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Old 12-10-2011, 11:50 PM   #1
04pageSTI
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Default JDM Spec-C Type RA-R swap HELP!!!

Here's the story:

04 STI Engine was blown, so my mechanic which is a master tech for Ford, order an engine online. When we recieved the engine we realized it was the JDM spec C-type RA-R with the twinscroll turbo (not the engine we bought). The company only allowed a 7-day return policy therefore we ended up keeping the engine.

Here's the problem:

04 STI US engine used the electronic throttle through the ecu, where the JDM uses a throttle body cable. The CAM position sensors are different also.

We were considering using a wrx engine harness which we think would solve the CAM position sensor problem, but are unsure of this solution.

Please anyone help! If you've done a JDM swap into an STI or WRX.

Any help would be appreciated.

Thanks!
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Old 12-11-2011, 01:17 PM   #2
sense of nature
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So u bought a Jdm Spec C Long Block & need a USDM STI motor...?
I'll trade you ..
Seriously ?.. Sounds like a troll
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Old 12-11-2011, 03:07 PM   #3
Badler
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Pretty sure you'll need the JDM ecu or a standalone.
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Old 12-11-2011, 03:15 PM   #4
Kris.is.awesome
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The JDM motor will run on a US ecu.

I'm not sure, but can you not swap throttle bodies?
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Old 12-11-2011, 05:09 PM   #5
Vlad
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A RA-R would be a '07.

Post a picture of this, so we can better help you.

This should come with engine harness and ECU. Do you have these?

With these you would have to convert to throttle by cable, to do everything right.

If you have the engine harness that comes with it, you should be able to do the swap, once you do the conversion.

Cobtact IAP to purchase the wiring diagram of your engine and download the wiring diagram of the Sti from the net.
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Old 12-11-2011, 08:31 PM   #6
sense of nature
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Worst case , swap the IMw/ rails & engine harness
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Old 12-12-2011, 05:07 AM   #7
04pageSTI
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almost positive its the RA-R

i'll post pics as soon as I can, but yes it came with the wiring harness and ecu. I think we have come to the conclusion that we are gonna have to switch to the throttle body cable.

And we originally just wanted the USDM but they shipped us the JDM instead, and no sorry not lookin to trade
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Old 12-12-2011, 01:19 PM   #8
02 Scoob-TN
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Trust me if you do it right the JDM is so much better!!
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Old 12-12-2011, 02:56 PM   #9
durania717
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Wow, I am anxious to see the picture. If it is RA-R, you got a gem.
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Old 12-12-2011, 04:49 PM   #10
jzk25
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If it's a reluctor type rear cam sensor you can convert these to hall effect with an electronic box.

You would be better to use an aftermarket ecu or factory RA-R ecu to get the best out of the engine. If it's really an RA engine it'll be handbuilt and have around 230kw factory. Also has VF36 turbo, one piece inlet manifold, larger headers, hard intake pipe etc.

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Old 12-14-2011, 07:32 PM   #11
04pageSTI
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Anyone know where I can get a full wiring diagram for this JDM engine?
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Old 12-14-2011, 08:53 PM   #12
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http://www.iaperformance.com/
Send them an email or call them and ask for the wiring diagram, it's not cheap and it's in Japanese.
Even so, it's easy to figure out, when you put it side-by-side with the USDM diagram in English.
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Old 12-14-2011, 09:56 PM   #13
69subaru360
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It's probably a version 8 sti engine.

Get an 02 or 03 usdm wrx harness, add in the couple extra wires for the avcs and run it on a jdm verison 8 ecu. Get a cable gas pedal.

It's not really a big deal.
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Old 12-23-2011, 07:58 PM   #14
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Quote:
Originally Posted by 69subaru360 View Post
It's probably a version 8 sti engine.

Get an 02 or 03 usdm wrx harness, add in the couple extra wires for the avcs and run it on a jdm verison 8 ecu. Get a cable gas pedal.

It's not really a big deal.
^This....
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Old 01-01-2012, 06:17 PM   #15
KingKoopa
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you can find an adapter plate to mount your stock dbw tb to that manifold. if not find a 02-03 wrx part out on here or else where and buy the throttle cable/ pedal assy. and like he said use the wrx engine harness and add wires for avcs. <- i wish i had thought of that after i bought a v8 ej207 for my 07 sti. biggest problem i ran into was the difference in ecu, the usdm ecu's are 32 bit and the jdm are 16. my biggest concern was about the rest of the body harness communicating. now that i look back i think it wouldnt have been as hard as i thought but im happy with what i have now.
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Old 01-02-2012, 09:07 AM   #16
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For this type of situation, 32bit/drive by wire, I hope someone decides to do a V10 swap and then we'll know how that goes.
At the time I bought my V9, JDMracingmotors did have a V10 in stock.
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Old 01-04-2012, 04:08 PM   #17
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post up some part numbers
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Old 01-16-2012, 01:04 AM   #18
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any progress?
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Old 02-26-2012, 07:49 AM   #19
kyran013
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how's it going now?
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Old 03-02-2012, 08:46 PM   #20
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I'm gonna go out on a limb and say it is a Spec-C motor judging by that turbo inlet. Those are the Spec-C ones.
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Old 03-02-2012, 09:34 PM   #21
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Quote:
Originally Posted by Tanktheory View Post
I'm gonna go out on a limb and say it is a Spec-C motor judging by that turbo inlet. Those are the Spec-C ones.
i dont think that pic is of his motor. post pics of the motor ^op.
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Old 03-03-2012, 06:58 AM   #22
yaser71180
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you are really lucky, JDM much much better than USDM
in middle east we have USDM cars, but we used to bring JDM engines from Japan and people are doing the swap either from 2.5 STI or even from 2.0 injections to JDM 2.0 STI

but the problem that my friend is having the wiring diagram in his mind, I will ask him if he know any site or document for JDM wiring diagram
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Old 03-15-2012, 04:18 PM   #23
uv_blue
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Easy fix, send me your motor and everything I send you a usdm sti motor drop it in and go lol
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Old 06-06-2012, 11:25 PM   #24
lukeskywrx
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There is hope for those who search, but seriously its not that hard. And the RA-R comes with a VF42, the Spec-c RA comes with the VF36. The 42 is a basically a VF48 compressor and a special turbine wheel in the standard TS exhaust housing with the VF36 roller bearing CHRA. I have been looking to make one from my VF36 but cannot find the special turbine wheel.

http://importsnc.com/forums/motionla...-295ftlbs.html

Last edited by lukeskywrx; 06-06-2012 at 11:31 PM.
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