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Audi Fondler
2000 Silverish 2.5rs Sedan
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Discussion Starter #1
Hiya all... kind of a big question for me at least. What's the difference the engines you can replace the stock on with fairly easily. EJ25 etc, hp differences, mod differences.... please post any info that you have... I'm very confused atm hehe.
 

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About the only easy (and legal) swap that will give you more power will be for the 02 EJ20T.
 
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I think I speak for everyone when I say, Huh?

Please clarify what it is exaclty that you're asking.
 

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Audi Fondler
2000 Silverish 2.5rs Sedan
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Discussion Starter #4
Just wondering differences in the engines available that fits in the rs housing. I don't know entirely what to ask and that's why I'm asking for any info :) I'm not necessarily planning to do it but was curious :)
 

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overdeveloped beater
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Still not making a lot of sense. If you want to know what engines will fit in the Impreza, most any Subaru will.

If you want to know what you can do to increase HP from a 2.5, you can start with old skool tricks and methodology. Get more air in and let it out as easily as you can. Creating a bigger bang will help bring the HP up. Make the motor run more efficiently and the power will increase.
 

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Audi Fondler
2000 Silverish 2.5rs Sedan
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Discussion Starter #6
Hehe... I know a fair amount about the stock engine... I've just heard people talking about putting different engines such as the ej20 or ej 25.... I just can't find specs on them anywhere.
 

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I think Subaru is currently making 3 different sized engines... I believe.. the 2.0, 2.5, and the H6. imprezas. The 2.0 is in the WRX. The 2.5 is in the RS, Legacy, Forester, and Outback. The H6 is only offered in the Outback. The L model imprezas came in the 1.8 and 2.2. They stopped making the L models in 2001. I think some years they only made the 1.8, and not the 2.2, for the L models.

I've only had a Subaru for a year and a half, so I could be wrong on some of this stuff. I'm sure someone will correct me. :)
 

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Oh.. ej20, and ej25.. are the engine codes for the 2.0L and the 2.5L. So, if you have a 98-01 RS, you have the 2.5L (ej25) engine.
 

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Audi Fondler
2000 Silverish 2.5rs Sedan
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Discussion Starter #9
Ahhh... thanks... that's really what I was wondering ;) Does someone else besides subaru make them though? I thought I saw a website selling ej25s etc... maybe just replacement engines but I just didn't know :)
 

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I think Subaru is currently making 3 different sized engines
just to clarify, this is only SOA (subaru of america). in other countries they have different engines. for example, in Israel they have a 1.6 in the current impreza (see my thread in OT for more details).

as far as swaps go, the big on is sourcing a J-spec EJ20 out of a wrecked STi and swapping it and its computer etc. good luck finding pump gas to run in it though.
 

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10th Warrior said:


just to clarify, this is only SOA (subaru of america). in other countries they have different engines. for example, in Israel they have a 1.6 in the current impreza (see my thread in OT for more details).

as far as swaps go, the big on is sourcing a J-spec EJ20 out of a wrecked STi and swapping it and its computer etc. good luck finding pump gas to run in it though.
I meant in the US or SOA.. Som etimes Imay mumbl eand ru nmy wor dstoget her, andfor getto sayso mething. Than ksfork eep ingme in chizeck. :D
 

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to answer your question on private parties making engines check out cobbtuning.com
they offer somewhat custom blocks and heads
some offer redline increases up to 8,500rpm with stability
worth a look if u've got 5k floating around
 

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DragonRM said:
Just wondering differences in the engines available that fits in the rs housing. I don't know entirely what to ask and that's why I'm asking for any info :) I'm not necessarily planning to do it but was curious :)
Housing???? Huh? Do you want to swap out internals (rods and pistons)?
 

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Audi Fondler
2000 Silverish 2.5rs Sedan
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Discussion Starter #16
Hehe... this post was somewhat old but I was looking into swapping the ej25 for a ej20 turbo etc... I'm probably just gonna wait and SC my current one...
 

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quote froom Matrix Engineering: if you turbo or s/c the ej25 definately swap your heads or at least the valve springs for anything over 8psi. not only that but, do your gaskets as well.

I did ask why and they told me that because of the compression ratio being 11:1 you WILL blow your gaskets if not ruin the engine all together. the only other alternative being to swap the pistons to get around a 8.5:1 up to 9.5:1 ratio and then add boost.
as far ar the heads go; the stock parts in the heads were designed solely for gas mileage (meaning weak and light) and with more power and higher revs you will experience an overwhelming case of valve float.

good luck with your project!!


http://www.matrixengineering.cc
 

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Audi Fondler
2000 Silverish 2.5rs Sedan
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Discussion Starter #18
yeah... I'm probably looking at the sc that templar is working on... I think he's planning on the stage 1 maxing at 6 psi... it's being designed to work with stock. :D
 

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as far as swaps go, the big on is sourcing a J-spec EJ20 out of a wrecked STi and swapping it and its computer etc. good luck finding pump gas to run in it though.
Why wouldn't 93 be enough? Japanese spec calls for 100 RON minimum. UK spec, most likely what we will see, calls for 95 RON minimum... Our 93 (RON+MON/2) = 98 RON.
 

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zoinkssooby said:
quote froom Matrix Engineering: if you turbo or s/c the ej25 definately swap your heads or at least the valve springs for anything over 8psi. not only that but, do your gaskets as well.

I did ask why and they told me that because of the compression ratio being 11:1 you WILL blow your gaskets if not ruin the engine all together. the only other alternative being to swap the pistons to get around a 8.5:1 up to 9.5:1 ratio and then add boost.
as far ar the heads go; the stock parts in the heads were designed solely for gas mileage (meaning weak and light) and with more power and higher revs you will experience an overwhelming case of valve float.

good luck with your project!!


http://www.matrixengineering.cc
Here's a dumb question.... I plan on running Templar's SC kit too... even though he's designing it with stock in mind... I wonder about the wear and tear on gaskets even at 6psi. My car is fairly new, I'd rather take preventive action than repair the thing.
 
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