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Old 03-18-2004, 11:59 PM   #1
PRODRIVEN
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Default ej20 swap into RS engine mgmt options

If I swap an ej20 (either usdm wrx or jdm) into my RS is there any other way to run it without swapping in the ecu and harness. Can I use a Link Stand Alone and the plug 'n play adapter in to my 2.5 RS ecu. Would the plug 'n play Link engine management be easier to install than wiring a new harness harnesses and ecu? Of course if I went with the link I would have to tune it, where as using an ecu that matched the donor engine would be ready to run. Are there any other adv/or disadvantages?

thanks,
duncan
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Old 03-19-2004, 12:57 AM   #2
totoherbs
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The wrx ecu is the cheepest and easyest way to go.... something like the link is going to means you have to run a harness for it.... and then you still have to find some way to get it tuned.
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Old 03-19-2004, 09:17 AM   #3
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you could always buy a TEC2 or 3, Motec things of that nature. they get a bit pricey and if you dont know much about tuning could be torturous until you are able to get the car to run.

I know i have a TEC 3. It is also a good way to pull alot more power and have more tunability.

billyqua
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Old 03-19-2004, 09:24 AM   #4
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Exactly. Not to mention any standalone system you are going to have to do extensive tuning on and unless you like doing that or have adiquite facilities to do so it's not worth it in my mind. In the long run I think it's also more work. I think the little Japanesse guy who designed the WRX ECM knows what will make the car alot more than Joe Schmo at the local tuning shop. Best thing about running the WRX ECM is that if it's done properly you'll be able to use one of the may reflash or piggy back systems out there to then do more agressive tuning once the car is up and running. My ECM has been ECUTEKed and the car is amazing now. When I did the wiring on mine I made sure to connect everything properly so that the ECM could be reflashed in the car as well as road tuned.

Another reason to shy away from standalone is that depending on how strict emssions regulations in your area are you may never be able to pass them.

Z
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Old 03-19-2004, 09:32 AM   #5
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Z's right. Aside from the engineering benefits of using an OEM ECU, if your state ever institutes emission testing via OBDII scan as some are now, you will be unable to pass with an aftermarket standalone system and there will be no way to "fix" it. At that point you'll have to install the proper ECU anyway to keep the car on the road.
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Old 03-19-2004, 01:10 PM   #6
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If the motor is jdm you wont pass testing regardless of computer, or how good its tuned. They look at it as never being tested for american standards in the first place,(crash testing, emissions, ect.). So if you go with a jdm motor you might as well go with the computer that serves your needs best. I have a link wire in system, and it works great for me. BUT... when I did my swap they didnt have all the technology of reflashes and piggy-backs, if they did I would have had to really think allot harder about wich one to go with. The one cool thing about the link computer is that they also have the link ingnition system that enables you to use the individual coilpacks. That made it allot easier for me, I know one guy where they set his motor up with a distributer not coilpacks. That just seems like they took a step back in technology. It all depends on your needs and how far you want to go with your car.
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Old 03-19-2004, 01:15 PM   #7
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Quote:
Originally posted by ImprezvRS
If the motor is jdm you wont pass testing regardless of computer, or how good its tuned. They look at it as never being tested for american standards in the first place,(crash testing, emissions, ect.). So if you go with a jdm motor you might as well go with the computer that serves your needs best. I have a link wire in system, and it works great for me. BUT... when I did my swap they didnt have all the technology of reflashes and piggy-backs, if they did I would have had to really think allot harder about wich one to go with. The one cool thing about the link computer is that they also have the link ingnition system that enables you to use the individual coilpacks. That made it allot easier for me, I know one guy where they set his motor up with a distributer not coilpacks. That just seems like they took a step back in technology. It all depends on your needs and how far you want to go with your car.

I-speed got thier jdm wrx to pass smog.
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Old 03-19-2004, 02:21 PM   #8
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Passing the sniffer is one thing, legal is another thing all together.
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Old 03-19-2004, 02:27 PM   #9
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Ya, I think it was more then just passing the sniffer.... I dont have a link and cant find the info on thier site but you can email them for more.
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Old 03-19-2004, 02:40 PM   #10
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in hind site i wish i had gone with a usdm engine/ecu ..

the the tec works .. cept that it died and woun't start till i wiggeled wires today
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Old 03-19-2004, 03:01 PM   #11
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I am currently doing a JDM ej20g motor from a 1991 Liberty RS (2.0 turbo) into my 99 2.5rs.
We are running the 2 ecu's parrallel with each other. The JDM one to control engine management ect, and the 2nd one for all the electrical options ect...
The OBD1 that came with the Jspec motor factory pushes 12.9PSI to the VF8 turbo. We swapped the turbo with a TD04 (which is basically the exact same thing) and will just be adding a boost control, 3" exaust, and intake for the time being. This should push out 300hp or so easily and without the need for a LOT of tuning. It will take a bit of tuning, but not much...

The project is nearly done...
Dont get me wrong..it is much BETTER and EASIER to run a tec2 or tec3 ecu. I just am CURRENTLY working off of a fixed budget.

Later I will be putting a bigger turbo, injectors, and add a tec3.
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Old 03-20-2004, 10:49 PM   #12
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Quote:
Originally posted by ImprezvRS
If the motor is jdm you wont pass testing regardless of computer, or how good its tuned.
This is not true! And I speak from personal experience from when I lived in California and passed more than one JDM Honda engine through emissions. In reality passing the sniffer test is all that matters, if it APPEARS that the engine was a USDM engine. The smog referees do not know if the B16a or EJ20 in front of them came from an US or Japanese car. To them it is just an engine. And if the swap is done like factory, cleanly, with all of the proper emissions equipment (like all 3 cats on an EJ20) and the ECU is not throwing codes, you will pass. IF they were to connect an OBD-II scan to the ECU, it is likely that even then it would pass because the ECU would come up clean.

Furthermore, you could take a JDM EJ20 and use a USDM harness and ECU, and that too would pass. The long and the short of it is if a variant of the engine sold in the states, you can make it smog legal, even in CA. I went this route with one of my Honda swaps. It was all stock except for the engine that had better cams and a higher CR, but for somg testing the stock ECU was just fine. I just waited until afterwards to put on my header back and get the ECU chipped...

And this was all in CA. Many other states have way more leanient standards. Here in Colorado, if it has proper emissions equipment (cats) and tests clean at the pipe, then they will pass it. The whole thing about older engines in a newer car, that you cannot do (but can still get away with) in CA, doesn't even apply.

Jaxx,
If you are getting fed up with that TEC, I may have a Legacy Turbo ECU and harness you could use since I will be using the JDM Legacy Turbo harness and ECU on my swap.
As we've discussed, there may be a few issues with ignition and the injectors, but if you are interested, shoot me a PM...
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Old 03-20-2004, 11:40 PM   #13
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Matt is right.... OBDII relies on what the ECU tells it. The only JDM motors that absolutetly NEED the JDM ECU are the ver 7 and ver 8 to run the AVCS. My motor will never pass, unless I change the heads to non-AVCS and run a USDM WRX ECU. It is do-able!
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Old 03-22-2004, 03:35 AM   #14
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An n/a motor in a n/a car is harder for a ref to spot than a turbo motor in a n/a car. But I guess where there is a will there is a way.
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Old 03-22-2004, 04:04 AM   #15
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Quote:
Originally posted by Kreeger
Matt is right.... OBDII relies on what the ECU tells it. The only JDM motors that absolutetly NEED the JDM ECU are the ver 7 and ver 8 to run the AVCS. My motor will never pass, unless I change the heads to non-AVCS and run a USDM WRX ECU. It is do-able!
Why couldnt you avcs car pass? at most you could say its a motor out of an US STi and that you car would be a impreza STi on the reg. Just like 20 of my firends with civic GS-Rs... the jdm ecu is obd-II, so I dont see why it wouldnt pass a ref.
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Old 03-22-2004, 10:51 AM   #16
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Quote:
Originally posted by totoherbs
... the jdm ecu is obd-II, so I dont see why it wouldnt pass a ref.
The JDM ECUs are NOT OBD-II because I have had my computer scanned and done alot of research on the subject. I could get a USDM ECU, but I would have a hell of a time getting it to work.
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Old 03-22-2004, 11:08 AM   #17
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Quote:
Originally posted by Kreeger
The JDM ECUs are NOT OBD-II because I have had my computer scanned and done alot of research on the subject. I could get a USDM ECU, but I would have a hell of a time getting it to work.
Really...sure about that...

http://forums.nasioc.com/forums/show...ighlight=IM240
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Old 03-22-2004, 11:39 AM   #18
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