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Old 09-09-2003, 09:15 AM   #1
Teh Legacy
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Default Best head swap for EJ22T Ver I?

I know the head isnt the best flowing on the EJ22T, so what should I replace it with? I'm building the motor for serious boost. Anything else I need to know about this motor before I start? Thanks.
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Old 09-09-2003, 03:40 PM   #2
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Serious boost? Hmmmm.....anyway, a lot of people will say the 2.5 heads are the only way to go. Personally i think they're on crack. Go and read the write up on the legacy forum about the swap. You'll find out they work, but not exactly how well most people think.
If you could find a wrx motor then you could use those heads and i guess they work pretty well. I'm considering this for my legacy.
Or you could just port the hell out of the current heads and make them flow better. I think this is probably the best choice, but you don't get bragging rights with it though. But then you'll have a hard time finding injectors with the fuel rails to work with serious boost.
The block uses cast pistons which you might want to change out with forged ones. If you use a different head you'll more than likely have to change them anyway to get your compression ratio right.
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Old 09-10-2003, 01:05 AM   #3
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My plan was to use ver7 sti heads.
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Old 09-10-2003, 12:14 PM   #4
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Only problem with the V7 heads is the variable valve timing. You would have to run the stock ecu or find a aftermarket ecu that has the proper software to make them work.

Guys in OZ are using early close deck blocks and V6 heads. Apparently it has better flowing ports and improved combustion chambers. Not sure about the cams though. I still think V3 cams are the best.
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Old 09-10-2003, 12:46 PM   #5
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Ya... I realize what a wiring mess that will be.

From what I know US wrx heads are v6 castings. The problem with using them is the low CR they will give you right?
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Old 09-11-2003, 05:06 PM   #6
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so does any body know what sort of CR you would get with WRX heads on a ej22t using the stock pistons ?, Im thinking about doing this swap too, I will probably get forged pistons and connecting rods too. but the more info the better
oh ya are the WRX heads the ones with variable valve timing ?
thanks
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Old 09-11-2003, 05:32 PM   #7
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Jdm wrx heads have avcs and so does the us sti but the wrx does not... but you would have to run a the ecu for that head which would be the wiring mess I was talking about.

Wrx heads would not be an ideal setup with the small ports and short deration low lift cams. You could get a port job and live with the cams... just dont bother with regrounds or welded cams. Rs heads flow better then wrx heads but I would never pick SOHC over DOHCs

I dont remember but its around here somewhere use the search theres a chart with a bunch of different setups and I know its been talked about just dont remember where.

Last edited by totoherbs; 09-11-2003 at 05:40 PM.
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Old 09-11-2003, 11:09 PM   #8
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thanks , I just went down and talked with my mechanic and he said the WRX heads would not work very well ,so yes you where very right about that, but I was trying to avoid whole variable valve timing thing.
I think I will just get original ej22t heads ported.
overall which do you think will be better, RS heads or ej22t heads
for a stage 4 set up ?
thanks ......4WF
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Old 09-12-2003, 04:16 AM   #9
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Well I dont know how much better the rs SOHC heads flow vs the legacys SOHC. But I wouldnt bother porting the legacys. You would be better off useing wrx heads and porting thoes... Or you could use jdm sti heads and not hook up the avcs. So many choices so little time.
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Old 09-12-2003, 11:58 AM   #10
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Why not use the DOHC RS heads? From what I've heard they are the best of all 2.5 RS heads on a ej22t.
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Old 09-12-2003, 12:08 PM   #11
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where did you pick the motor up at?
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Old 09-12-2003, 12:10 PM   #12
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also does the wrx tranny bolt upto the ej22t block... vice versa... gears insterchangeable?
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Old 09-12-2003, 12:16 PM   #13
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I believe the DOHC head will result in even lower CR compared to the SOHC head on a EJ22T (SOHC head gives 7.7:1)
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Old 09-12-2003, 12:29 PM   #14
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The CR with the SOHC vs. DOHC RS heads is a function of the headgasket. The DOHC HG is a bit thicker and will drop the CR more. It is possible to use DOHC heads with a SOHC hg though to stay at 7.7:1.
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Old 09-12-2003, 03:09 PM   #15
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thanks all ,ya I plan on running a fair amount of boost so a 7.7:1 would be good. as for where im getting the motor my mechanic (he builds rally cars) can pretty well get any jdm or us/cadm motor ,its just a matter of cash. I was told the ej22t will bolt up to my 4eat (2.2L)tranny no prob ,it will have to be beefed up though, black wagon ,it may fit the WRX tranny ,I will ask him for ya
My question for the day is , when people say the engine has been ringed , are they meaning new piston rings or some sort of ring that goes between the block and the head for a stronger seal ?
thanks...4WF
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Old 09-14-2003, 04:50 PM   #16
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anyone know ?
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Old 09-14-2003, 10:25 PM   #17
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Quote:
Originally posted by Compressed
Why not use the DOHC RS heads? From what I've heard they are the best of all 2.5 RS heads on a ej22t.
From what I read on here the RS SOHCs flow better then RS DOHC, and wrx DOHC ...
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Old 09-15-2003, 10:40 AM   #18
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Quote:
Originally posted by totoherbs


From what I read on here the RS SOHCs flow better then RS DOHC, and wrx DOHC ...
That might be true, I'm not sure. I have heard that the DOHC cams flow better, and have a much better top end, that is why I've heard them reccomended.
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Old 09-15-2003, 02:27 PM   #19
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more rpms with DOHC, safely
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Old 09-15-2003, 02:49 PM   #20
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I'm not sure about more RPMs with the DOHC - the design for SOHC head has changed enough that you could roughly go the same RPM with either one, not to mention you can get more lift with the SOHC heads.
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Old 02-17-2004, 06:10 PM   #21
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sooo...i'm thinking about doing the EJ22T block and the EJ25 DOHC heads with some sort of aftermarket cams...probably COBB stg 1 or if I end up running seriously high boost then Stg 3. Any ideas?
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Old 02-17-2004, 06:21 PM   #22
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Yeah, get the 2.5 sti block instead.
Brent
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Old 02-17-2004, 06:55 PM   #23
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Quote:
Originally posted by serious
Yeah, get the 2.5 sti block instead.
Brent
Might save you some money, but the 2.2 is still a better block for high boost. I wouldnt use cobb cams, rewelds are a no-no.
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Old 02-17-2004, 07:47 PM   #24
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how much boost can I run to the 2.5 STi? How much can I pick one up for? What kind of head would I use? I dont want it to be a wiring nightmare, so the STi heads would be a problem. Thanks!
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Old 02-17-2004, 08:03 PM   #25
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Quote:
Originally posted by 97legacygt
how much boost can I run to the 2.5 STi? How much can I pick one up for? What kind of head would I use? I dont want it to be a wiring nightmare, so the STi heads would be a problem. Thanks!
eek... um... lot of questions, most of them have been answered in other threads.

http://forums.nasioc.com/forums/show...hreadid=495863

This thread should get you started on your search....


Questions like how much boost is hard to answer... it depends on whos tuning, what turbo, 1000 other things. They go for $13xx, RS heads will work. There are a lot of threads with the info you are looking for.
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