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Old 05-21-2010, 12:59 PM   #1
honorcode3
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Default Hybrid wrx/ EJ257 short block

I'm thinking about dropping a ej257 short block into my 02 wrx. It is at a subaru dealership right now and I would have them do the work. Here are my questions/concerns. I have the car on a stage 2 cobb accessport map right now. My access port screen has died on me so I can not mess with the maps. I'm pretty sure the AP locks the ecu so could someone tune over this or what would I have to do? Also, what needs to be replaced/changed for the short block swap? I'm trying to do this as cheaply as possible right now/ re-use as many parts as possible (but must be reliable).

Since I would have the work done at subaru, I would then need to get the car towed to another shop that can tune it correct? Please let me know if this can be done easily or a pita.

Thanks everyone!
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Old 05-21-2010, 04:58 PM   #2
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The AP needs to be uninstalled or the car taken to a COBB protuner. --- confirm with COBB Tuning - 801.713.0035

If the injectors are not changed then the car will be a turn key install with the 2.5L just as if a 2.0L was going back in, but tuning would be necessary.

However, since the heads and all other junk is different your compression ratio will be undesirably high, so the use of Cometic gaskets, ARP studs, or forged pistons meant for the hybrid purpose would be favorable.
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Old 05-21-2010, 05:24 PM   #3
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Though your parts from the 2.0 will work, depending on the miles/condition of the car, now would also be a good time to do water pump, oil pump (do an 11mm), timing belt, etc.
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Old 05-21-2010, 05:44 PM   #4
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Awesome replies Outback and sober. So if this is just going to be my daily driver and I want the extra power, but I still need it to be rock solid reliable and start every time I turn the key, what should I change instead of using the old 2.0 parts? Would cometic gaskets, arp studs, and forged pistons together be overkill? water pump, oil pump, and timing belt should all be good. Had everything looked at and timing belt changed about 35k miles ago.
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Old 05-21-2010, 05:49 PM   #5
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What happened to the motor that caused it to need a replacement motor?
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Old 05-21-2010, 06:05 PM   #6
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Forged pistons is getting deep into it - basically a rebuild, (machine work, bearings, etc, etc) - This would be a good idea if you ever plan to build up some power.

To bolt it in and go, just grab some Cometic .060" Gaskets and ARP Studs, Make sure that the STi 11mm pump is in place. If you dont use the Cometics your compression will be undesirably high for a pump gas DD.
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Old 05-21-2010, 06:10 PM   #7
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Yes, I would recommend the Cometics, or even Cosworth makes thicker gaskets. I run the standard thickness, but mine is on e85 and a rally car......hahaha
And to reiterate the previous point, forged pistons are overkill unless there are serious power upgrades planned in the future.
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Old 06-03-2010, 12:45 PM   #8
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Im doing this same swap for my 2002 wrx. I found a decent price on the 2.5L shortblock off flatironstuning.com. If I was going to buy just the shortblock and put my 2.0 wrx heads on it. What would I need for a COMPLETE engine swap ( ecu, harnesses, etc.)? If someone can list ALL the parts needed for this id really appreciate it. I wanna do mainly cosworth, Cosworth gaskets, studs, 99.5mm forged pistons, rods, bearings, I would like to do Cosworth AVCS 272 cams, but i heard Id need the STI ecu for this and the 2.0 heads wont work. Can someone please help me with my troubles, and give me the dos and the donts on this hybrid swap! Thanks
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Old 06-04-2010, 12:58 AM   #9
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Quote:
Originally Posted by jdmyourlife View Post
Im doing this same swap for my 2002 wrx. I found a decent price on the 2.5L shortblock off flatironstuning.com. If I was going to buy just the shortblock and put my 2.0 wrx heads on it. What would I need for a COMPLETE engine swap ( ecu, harnesses, etc.)? If someone can list ALL the parts needed for this id really appreciate it. I wanna do mainly cosworth, Cosworth gaskets, studs, 99.5mm forged pistons, rods, bearings, I would like to do Cosworth AVCS 272 cams, but i heard Id need the STI ecu for this and the 2.0 heads wont work. Can someone please help me with my troubles, and give me the dos and the donts on this hybrid swap! Thanks
Well basically i saw on their site that they offer a hybrid swap kit. It looks like it includes everything you would need to make it work for a pretty good price. If you use the heads, you wont have to worry about wiring at all. One thing i would recommend is getting your heads machined to match the combustion chamber of the new block. You can change the cams out at the same time, but you would have to use cams built specifically for the 2.0 heads. Also, if you are doing a full engine build, why not buy just the case halves? I would call flatironstuning, the are actually local to me and i have done business with them before. They know their s*&t.
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Old 06-13-2010, 11:21 AM   #10
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yeah, i mean it would make more sense to just buy the case halves and build all the internals myself but...the only thing stopping me from doin that is money. I was planning on just buying the 2.5L shortblock with stock internals at first, then about 3-4 months later im gonna pull the whole block out and build it from bottom up. I just dont wanna keep pulling it out every week when i buy a new internal part, so im just gonna buy all the parts over 3-4 months and only have to pull the block out once instead of 10 times. But i checked flatironstuning.com 2.5L shortblocks ( http://flatironstuning.com/p-970-sti...hortblock.aspx ) and it doesnt say anything about the WHOLE hybrid kit, just the shortblock itself without heads. Can you post a link on the whole kit please?
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Old 06-13-2010, 11:31 AM   #11
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Nevermind bro, I found it... Master 2.5L Hybrid Install Kit ... also i gotta another question, if i get my 2.0 wrx heads machined to match the combustion chamber on the 2.5L block, will that lower my compression ratio enough to where I dont have to use thicker headgaskets? or will i still have to use the thick ones.. and cosworth headgaskets or Cometic headgaskets (im a cosworth fan i just wanna get some other subie owners inputs)
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Old 06-14-2010, 11:40 AM   #12
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Quote:
Originally Posted by jdmyourlife View Post
Nevermind bro, I found it... Master 2.5L Hybrid Install Kit ... also i gotta another question, if i get my 2.0 wrx heads machined to match the combustion chamber on the 2.5L block, will that lower my compression ratio enough to where I dont have to use thicker headgaskets? or will i still have to use the thick ones.. and cosworth headgaskets or Cometic headgaskets (im a cosworth fan i just wanna get some other subie owners inputs)
That wont lower your compression ratio. What the machining will do is actually clean up and match the combustion chamber, help fight against detonation and prevent hot spot etc. The headgaskets are the only way to lower the compression back to stock or near stock levels. I havent heard of either gaskets having problems, however with the reputation that cosworth has, i trust the name.

Last edited by s0ber_p; 06-15-2010 at 10:29 AM.
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