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Old 03-24-2014, 03:04 PM   #1
conoval21
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Default 2009 EJ257 STI standalone hardness for OEM ECU

I have a 2009 EJ257 STI engine that I'm looking to run standalone in a kit car with a factory ECU. Does anyone make an aftermarket harness to do this? Is it necessary to maintain the immobilizer or anything else within the harness for the ECU to work? Can I use a 2004 STI ecu instead?

Any help is much appreciated.
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Old 03-24-2014, 04:49 PM   #2
sexyyrex
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2009 WRB STi
2007 Nissan Altima

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Quote:
Originally Posted by conoval21 View Post
I have a 2009 EJ257 STI engine that I'm looking to run standalone in a kit car with a factory ECU. Does anyone make an aftermarket harness to do this? Is it necessary to maintain the immobilizer or anything else within the harness for the ECU to work? Can I use a 2004 STI ecu instead?

Any help is much appreciated.
The 09 is a DAVCS, so you'd have to delete the exhaust AVCS in order for an 04 STI ECU to work, and even then i'm not positive it'd still work. If you're looking for a standalone kit with the stock ECU, you're looking for nothing more then a piggyback. Some companies make adapter harnesses to have the ability to swap the stock ECU in and out as needed with the standalone harness when going for emissions, but I believe that's it.
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Old 03-24-2014, 11:26 PM   #3
conoval21
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Originally Posted by sexyyrex View Post
The 09 is a DAVCS, so you'd have to delete the exhaust AVCS in order for an 04 STI ECU to work, and even then i'm not positive it'd still work. If you're looking for a standalone kit with the stock ECU, you're looking for nothing more then a piggyback. Some companies make adapter harnesses to have the ability to swap the stock ECU in and out as needed with the standalone harness when going for emissions, but I believe that's it.
Thanks for the input. I'm only looking for a wiring harness that allows me to run the factory ECU in a standalone fashion. I know I can always run an aftermarket ECU with a custom harness or modified OEM harness, but need to retain the OEM ECU for this project. There has to be someone who does this regularly...
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Old 03-28-2014, 02:50 AM   #4
conoval21
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Anyone?
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Old 03-28-2014, 02:37 PM   #5
JoshP
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Someone like iWire, Numbchux etc could strip down the stock harness for you.
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