Ej257 swap advice ### - Subaru WRX Forum
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post #1 of 20 Old 11-13-2011, 04:57 PM Thread Starter
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Ej257 swap advice ###

#4 cylinder is almost gone in my 02 wrx. Looking at my options and the ej257 block swap has really caught my attention. What modifications need done for a reliable swap? If you can list out the mods required that would be a big help.
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post #2 of 20 Old 11-13-2011, 04:59 PM
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Meaning you're just going to swap in a 2.5 bottom end?

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post #3 of 20 Old 11-13-2011, 08:45 PM
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Other wise its going to be a lot more of a headache to swap in a long block EJ257 is what Chase is getting at.

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post #4 of 20 Old 11-13-2011, 09:28 PM Thread Starter
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Just want to swap the bottom end. From what I've read I use all STI parts on the block and then bolt on the ej205 heads.
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post #5 of 20 Old 11-13-2011, 10:38 PM
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You will need a custom tune to get the car rolling after you get the block back in the car.

Joshua
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post #6 of 20 Old 11-13-2011, 10:50 PM
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Pretty simple man. Heads bolt right up. Have fun.

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post #7 of 20 Old 11-13-2011, 11:38 PM
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If you're doing a hybrid you need injectors as well. And be aware that this is not a long term setup as these mixes are highly knock prone.
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post #8 of 20 Old 11-14-2011, 12:11 AM
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Yep, they bolt right up but due to the different bore size the 2.0 heads are made for, more knock prone. There sre companies (equilibrium comes to mind) that will match the combustion chamber to the larger bore of the new block.

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post #9 of 20 Old 11-14-2011, 05:52 AM Thread Starter
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What's the easiest way to go for tuning? Cobb Accessport?
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post #10 of 20 Old 11-14-2011, 06:10 AM Thread Starter
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When you guys mention knock, are you talking detonation or rod knock? The detonation issue would probably be from higher compression and boost levels. From what I've read the CR will be around 8.7. This would limit boost to around 17-18psi safely on 93 octane. Reliability should come from the tune itself though.
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post #11 of 20 Old 11-14-2011, 07:02 AM Thread Starter
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Quote:
Originally Posted by brfatal View Post
If you're doing a hybrid you need injectors as well. And be aware that this is not a long term setup as these mixes are highly knock prone.
Why would I need new injectors? I'll still be on stock turbo. No power increase other than the increased low end tq from the 2.5L bottom end.
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post #12 of 20 Old 11-14-2011, 07:28 AM
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Quote:
Originally Posted by 02RexWgn View Post
What's the easiest way to go for tuning? Cobb Accessport?
Ask your tuner.

Quote:
Originally Posted by 02RexWgn View Post
When you guys mention knock, are you talking detonation or rod knock? The detonation issue would probably be from higher compression and boost levels. From what I've read the CR will be around 8.7. This would limit boost to around 17-18psi safely on 93 octane. Reliability should come from the tune itself though.
CR is ~9:1. And detonation is more common on these engines due to the mismatched combustion chambers causing areas of higher heat than they would with matched heads. It's a physical problem, not a tuning one. And boost is not limited to what you're thinking with a stock turbo.

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Why would I need new injectors? I'll still be on stock turbo. No power increase other than the increased low end tq from the 2.5L bottom end.
A typical stage 2 setup already maxes out the stock injectors. With the 2.5L setup you're going to be needing slightly more fuel.
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post #13 of 20 Old 11-14-2011, 11:00 AM
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Cr is going to depend on what you make it by choosing a thicker/ thinner head gasket. When I bolt my hybrid, I was told to go .051 or better.

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post #14 of 20 Old 11-14-2011, 11:43 AM Thread Starter
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Thanks guys. I've made up my mind on what I'll be doing.
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post #15 of 20 Old 11-14-2011, 02:13 PM
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Hey, I just realized you don't live too far away from me. Who are you going to as far as a tuner?

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