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Old 02-05-2012, 05:46 PM   #1
Mx4Life
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Default JDM 98 RA/STI into my 93 legacy. Need help

I already have a 95 jdm ej20g engine in my car now getting ready to put a obd2 jdm ej20k engine in my car. Its a 93 legacy ss. what do I need to make the wiring work? can I use my same ECU then get it chipped or tuned? Need some answers if anyone has them. Trying to make a to do list. The engine will be shipped to my house this week so I am starting the process.

The engine is a: MFG Date-02/97 JDM Version 3 RA/STi. 4.44 DCCD Trans.
coming with no harness, no ecu. Has single coil (not individual coil pack)
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Old 02-05-2012, 05:51 PM   #2
subyboy
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Just swap the long blocks.
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Old 02-05-2012, 06:00 PM   #3
Mx4Life
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any more detail than that?
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Old 02-05-2012, 06:57 PM   #4
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Use the 20g manifold and wiring coil packs included and swap it all to the RA 20k. Use your existing ecu and wiring and you are good to go.
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Old 02-05-2012, 08:56 PM   #5
Mx4Life
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Doesnt the ver3 mani have way better flow? And this is what I found for OBD stuff. EJ20K is still obd1, even V5/6 EJ207 is still obd1.V7 EJ207 is the start of obd. So im not worried about the obd stuff anymore.

Am I going to run into fitment issues, plug relocation, or event the TMIC not fitting?
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Old 02-06-2012, 12:10 AM   #6
subyboy
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The 20g manifold has a larger plenum for more air. No you should not have any fitment problems if you use all the 20g plugs and TMIC.

If you are going to be using the turbo that comes with the VER.III RA block, you will need to use the RA manifold as you will need to utilize the under manifold intake. In that case you will just need to swap the wiring from the 20g manifold to the RA manifold and you should not have any issues.

You might need to swap the injectors as the RA injectors are going to flow more than the stock 20g injectors and your ecu is tuned for the 20g injectors. If you don't you could run pretty rich and get horrible gas mileage.
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Old 02-06-2012, 09:54 AM   #7
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The only reasonable way to do this without the EJ20K ECU and MAF is to reuse your EJ20G intake manifold, throttlebody, MAF, etc.

The EJ20G ECU will not work properly with the EJ20K throttlebody/TPS and MAF.

You could install the EJ20G throttlebody (and TPS) on the EJ20K manifold, but there are fitment issues to overcome. The cable is on the wrong side and the IAC interferes.

Without the proper ECU (or a programmable ECU) the upgrade will not be what your expecting.
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Old 02-06-2012, 02:55 PM   #8
Mx4Life
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I am going to get an ecu tune that works. People keep telling me to get a robtune ecu

Last edited by Mx4Life; 02-07-2012 at 03:05 PM.
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