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-   -   Ej257 swap advice ### (http://www.wrxtuners.com/forums/f103/ej257-swap-advice-31609/)

02RexWgn 11-13-2011 04:57 PM

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.

Chase 11-13-2011 04:59 PM

Meaning you're just going to swap in a 2.5 bottom end?

turmic 11-13-2011 08:45 PM

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.

02RexWgn 11-13-2011 09:28 PM

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.

newtothegame 11-13-2011 10:38 PM

You will need a custom tune to get the car rolling after you get the block back in the car.

Chase 11-13-2011 10:50 PM

Pretty simple man. Heads bolt right up. Have fun.

brfatal 11-13-2011 11:38 PM

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.

RcrsWetDream 11-14-2011 12:11 AM

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.

02RexWgn 11-14-2011 05:52 AM

What's the easiest way to go for tuning? Cobb Accessport?

02RexWgn 11-14-2011 06:10 AM

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.

02RexWgn 11-14-2011 07:02 AM

[quote=brfatal;271104]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.[/quote]

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.

brfatal 11-14-2011 07:28 AM

[quote=02RexWgn;271114]What's the easiest way to go for tuning? Cobb Accessport?[/quote]

Ask your tuner.

[quote=02RexWgn;271117]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.[/quote]

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.

[quote=02RexWgn;271122]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.[/quote]

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.

Chase 11-14-2011 11:00 AM

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.

02RexWgn 11-14-2011 11:43 AM

Thanks guys. I've made up my mind on what I'll be doing.

turmic 11-14-2011 02:13 PM

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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