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View Poll Results: will an udsm ecu/harness work with a jdm motor?
heck yeah it will work! 4 36.36%
i dont know...why dont you try and tell us what happens! 4 36.36%
youre a retard... 3 27.27%
Voters: 11. You may not vote on this poll

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Old 05-11-2008, 12:36 PM   #1
route69wrx
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1996 STiL wagon
2002 MBP bugeye

Question some swap questions

so ive been pondering some ideas on how to make a swap pass emissions with obd2 and help reduce chances of spinning rod bearings so here goes...

take the ej20k, remove the block, pull the pistons and swap them into an
ej205 block, thereby getting rid of the older rod bearing design. replace main and rod bearings with acl race bearings, new head bolts, gaskets and oil/water pumps, put motor in car.

next take the wiring harness and ecu from an 02 wrx and wire the jdm motor up with it and use openecu to tune the setup. i already have the 02 wrx fsm for wiring, an ej205 shortblock in my garage and i can get a harness and ecu from an 02 for much less than i can get a powerfc or standalone ecu. in theory if the wiring will work, since all ej20's share the same sensors, i can pass emissions 'legally' with obd2 since the ecu will be from a usdm car and i can turn off and cel's that might pop up using openecu...

i also want to try and use a cluster from a newer RS since the L cluster uses the mechanical speedo cable from the trans and the wrx is electronic. anybody know if the later model RS clusters use the mechanical cable or if they are electronic?
swap car is a 96 L wagon...the motor is a 98 v4 ej20k.
thoughts? anybody try this or think it will work or not work?
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Last edited by route69wrx; 05-14-2008 at 01:49 AM.
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Old 05-11-2008, 07:17 PM   #2
ciper
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Which year/model/country car is providing the intake manifold, sensors and heads?
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Old 05-11-2008, 09:15 PM   #3
route69wrx
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i want to use the 98 jdm ej20k heads, intake and pistons with the wiring harness/sensors/ecu and block from a 02 usdm ej205 wrx.
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Old 05-11-2008, 11:00 PM   #4
ciper
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Well it won't be plug and play thats for sure. My limited experience says that if you are able to follow wiring diagrams you should be able to graft a majority of the sensors to the new harness. There may be a few that will need to be replaced to match the new age WRX setup.

For example I swapped two NA motors from different generations once and off hand I remember the knock sensor was electrically compatible but the older unit had a single pin connector while the newer one had two. Same thing for coolant temp sensors, old cars had a 1 pin sensor for the dash and a 2 pin connector for the ECU while newer cars have a single 3 pin sensor.
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Old 05-12-2008, 01:33 AM   #5
route69wrx
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i know it wont be plug and play for sure!
we pretty much figured we can adapt the sensors on the 20k to the wrx harness or just use usdm sensors in place of the jdm ones where nessecary and use a wrx throttle body on the jdm manifold for tps and iac control...
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Old 05-12-2008, 02:44 AM   #6
ProRallyEric
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What's wrong with usdm heads with some good valve springs?
Then it's plug n play.
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Old 05-12-2008, 02:54 AM   #7
route69wrx
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Quote:
Originally Posted by ProRallyEric View Post
What's wrong with usdm heads with some good valve springs?
Then it's plug n play.
nothing i guess, they are great on my bugeye!
i have a complete jdm ej20k motor and a usdm ej205 shortblock, no heads...
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Old 05-12-2008, 12:02 PM   #8
Jaxx
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why am i the only one so far to vote "you're a retard"

cam pickups on the ej20k are different and the diameter of the cam shaft is different / not compatible with the ej205
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Old 05-12-2008, 12:36 PM   #9
peacockSTI
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I have put three ej20g engines into two '98 RS's and 1 99' L. I used the stock intake manifolds, tapped for the EGR valves, and used ALL of the factory RS sensors. All three vehicles pass DEQ here in Oregon. Good luck with all the hoopty rigging! It can be done, dont let anyone here who hasent actually done it tell you otherwise. Just be creative, it sounds like you allready have the knowledge!
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Old 05-12-2008, 02:06 PM   #10
Jaxx
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it can't be done with a usdm WRX ECU (well not easily, its been done once -some one cut the gears apart and welded them back together ..)

the cars you listed used low density pickups
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Old 05-12-2008, 08:16 PM   #11
route69wrx
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Question

this is the kinda stuff i dont know, thats why i asked the question. i just hoped people would answer in less of a 'i know everything about everything and youre stupid cuz you dont' manner and maybe offer some insight as to why they think it wont work, but i guess you cant expect that here...


im sure its not common knowledge that:
'cam pickups on the ej20k are different and the diameter of the cam shaft is different / not compatible with the ej205'
the heads bolt to the block, so i dont see why the cam shaft diameter would make any difference...

and i have no idea what this means...
'some one cut the gears apart and welded them back together'
what gears and why?

'the cars you listed used low density pickups'
what is a low density pickup?
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Old 05-13-2008, 12:22 AM   #12
Jaxx
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1 you chose the poll titles not me & you didn't have a the correct option -no,not with an ej20g/k/h/r yes for a ej205/6/7/8

2-A you need ej205 gears to make with the correct high density pickups to make your usdm ecu work
2-B you can't bolt a ej205 gear to a ej20k cam shaft the diameter is different ...

3 cam gears ...a guy in WA cut his ej205 cam gears apart and welded the the pickups onto a low density gear, very precise and difficult work

4 - this may not be a project for you ...
#s are unimportant but -low density has less pickup points than a high density
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Old 05-13-2008, 01:36 AM   #13
route69wrx
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Quote:
Originally Posted by Jaxx View Post
1 you chose the poll titles not me & you didn't have a the correct option -no
2-A you need ej205 gears to make with the correct high density pickups to make your usdm ecu work
2-B you can't bolt a ej205 gear to a ej20k cam shaft the diameter is different ...
the poll was kinda a joke...
you kinda insinuated that im a retard for asking a legitimate question that i havent seen addressed before and for not knowing small details that wouldnt be common knowledge amongst most people.
however i do apperciate the fact that you actually provide useful information and not the usual 'no.'.

so in simple terms you're saying that the cam position sensors are different or the cam gear position projection the sensor reads is different or both?
is the 20k cam gear shaft larger or smaller in diameter than the 205 gear?

Last edited by route69wrx; 05-13-2008 at 01:52 AM.
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Old 05-13-2008, 11:20 AM   #14
Jaxx
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you called your self a retard, i agreed
205 gear has more notches (*points*) if you will
not actually sure on the diameter monsen has physically tried it ..

there was some real research done in this field a few years back .. the gda ecu is sooo much better and easily editable that if it would have worked i would have one on my car ..
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Old 05-13-2008, 09:18 PM   #15
route69wrx
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Quote:
Originally Posted by Jaxx View Post
you called your self a retard, i agreed
205 gear has more notches (*points*) if you will
not actually sure on the diameter monsen has physically tried it ..

there was some real research done in this field a few years back .. the gda ecu is sooo much better and easily editable that if it would have worked i would have one on my car ..
haha, where did i call myself a retard?

so the sensor is the same, just the actual cam gear itself is different?


what kinda spark plugs/wires are people using in their 20k's?
can this motor be converted to use coilpacks or is the ignition system on
20k's good from the factory?
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Old 05-13-2008, 10:38 PM   #16
Jaxx
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Quote:
will an udsm ecu/harness work with a jdm motor?
heck yeah it will work!
i dont know...why dont you try and tell us what happens!
youre a retard...
bkr7e or platinum equivalent, factory wires via wasted spark and a ej20k ecu
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Old 05-21-2008, 05:15 PM   #17
chung87
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Default EJ253 longblock to 2007 WRX Long block

what is needed to swap a wrx longblock into a 2007 impreza chassis?
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