Remember with the bigger capacity you won't need so much boost to make as much power and will be much torquier for day to day driving.

Basic mods yea go for it. If your eventually going to go silly on it go a EJ207. Keeping the 2 liter capacity will make for no headaches from the DPI.

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Stoner & Webber 2011 World Champions

im running an ra box an 4.44 diff so i think should be strong enough, i would like to make 350-400whp with reliability dont wanna go silly. im usin standard ecu with a verso so id imagine it can be tuned for a bigger block?

what sort of boost could i run?

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dreamin.

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MY93 Impreza GX 1.8L, 0hp, 0nm

Choose either 350+ HP or reliability, you can't have both unfortunately.

Why the 400 HP figure? It's a pointless amount of power if it's only a road car. Different story if you're going to be on the track a lot.

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TD06 - Oink.

My thoughts to.

Check my mods list in the driveway for about 280 hp atw ( Probably just crack 300 when Lane has time to tune it )

The EJ25 I think is the 9.something compression ration to so you will be limited a bit on the boost you can run safely more than a EJ257 or a EJ207.

Don't expect 350-400 HP atw to come cheaply.

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Stoner & Webber 2011 World Champions

we all gotta do it sometimes

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just had a look at your mods, think im gonna have to decide for sure exactly what i want, i really need it to be reliable.

hey i have also just been reading this, i was fairly suprised.. its a dyno comparison between an ej255 an a ej257

http://forums.nasioc.com/forums/show....php?t=1336725

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stock standard, an ej255 will never make the same power reliably as a ej205 or a ej207. You will though, have a much more drivable car. Especially with a vf34 you will struggle just to keep it OFF boost.

expect about 230 kw atw reliably. and 250 kw if you can get a 257.

Boost wise. I'd say 17 PSi for the 255 19 for a 257.

Chuck 20 grand into it though and 300 is the limit before you start breaking things on a weekly basis.

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Twin scroll Pig Bi-Squeeling

Boost wise, there is no difference....because the bottom ends of an EJ255 and EJ257 are identical.

i was reading somewhere that some ej255's use the earlier ej257 blocks so i will see if they do. this is what i read.

(As most of you know, the term EJ255 and EJ257 come from the first part of the ‘Engine Code’ assigned by Subaru. Unfortunately Subaru used the EJ255 code for two different configurations that overlapped in production. This use was in part driven by the assembly of the Legacy in the US plant ( SIA ) while the Impreza line was built in Japan. In the end, there are two different EJ255 motors. For clarity sake, I will call them version 1 and version 2. Note that this use of the term version is my own, not something that Subaru has used.

EJ255 Version 1:
Used in the 2005 and 2006 Legacy, as well as the 2004 and 2005 Forester. This engine uses the AB440 shortblock, which is the same shortblock as the 2004-2006 STI EJ257. The heads on these EJ255 are the AB650s, while the US 04-06 STI is the familiar AB640/910. The cams are the same between the EJ255 Version 1 and the EJ257.

EJ255 Version 2:
Used in the 2006-2008 WRX, the 2007+ Legacy, and the 2006+ Forester. This is the newer AIS equipped EJ255, which uses a slightly different AB630 shortblock, as well as the AB820 heads. The only difference in the shortblock of this EJ255 and the 04-06 EJ257 is the pistons. They are of nearly the same construction, but have a slightly larger dish volume. As for the heads, the AB630 heads have a smaller combustion chamber, but I do not yet know the exact specs. I suspect it is around 50ccs based on the engine config spreadsheet listed below. Subaru lists the CR at 8.4:1 vs 8.2:1 for the 04-06 STI engine.)

or am i wasting my time?

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