, as with any build, that depends on a helluva lot of variables. I say approximately 137.357573183097134578hp, but that's just me.

Pat
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Old 02-29-2008, 09:53 AM   #20
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Quote:
Originally Posted by Patrick Olsen View Post
... Of course, you can be crazy like me and do lighter rods and piston pins, too (but I'll still be using the stock Phase II N/A crank).
so what CR are you running ? whats your settup consist of ?



Quote:
Originally Posted by Patrick Olsen View Post
...


Too bad you couldn't search for info on the frankenstein build, as it's never EVER been discussed in dozens of threads in this forum and the Built Motor forum and the Subaru Conversions forum.
...
Pat
thats too bad... someone should talk about it more ...........




Last edited by IllNastyImpreza; 02-29-2008 at 09:59 AM.
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Old 02-29-2008, 10:18 AM   #21
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Quote:
Originally Posted by Storm View Post
^^^coughirishmikescough

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Ha ha yup. Its just sitting under a work bench all alone with no one to play with it. I really want to go pick it up. Well see how the money works out with tax retuns.

Josh
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Old 02-29-2008, 10:39 AM   #22
IllNastyImpreza
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Originally Posted by Whiteghost 2.5 View Post
Ha ha yup. Its just sitting under a work bench all alone with no one to play with it. I really want to go pick it up. Well see how the money works out with tax retuns.

Josh
o **** thanks for reminding me... Gona go do mine right now
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Old 02-29-2008, 04:29 PM   #23
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Quote:
Originally Posted by IllNastyImpreza View Post
so what CR are you running ? whats your settup consist of ?
The engine isn't built yet - all the components are in storage waiting for me to complete a change of duty station. CR should be ~10.8:1 once it's all together. Phase I DOHC heads (Cobb ported), Phase II block, OEM Phase II pistons (100mm), Crower rods (quite a bit lighter than stock, can't remember the numbers off the top of my head), TWE piston pins (also quite a bit lighter than stock.

Pat
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