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04-23-2009, 02:38 PM | #1 |
Scooby Newbie
Member#: 189923
Join Date: Sep 2008
Chapter/Region:
W. Canada
Location: Cranbrook, BC
Vehicle:1993 JDM WRX Black |
Early EJ20G heads with 2.5 STI Block?
I was just wondering if this is possible. I have a 93 JDM WRX. I am going with the STI 6MT as well. I wanna use my heads and everything else in the car except swap in a 2.5 block and 6MT for more power handling and reliability.
I will most likely be going standalone down the road.
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04-23-2009, 04:03 PM | #2 |
Scooby Guru
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RMIC
Location: Teh Ghetto Garage, CO
Vehicle:99 2.5RS, '85 911 '73 914 and 2012 BRZ |
Yep. It's been done a bunch of times. It's a bolt on affair. The only additional challenge is the extra crankcase breather and the coolant crossover pipe. But it's not a major issue.
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04-23-2009, 11:27 PM | #3 |
Scooby Newbie
Member#: 189923
Join Date: Sep 2008
Chapter/Region:
W. Canada
Location: Cranbrook, BC
Vehicle:1993 JDM WRX Black |
So basically a good catch can setup and a modified pipe. Hmm well I'll start looking. A stock short block seems fairly inexpensive. The tranny will be the biggest cost. At least with the sti block the 6MT will bolt up with all 8 bolts not 4 lol.
So the oil and coolant journals are the same between the 2.5 block and the older phase 1 ej20g's? |
04-24-2009, 01:24 AM | #4 |
Scooby Specialist
Member#: 56345
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Location: CO
Vehicle:1997 OBS Primer Grey |
Yeah.
Beware if those are the rocker EJ20G heads, lifter suck and they make no power up top. |
04-24-2009, 04:45 AM | #5 |
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In the first post it says 93 JDM WRX so it won't have the rocker heads.
Be aware that compression ratio will be as follows: 9.2:1 with 0.58mm original EJ257 gasket 11044AA641 (holes for intake manifold won't line up) 8.9:1 with 1.00mm Cometic gasket 8.6:1 with 1.37mm original EJ25D gasket 11044AA610 |
04-24-2009, 10:41 AM | #6 |
Scooby Newbie
Member#: 189923
Join Date: Sep 2008
Chapter/Region:
W. Canada
Location: Cranbrook, BC
Vehicle:1993 JDM WRX Black |
So the EJ257 from the USDM STI isn't gonna work with my intake mani?
EJ25D what car has this motor and how much power is it able to hand roughly? |
04-24-2009, 10:54 AM | #7 |
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RMIC
Location: Teh Ghetto Garage, CO
Vehicle:99 2.5RS, '85 911 '73 914 and 2012 BRZ |
That's not what he's saying. The Ej257 will work, but you just want to use the Ej25D (dohc NA engine from 1996-1999) gasket. It's a phase I gasket and is thicker, which is what you want since you are using phase I heads. It's both the right compression ratio and the right manifold spacing. You just need the gasket, not the block.
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04-24-2009, 11:55 AM | #8 |
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Haha oops ya that makes sense. Thanks for the help. I'll start sourcing parts for this. One other question though. Do you think the factory ECU will be happy with the extra displacement? I would imagine so. It would only be temporary till I got a standalone.
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04-24-2009, 05:39 PM | #9 | |
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Quote:
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04-24-2009, 06:47 PM | #10 |
Scooby Guru
Member#: 832
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Vehicle:99 2.5RS, '85 911 '73 914 and 2012 BRZ |
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04-24-2009, 07:06 PM | #11 | |
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NWIC
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Vehicle:88 GL-10 STi silver |
Quote:
i spent my money on EM first. now i can do anything i want, and be able to tune for it... -=Suberdave=- |
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04-24-2009, 07:20 PM | #12 |
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+1 for suberdave!
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04-24-2009, 08:34 PM | #13 |
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Vehicle:1993 JDM WRX Black |
That's what I will do. I am just going to start finding what I need for next winter no big rush. For this summer I'll be happy with 250whp+ i suppose lol. Next year I'll build her up when my shop isn't so busy.
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04-25-2009, 01:46 AM | #14 | |
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Quote:
Besides those issues you will also have to use the latest belt tensioner setup with the extra idler when using the thin gaskets to prevent belt slack. With the thicker gaskets you can use your original setup. As for the EM: I agree with Dave, fully. However, you can use the original ECU temporarily but you will have to run waste gate pressure (ca. 0.4-0.5 bar) only to prevent the issues described. |
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04-25-2009, 01:56 AM | #15 |
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Awesome thanks for all your guys help.
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04-27-2009, 01:01 AM | #16 | |
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Quote:
This build I did was for a US 98 Legacy GT, it had an EJ25D in it. We ditched the shortblock for an EJ257, I rebuilt the heads and we used EJ257 OEM STI headgaskets and I 5hit you not, intake manifold installation was smooth. No hogging holes out or drill bit wiggling was required. True story. |
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04-27-2009, 10:08 PM | #17 | |
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Quote:
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04-28-2009, 12:17 AM | #18 |
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Vehicle:98 cam'd EJ251 Wrx Tranny,slowr than ish |
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04-28-2009, 12:17 AM | #19 |
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Below 9:1 on pump gas, on E85 the higher the better IMO.
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05-07-2009, 07:10 PM | #20 |
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Vehicle:1971 Super Beetle EJ20g Platinum Grey |
Marnix which one is the latest? The one piece with one bolt and the whole thing pivots or the two bolt holding the cylinder and seperate pivoting pulley? Is this a straight forward bolt on affair to switch between both? I've had both apart but can't remember.
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05-07-2009, 10:37 PM | #21 |
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One bolt is the newest and you'd need the mounting bracket as well.
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05-09-2009, 03:40 PM | #22 |
Scooby Newbie
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Join Date: Mar 2007
Chapter/Region:
W. Canada
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Vehicle:1971 Super Beetle EJ20g Platinum Grey |
Well, since it looks like the original poster had his questions answer I'm going to take over, lol. I'm trying to cost out doing this swap and figuring out everything that is needed to make this go smoothly (if anyone does this in the future). If I do go ahead with this swap I'll update with any additional things I run into. Here are two other threads discussion this: STI Block EJ20G heads? and Ej20g + Ej257 = ?
My car has 550cc injectors, TD05-16g and using Apexi PFC for tune. I'm looking for around 350 hp atc. I imagine I'll be upgraded the MAF to a Z32 or Q45. If anyone can add to this list with numbers and any other parts needed I will update it with your posts to help make this an easy conversion for those in the future. New parts needed -Ej257 short block - 10103AB440 -Ej257 oil pump - 15010AA280 -Ej257 water pump - 21111AA240 -EJ257 timing belt - 13028AA240 if switching to new style tensioner -EJ257 tensioner, mounting plate and extra idler - I've also read that you can use the old style tensioner but not sure which belt you'd use then? -Head gasket - if early legacy heads use EJ257 - 11044AA641 if wrx heads use EJ25D - 11044AA610 -Head bolts -Gasket kit - not sure whats all included - intake mani, exh,? Also I would change (part numbers needed, not sure in differences between wrx and legacy heads here) -EJ20g cam seals - 806732150 -Ej20g Valve Cover seals - are these needed or can they be cleaned and work like new? Last edited by Eatoniashoprat; 05-10-2009 at 09:11 AM. |
05-09-2009, 05:55 PM | #23 |
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Sorry to hijack but since were on the discussion of headgaskets to use with different block/heads. I am doing an ej25d block with ej18 heads from my 93 L. I was told that it will be a bolt on affair also. But I am curious as to what headgaskets to use? I think ej257 gaskets would be best. But I also want to raise the compression as this will be an all motor build. Cometic? Help me please.
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05-09-2009, 07:12 PM | #24 | |
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Vehicle:1971 Super Beetle EJ20g Platinum Grey |
Quote:
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05-09-2009, 08:32 PM | #25 |
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Very true man, thanks. Good luck with your build.
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