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Old 09-06-2008, 01:01 PM   #1
96LegacySwap
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Default Need Info/and Imput...ej20v3/96 Legacy Sadan

I have a 96 legacy L sadan,with a standard trans. I will be picking up my sti JDM ej20 version 3 motor next week from a shop. I plan on getting the sti 5 speed trans, and and rear diff w/axles. My goal for now is when i get the motor it will be teared down and inspected. NEW bearings, pistons, gaskets, APR head studs, 5 angle valve-job. Clean up on the ports. I need a run down on some of ur opinions on parts/clearances/oil pump shimming, etc. I would like to stick with the stock turbo for now and up the boost a bit. How much hp can these stock inj see? I plan on doing a side feed inj system/fuel reg. I've built many boosted honda motors, my current is a 94 prelude. H22 stroked, aebs sleeves, fully built, AEM EMS stand alone, putting down 543hp to the wheels. I've been around the block with these caliber engines. I need a jump start with scooby imput. It took many yrs and money to get that honda at those numbers...3 engines to be exact. Due to machinist and different tuners. But over the years I've found the right people to take care of the things i cant do... tuning and machine work. I just had my second daughter and dont have the time like i use to..I'm building this car to be a fun family car...meaning the interior is staying intact and looking to get a reliable 350 hp. So far i got the 16x8 slipstreams 48 offset w/falcon 615 tires. Kevlar, fiberglass NRG seats, Megan street coilovers..which im very impressed with. I run tein flex on my honda and have to say the quality and ride is the same.

Oh ya i really need help with the wiring lol..havent got there yet but would like to be ready for it. There is a shop close to me in springfeild ma that is providing me with all the parts, and he said pretty much the harness is getting spliced into the dash harness. On a personal level i asked him how long it takes to do it out on the table. He said he can do it in a day out of the car. He said 950 bucks to do it...this is not a option for me, it has to be done by me and my tuner. ///PLS help/// It would be greatly appreciated.

BEN

Check out the pics on the linked website. http://albums.phanfare.com/isolated/...941826/2683524

When things start moving along, I am thinking about starting a build thread on this car. If anybody is into stand up freestyle jet skiing, you can check out my pro back-flip build on this link: http://www.x-h2o.com/showthread.php?...highlight=24-7.
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Old 09-06-2008, 03:15 PM   #2
Jaxx
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you sure you want to tear down the engine .. finding the right gaskets can be difficult
you will also need a turbo cross member

there is NO way you can get that kind of power out of a ej20k
breaking 350 whp will be very difficult
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Old 09-07-2008, 10:53 PM   #3
davis10
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Quote:
Originally Posted by Jaxx View Post
you sure you want to tear down the engine .. finding the right gaskets can be difficult
you will also need a turbo cross member

there is NO way you can get that kind of power out of a ej20k
breaking 350 whp will be very difficult
a V3 Sti is capable of everything a USDM wrx motor is plus some. With a big turbo, injectors, exhaust, and power FC or Link ECU I think you should be able to get 350whp. reliability is questionable, ej20k's have kind of a bad reputation. I'd run 15W50 oil and make sure its tuned for our pump gas, AKA get a powerFC or a different stand alone. Worst case scenario get a ej257 shortblock and enjoy more displacement.

Last edited by davis10; 09-07-2008 at 11:00 PM.
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Old 09-06-2008, 05:28 PM   #4
96LegacySwap
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Cross member is being cut and welded. I assume just for the downpipe. I don't understand how it will be difficult to get 60 more hp from this motor? I can see with using that stock turbo, but I was talking 350 maybe by next year with a different turbo. Please clarify how this will be difficult. I am assuming you mean with just a stock turbo?
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Old 09-06-2008, 06:10 PM   #5
Jaxx
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well your looking at ~215-220 whp stock
will get you to 300whp with injectors+dp+em (maybe 315-320 w/ e85 and 850cc injectors)
that extra 50 whp is gonna cost you allot
but then a 5 speed won't tak over 300 whp anyway

if you want over 300 whp start with a 2.5

the other hindrance for the ej20k is the lack of EM options for the ej20k
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Old 09-06-2008, 06:12 PM   #6
Matt Monson
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Jaxx,
Maybe I read it wrong but it sounded to me like he wants 350chp which is totally reasonable. That's "only" 70chp over stock...
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Old 09-07-2008, 11:40 AM   #7
96LegacySwap
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Finding parts for this motor are going to be hard? I know the pistons are diff by looking
at the ring setup..but i was going to go with a US version cp/wisceco piston and ring set up.Then i figured the lower end/rod bearings are the same as the US ej20,as well as the head gasket and seals..?Am i wrong,COSWORTH must have parts or another company if these are not the same interchange parts as the usdm motor.Or should i get my money back and save up for the ej25 sti motor. Are the jdm and usdm ej25 motors interchangeable? I figured the ej20 wouldnt be a problem.I need to know what is the best way to do this...the only reason i went this route is because it is a better price to start from. But need to know soon if i want to get my cash back,and go with a diff powerplant.
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Old 09-07-2008, 01:02 PM   #8
96LegacySwap
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Can anyone give me a rundown on what parts are interchangeable. HeadGaskets,bearings,valvecover gaskes,timeing belts,tensioners,valves,springs and retainers...Its hard to find a solid answer.Thanks
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Old 09-07-2008, 04:57 PM   #9
Jaxx
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Quote:
Originally Posted by 96LegacySwap View Post
Can anyone give me a rundown on what parts are interchangeable.
HeadGaskets, no
bearings,yes
valvecover gaskes, no
timeing belts, yes
tensioners yes
valves probbaly not
springs probblay not
and retainers probbaly not
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Old 09-07-2008, 06:26 PM   #10
Matt Monson
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Let's rewind for a minute. What leads you to believe you need to tear this motor down in the first place?

How much are you paying for it?

Also please answer my previous point about how much power you really want. It's really hard to help you when you don't answer our inquiries and jump all over the place with a bazillion questions while giving us next to zero feed back. Help us help you here.
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Old 09-07-2008, 08:19 PM   #11
96LegacySwap
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I am paying $2200 for the motor. It is one of those 30,000 est mile deals, but you can never be sure.

I have two infants and I don't have time to put the motor in the car and then find out it has issues, when I can take it apart to begin with and solve all problems before it happens. It is just what has to be done.

I plan on running the motor with a stock turbo this year. My overall goal by next year is to get 350 whp. So what I wanted to do was build the motor right from the inside out, have it be reliable, and then install a bigger turbo, manifold, injectors, etc. by next year and boost it up.

So I was just trying to get a list of the parts that will be interchangable and get a lowdown on the motor so I am ready for it within the next two weeks. You all have done this before and I haven't so you are the ones to ask.

I also need to know about the wiring conversion I need to perform. If anyone has any diagrams or info that would help me out that would be great. That way I don't have to pay someone else to do it for me when I could do it myself.
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Old 09-07-2008, 11:05 PM   #12
Matt Monson
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Ben,
Save yourself some money and take that engine back. Then go to here:
http://www.gruppe-s.com/Subaru/UsedEngines.htm

Buy one of the $2000 hybrid engines at the bottom of the page. Then go to our classifieds or ebay or your local dismantler and find a USDM wiring harness and ECU. Get the turbo crossmember while you are at it. For $100-150 it's worth it over the cutout method.

You will not need to rebuild that hybrid motor. It will be upgradeable. The USDM ECU will be fully tunable. The JDM V3 ECU is not flashable. It won't get you anywhere near where you want to go without spending another $1000 on a standalone. If you are going to spend $1000, spend it on a USDM ECU and a Cobb Accessport with Streetuner. You'll get modern locally supported electronics. That engine will also be rebuildable with all local modern gaskets and seals and bearings when the time comes. However, for several years, you won't even need to think about rebuilding that block. Install it and drive it like you stole it.

What I have suggested will probably save you money in the long term and get you more power. If you don't save money, it will be a wash when you don't spend $1000 on stuff to rebuild it.
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Old 09-08-2008, 11:02 AM   #13
96LegacySwap
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alright,i thought it over and sticking with the usdm is the way to go. Now how about the trans. The jdm ones are the way to go right. I can get my hands on a jdm sti 5 speed and a rear lsd diff w/ axles. The guy at the shop says 1500 bucks for the sti 5 speed..i didnt get a price on the rear diff assembly. He also has a jdm wrx trans as well for 900 bucks. Which way should i go. And is there a certain gearing i should try to get?
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Old 09-08-2008, 02:45 PM   #14
Jaxx
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get the tranny code and put it into google

1500 for a REAL sti tranny +diff+axels is a decent deal
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Old 09-08-2008, 07:08 PM   #15
96LegacySwap
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1500 for the trans only, like i said i didnt get the price on the sti lsd diff from him yet.What is the price range on the jdm sti rear diff w/ axles.. so i can compare prices.
I found a 03 wrx complete motor with 73k for 600 bucks. Im going to pick it up after work this week.He said it was compression tested and leak downed and its all good. He bought a sti motor and doesnt need this one anymore. Once i get it ill tear it down give it a overhaul with h beam rods and cp pistons. 5 angle the valves, turbo upgrade w/ equal length manifold. 3 IN exhaust no cats..made by me, with a ecu flash and tune. Ill throw some ARP head studs in while im at it. In the future ill look into cams.Im looking at the perrin side feed fuel rail kit, is that the way to go..seems cheep enough?
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Old 09-08-2008, 08:24 PM   #16
Matt Monson
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There's about a dozen variants of JDM STI and WRX trannies. Get me the tranny codes off of both of them. I'll tell you exactly what you are looking at.

Sounds like I am selling my trannies too cheap. I recently sold a V2 STI tranny that had been rebuilt for $1500. No axles or LSD. Just the tranny.
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Old 09-09-2008, 04:53 PM   #17
96LegacySwap
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Well the wrx motor i went and looked at was no good.But i found a 06 wrx longblock 58k 2.5 liter turbo on ebay. Local pickup only...30 min from my house. 1700 bucks,so i bought it.
I called the dealer to conferm but i didnt realize the wrx came in 2.5. I thought they just came in 2.0 and the sti was 2.5. I guess u learn somthin new everyday.Hopefully that was a good buy?
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Old 09-09-2008, 11:14 PM   #18
Matt Monson
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Yep. That's a good buy. I've got a broken WRX in my shop right now that's in need of a longblock. If I had one of those close to me, I'd buy it in a second at that price.
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Old 09-10-2008, 08:38 PM   #19
96LegacySwap
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Picking it up mon night can't wait.He says it has the motor harness only.What do i need to do at this point? Meaning other than a fuel pump do i haveto but the rest of the harness then splice into mine?Or can i do it from the harness he is givin me.
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Old 09-10-2008, 09:00 PM   #20
Matt Monson
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'73 914 and 2012 BRZ

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Nope. You still need a complete harness and ECU. Nothing has changed other than which engine you want to put in your car.
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Old 09-10-2008, 09:16 PM   #21
96LegacySwap
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Just out of curiosity, I found an ecu on ebay that was a 04-05. Will it work with the 06 motor? I plan on having it reflashed, just wanted to know if it would work so I can buy it. I am looking for an ecu right now.
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Old 09-11-2008, 10:41 AM   #22
Matt Monson
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It will work but you will want to source an 04-05 intake manifold harness to use with the ECU.

I never remember if the '06 WRX got the immobilizer or not. Someone might pop in and clear that up.

But basically, you can use an USDM WRX ECU and wiring harness from 02-05 and then reflash it with a tune. The key is that you must get the complete harness including the manifold harness. You also need to source a fuel pump harness and controller as well.

In general, it's most cost effective to buy everyting as a complete swap but it's been done piecemeal if you are patient and shop smart. Worst case, you buy a complete 02-03 WRX swap with longblock and then use the Ej25 with it and sell off the Ej20.
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Old 09-11-2008, 05:18 PM   #23
Jaxx
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06 wrx ->2.5 ->imobilizer
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Old 09-11-2008, 05:53 PM   #24
96LegacySwap
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He told me the complete engine harness is there,i would just need from the firewall back now.. right.
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Old 09-11-2008, 06:16 PM   #25
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Can u get rid of the immobilizer when u go with a earlier yr ecu with a reflash? Sorry im a nube when it comes to this crap iv never had to deal with. So any wrx ecu will work 2.0/2.5/sti 2002 up when being reflashed.Is one better than the other? Pls let me know im at this stage now were i need to buy a ecu...DOES ANYONE HAVE ANYTHING, ecu, or the rest of the harness i need , fuel pump. Thanks for the help so far, Ben
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