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Old 05-31-2017, 10:09 PM   #1
Scooby Newbie
Member#: 468600
Join Date: May 2017
Default 2002 wrx jdm swap

So I swapped a jdm ej205 into my 2002 wrx and I got it running. The only thing that isnt stock is the turbo its a vf39. Also I am using the jdm ecu. Now I know it needs a tune but I'm sure it should run better than it does. So I'm getting a surging idle it will go from about 1100 to 1800. And when I get on it while driving it, it has no balls and very hesitant and laggy. If anyone could help me out on what the problem is that would be awesome. I'm new with subarus so I dont know a whole bunch about them. Also I ordered a bunch of stuff. A silicone turbo inlet hose, 750cc deatshwerks injectors, a short ram intake, invidia catless down pipe, invidia catless uppipe, and a grimm speed 3 port boost controller. That will be going on before I get a tune. But I need to get the car running at least drivable so I can drive it to get it tuned.
Any help is appreciated thank you.
I couldnt find anything specificly about my problem I am having so I started a new thread.
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Old 05-31-2017, 10:31 PM   #2
Scooby Newbie
Member#: 443793
Join Date: Mar 2016
2016 WRX m6 ISM
2005 F-150 FX4


Best of luck with all that

Last edited by humpthebobcat; 06-01-2017 at 12:19 AM.
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Old 06-01-2017, 12:08 AM   #3
Scooby Specialist
Member#: 460907
Join Date: Jan 2017
Chapter/Region: RMIC
Location: Colorado
2016 WRX
Phatron Tuned


Wrong forum. Yiu want Ej not Fa.
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Old 06-01-2017, 07:05 AM   #4
Scooby Specialist
Member#: 416107
Join Date: Mar 2015
Chapter/Region: International
Location: Ontario, Canada
2002 WRX Wagon
EJ207 Spec C 4EAT


drive like a granny to your tuners and you'll be fine. stay under 3000rpm, dont hit boost, and dont go over 50% throttle. stay off the highway. worst case is you'll foul your plugs. bring a new set to swap in before your tune.

if this is not an option for some reason (like your tuner being far away) then you 100% need a base map before going anywhere or start looking for a way to tow it there. driving on an un-tuned subaru is a no-no.
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Old 06-02-2017, 12:18 PM   #5
Scooby Specialist
Member#: 42548
Join Date: Aug 2003
Chapter/Region: NWIC
Location: Portland, OR
1999 GF8 V7 STi Swap
Aspen White


Does the JDM 205 you swapped in have AVCS?

If so, did you wire it in properly? Without AVCS, the JDM motors can feel laggier and dead down low.

Guessing there part of your is issue based on using the vf39 without a tune as well.
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