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Old 10-01-2012, 11:11 PM   #1
SubaruImpreza_power
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Question Ej25d

I'm debating next year or so to plan a turbo build but I have a few questions.. One regarding engine management and emissions.

Would greddy's emanage ultimate be good? Here in CT they only do a sniffer test so I'm a little concerned I would fail.

I plan to run pretty much no more then 5 psi So that should put me at what around 190-200 CHP?
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Old 10-01-2012, 11:38 PM   #2
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Lower the compression ratio with 255/257 head gaskets and go for gold on the boost. If the tune is done right then I don't see why emissions would be an issue.
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Old 10-02-2012, 08:00 PM   #3
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Hmm first I heard of changing the gaskets on it.
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Old 10-03-2012, 05:44 PM   #4
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You can't use 255/257 gaskets on your engine. Using a thinner head gasket will cause your valves to hit your pistons since the ej25d pistons come up just past the deck of the block at tdc. You will be fine running 5psi. We have a 9.7:1 compression ratio in the ej25d which makes it more(just barely) suitable for boost then the sohc ej engines which are 10:1. What does your build look like, are you going the custom up/down pipe route or are you swapping the cross-member so that you can use the oem pipes?
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Old 10-03-2012, 10:07 PM   #5
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Yeah I think I remember back long ago about those headgaskets and the EJ25D, back when I did my HG's I did rotate one of the pistons to TDC and I saw how it would hit the block if I used the 255/257 gaskets.

having said that I was thinking maybe the subachad uppipe to some UEL headers, as far as the downpipe I would be curious since it seems very few come with cats in them? The downpipe would be replacing the first cat and the cat would be integrated into the DP right?

*edit seems it does

Last edited by SubaruImpreza_power; 10-03-2012 at 10:21 PM.
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Old 10-04-2012, 10:09 AM   #6
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I am running the subachad pipes, they are expensive but they make things so much easier. If you go that route make sure you get the downpipe extended by 4", the pipes were designed for the impreza and makes contact with the legacy's subframe if you don't.

IF you really wanted a cat in your downpipe a muffler shop could easily weld one in for you. You will need to have a small portion of the exhaust system made up to connect the downpipe to the mid-pipe and could always put the cat there.
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Old 10-04-2012, 12:39 PM   #7
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Hmm I did not know that part about the subachad.. maybe I will just do the one where I replace the crossmember or cut the part out, however cutting the part out how big is the cut? Do most downpipes come with cats? I never looked at a Stock Subaru pipe do they just run one? We have emissions here so..
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Old 10-04-2012, 01:20 PM   #8
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I believe the oem downpipes come with cats,some up-pipes aswell. Notching the crossmember can open up a whole new can of worms, here's a diy link http://www.rs25.com/forums/f105/t131...ss-member.html If you choose to run the oem equipment, looking into just swapping to an older turbo legacy cross-member as it a direct bolt on and will allow you to run the oem turbo header/up-pipe and down-pipe.
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Old 10-04-2012, 02:42 PM   #9
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I'm looking on carpart.com would they call the front cross member a engine cradle? I assume that's the crossmember Funny they have a listing for the transmission crossmember.
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Old 10-06-2012, 01:00 PM   #10
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yep found some but the going rate seems to be around $200-250
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Old 10-11-2012, 01:53 AM   #11
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Dooood you don't have a good shop around you? I WISH i only have a sniffer test !
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Old 10-11-2012, 10:54 PM   #12
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First off the 255/257 headgaskets are thinner than the stock ones so they would raise the compression.

Second if you want the subachad pipes then you would need both the up and down pipes and a shop to make you the cat section to bolt to the midpipe.
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