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Old 09-15-2010, 04:09 PM   #1
1hotsubaru
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Default EJ207: US ECU or JDM ECU???

Hey guys, i have a question... I have read and read lots of info, and some ppl say u need the jdm ecu if u want to swap a ej207, or that u can reuse the stock USDM wrx(2002) ECU... is this true? and if it is, what r the differences???
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Old 09-15-2010, 04:21 PM   #2
666stars
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Us ecu has no way to control the AVCS.
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Old 09-15-2010, 06:50 PM   #3
thebionicman
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I am pretty sure EJ207 V5/V6 don't have AVCS.
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Old 09-16-2010, 12:03 AM   #4
linuxbatm
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You can use either, but as said above the US ecu will not do AVCS. The ecu plugs right in and starts up, at least on a Bugeye WRX with the v7 motor.
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Old 09-16-2010, 11:28 AM   #5
1hotsubaru
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oh alright i gotcha, and yeah i wanna get the early v7 engine, with the bigger ports, and i def want AVCS, so ill go with the jdm ecu! thxs
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Old 09-16-2010, 12:53 PM   #6
shaggy-with scoobi
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I believe the later V7 had the big port, but dont take it as gospel
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Old 09-17-2010, 08:15 AM   #7
FuJi K
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Quote:
Originally Posted by 1hotsubaru View Post
oh alright i gotcha, and yeah i wanna get the early v7 engine, with the bigger ports, and i def want AVCS, so ill go with the jdm ecu! thxs
You best be sure that V7 is a Spec C or STi Spec C model. Reg Ver7 STi's do not have large intake ports. All Ver8's do. However the small ports can be ported out to flow just as good or better if need to be.
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Old 09-17-2010, 08:27 AM   #8
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Will a WRX ecu trigger a CEL if used with a JDM EJ207? Either because of avcs or because of a lack of TGV's?
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Old 09-19-2010, 01:26 AM   #9
FuJi K
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Quote:
Originally Posted by garface View Post
Will a WRX ecu trigger a CEL if used with a JDM EJ207? Either because of avcs or because of a lack of TGV's?
Well.... it will trigger the TGV, but the AVCS is will not know because it doesn't have AVCS and it doesn't know what AVCS is. You can have those CEL's turned off.

Run the EJ207 longblock with USDM intake mani and everything else on top.
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Old 09-24-2010, 05:33 PM   #10
slickonice
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I actually just got done swapping a v7 ej207 in my 02 wrx last week. After I got the new motor installed, it started up with the USDM ecu just fine. It did however have a check engine light and the car was pretty slow. The next day I went ahead and swapped in the JDM v7 ecu and the car started and ran much better but still had a CEL. I then installed the IA performance AVCS kit and started the car back up and the check engine light was gone and AVCS was working.
In my opinion, definitely get the Jap ECU and AVCS working on that motor. Night and day difference. Hope this helps some.
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Old 09-24-2010, 05:55 PM   #11
domestic_abuser
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Slickonice all you did was swap a EJ207 with a US ecu not tuned for the setup you had, so of course it's not going to run optimally. Getting the JDM ecu and the IA kit only enabled you to run AVCS. I'm assuming you had the entire swap turbo and all and on the US ecu anyone should expect the car to run like ****. Running the JDM ecu and having the AVCS kit would obviously be a help, but only by helping spool up.

My point is running the US ecu with a tune will be fine and still create just as much peak power as without AVCS enabled. I'm not saying don't do it, on a daily AVCS is a great thing. However if you look at many high horsepower cars they don't run AVCS cams because they are power limiting.
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Old 05-14-2013, 03:00 PM   #12
redline1785
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how do I tune my v7 ej207? do I need to buy standalone ecu, piggyback? Do I just go to a tuner with no equipment?
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Old 05-15-2013, 09:11 AM   #13
1hotsubaru
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Quote:
Originally Posted by redline1785 View Post
how do I tune my v7 ej207? do I need to buy standalone ecu, piggyback? Do I just go to a tuner with no equipment?
Easiest thing to do would be to go with an opensource tune on your stock ECU. The tuner will have all the equipment needed other than the green stuff
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Old 06-02-2013, 08:20 PM   #14
redline1785
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I just installed my V7 jdm on my bugeye and im running my wrx ecu because jdm ecu runs the car terribly right now. wrx ecu runs the motor very smoothly but it runs very rich because STi injectors are larger. Getting jdm ecu open source tuned next week by Mach V Manassas VA
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Old 06-02-2013, 08:39 PM   #15
25rsti
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Weird because my usdm ecu sucked at running my jdm v9 sti engine.
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Old 06-12-2013, 07:07 PM   #16
alexandern05
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I did v7 swap on my 04 wrx I had it tuned on wrx ecu now I got the sti ecu and I'm getting tuned for avcs either ecu needs to be tuned sti ecu due to diffrent fuel in us and wrx due to different compression ratio and no tgvs
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Old 06-15-2013, 11:38 AM   #17
95ONE
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I have the V8 and JDM ECU. I bought the car in this condition. It had a USDM wrx map on it that was tuned for the motor. Retarded. This combination was not utilizing the AVCS. Felt boggy down low. I used Romraider and loaded a JDM map. Night and day difference. Car feels fantastic. Of course, just in my opinion, to not use the AVCS on this engine is an epic fail.
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