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Old 09-20-2010, 01:23 PM   #1
Bishj275
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Default 2005 Forester pistons?

Anyone know where i can find a set of pistons for NA build to be ran on pump gas, looking for a compression bump but all i can find through my searching is lowered ratios for turbo engines. As stated in the title, this is for a 2005 Forester 2.5X. Any recommendations? thanks
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Old 09-20-2010, 03:38 PM   #2
formula91
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Wouldnt any EJ253 piston work?
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Old 09-20-2010, 04:06 PM   #3
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I believe he wants to go to a higher compression than he is already running. But yes, if you can find a set of higher compression EJ253 pistons you would be in good shape.

Good luck with that though, not too many high-compression NA builds going on. Aren't these things like 10.0:1 in stock form? Go much higher and you will need to run race gas.
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Old 09-20-2010, 06:16 PM   #4
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Yea you guys are correct, but i am looking for something a bit more than 10:1 perhaps 11:1, the stock engine is 10:1 and is recomended for 87 octane so i dont see why i couldnt go 11 and run 93, just a thought and i have been doing some research.
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Old 09-20-2010, 06:39 PM   #5
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Your right it's when you go into the 12:1 ratio something of 100-103 is required not race gas. Race gas is 108+ some pumps have VP 100 which will work out just fine. 11:1 is a slight pump but you will need 93 at least and a good tune. Personally don't see the point in bumping it up just to 11:1 go 12:1 and you'll be happy with some cams it'll be a lil beast.
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Old 09-20-2010, 06:40 PM   #6
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Remember subbies pull alot of timing even in N/A form so that will help if u can control that.
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Old 09-20-2010, 06:41 PM   #7
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Old 09-20-2010, 06:55 PM   #8
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About the TWE pistons,

Just be aware that you probably that forged pistons can decrease the DD-ableness of the car.

Going 11:1 or even 12:1 is a large ordeal, so you should be prepared to spend $$$ (on the pistons, they're expensive due to low # of production) and some time tuning the timing amonst other things.

Furthermore, I'm not sure if you can effectively even utilize 11:1 compression without significant head work. I'm sure you can do without it, but seeing as how the N/A engine are severely restricted in airflow due to the heads, is going 11:1 going to help much at all?
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Old 09-20-2010, 07:20 PM   #9
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Weisco pistons. You should give them a call. I have installed weisco's in several build and they have performed flawlessly.
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Old 09-20-2010, 07:27 PM   #10
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TWE has the only off the shelf option available. However, they are Wiseco pistons, and Wiseco will certainly custom make a set for you anyways and at a bit of a savings to what TWE will charge.
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Old 09-21-2010, 07:52 AM   #11
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Kinda glad my nephew is a QA inspector at Wiseco He's on the lookout for 4 "defective" pistons for me, as soon as I tell him what boresize and CR I want.

Jay
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Old 09-21-2010, 10:55 AM   #12
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I hope you don't plan to drive the thing much if you go 11:1 or 12:1... 100+ octane gas ain't cheap.

The stock engine at 10.0:1 pulls timing on 87 octane.

Honestly a set of cams and a 93 octane tune would do you a lot more good than upping the CR.
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Old 09-21-2010, 06:48 PM   #13
Bishj275
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The engine is being ran on a stand alone computer and is going in a boat, dont like to throw that around too much tends to make people think twice before replying, but i am really not looking for large HP numbers on top end, i am looking for more of a low to mid range engine with lots of grunt. I was told that upping the CR is very simular to upping the boost on a turbo engine with the exception of detonation. As far as running this engine alot, i plan to run it practically every weekend at a steady RPM range much higher than in the car. Say cruse at 4000 rpms or so and i plan to have the engine proped out to turn no more than 5600 RPM.
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Old 09-21-2010, 06:53 PM   #14
Bishj275
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Quote:
Originally Posted by flstffxe View Post
Stated on this web Site:
Impreza RS/TS, Legacy, Baja, Forester, SOHC 2.5L
Our asymmetrical crown design mirrors the combustion chamber as closely as possible to maximize the quench area.
  • Compression ratios of 9.0:1 and 11.2:1 (on 91 octane) are available off the shelf. Turbo and N/A
  • Ultra light weight Wiseco forging
  • Quench pads for reduced detonation allowing higher boost and compression ratios
Looks to me like 11.2:1 can be ran on 93 octane so no race fuel needed according to these guys.

Let me know what you all think about these pistons in the applicattion i stated in my last post.
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