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Old 06-20-2012, 12:31 PM   #1
808_wrx
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Default 03 wrx v7,v8 swap question

hey guys finally gettin around to fixing my 03 bugeye. i was planning to pick up a jdm v7 or v8 sti motor an ecu. my main concern is being that i live in hawaii we aint got much tunning options around here. will i be able to run on pump gas. i only have access to 92octane. should i run the stock ecu or the jdm one.. thanks for the help guys. the quicker i get this answered the quicker i pick up the phone an make an order haha
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Old 06-21-2012, 01:48 PM   #2
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would the stock ecu work ok until i can find a way to tune the v8 ecu
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Old 06-21-2012, 02:15 PM   #3
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You should be able to use the stock ECU and just re-tune it for the v8 STi motor
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Old 06-21-2012, 03:45 PM   #4
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You wont be using AVCS if you use your ecu. You also wont be using AVCS if you just plug you jdm ecu in. You need to wire in the AVCS OR buy the IAPerformance plug n play kit. Hit up ClarkTurner for an Etune.
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Old 06-21-2012, 05:20 PM   #5
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Originally Posted by 25rsti View Post
You wont be using AVCS if you use your ecu. You also wont be using AVCS if you just plug you jdm ecu in. You need to wire in the AVCS OR buy the IAPerformance plug n play kit. Hit up ClarkTurner for an Etune.
That sounds like a plan. When you say Etune would that be through open source tuning I was leaning toward buying the cable n downloading the software. Am I on track now ?
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Old 06-21-2012, 05:23 PM   #6
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Quote:
Originally Posted by Samurai Jack View Post
You should be able to use the stock ECU and just re-tune it for the v8 STi motor
Would my dealership be able to do that? We ain't got no tuning shops n stuff nearby. But working with the stock ecu they should be able to right
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Old 06-21-2012, 05:56 PM   #7
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Quote:
Originally Posted by 808_wrx View Post
Would my dealership be able to do that? We ain't got no tuning shops n stuff nearby. But working with the stock ecu they should be able to right

you can run your ver8 motor on a stock ecu but you will have no avcs. Get the iag wire kit and a version 8 motor plus ecu and your golden.

dealership wont know what to do unless one of the techs know how to or is into tunning
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Old 06-21-2012, 07:23 PM   #8
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Quote:
Originally Posted by 808-wrx View Post
you can run your ver8 motor on a stock ecu but you will have no avcs. Get the iag wire kit and a version 8 motor plus ecu and your golden.

dealership wont know what to do unless one of the techs know how to or is into tunning
will the jdm ecu run ok on 92 octane. thanks for the help man
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Old 06-21-2012, 08:29 PM   #9
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Do not drive the car aggressively before the ecu is retuned for 92 octane . The jdm ecu is tuned for much higher octane fuel. Contact Phatbotti tuning for a opensource e-tune

Last edited by 666stars; 06-21-2012 at 08:35 PM.
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Old 06-21-2012, 08:45 PM   #10
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JDM motors see around 98+ octane equivilent to the US gas.

You must tune the car via "electronic" tune or physically before pushing the car at all. You can cause catastrphic damage.

I suggest doing at least a good week or two, if not more research on jdm motors and tuning before doing what you're planning.
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Old 06-23-2012, 02:41 PM   #11
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thanks guys so i ordered my v8 sti complete twinscroll, ecu, every thing but the trans. going to order the avcs iaperformance wiring kit today. going to also order a tatrix cable an download the riight software thats what i need for an etune right at least to get goin
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Old 06-27-2012, 07:00 PM   #12
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^ did you have good luck reaching someone over @ iaperformance? I've been calling them but no answer. BTW can anyone source out the ECU by itself ? I need a version 7 jdm ECU!
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Old 06-27-2012, 10:38 PM   #13
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Quote:
Originally Posted by fr3dster31 View Post
^ did you have good luck reaching someone over @ iaperformance? I've been calling them but no answer. BTW can anyone source out the ECU by itself ? I need a version 7 jdm ECU!
Stephen at IA is on vacation until the 5th, check his site.

Call any place that sells swaps on the vendors thread they should have extra ECUs, a V8 ecu would also work for you.

I have a well sorted rom for running a V7-9 motor on 91 oct here in AZ, I have been working on it for a few months and it is DD stable. You are welcome to give it a go if you can flash it yourself
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Old 06-28-2012, 08:20 AM   #14
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Contact Jacob @ coolblue05 here in NASIOC

JDM Importer out of the Michigan I think. Easy to deal with
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Old 06-28-2012, 01:18 PM   #15
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Originally Posted by lukeskywrx View Post
Stephen at IA is on vacation until the 5th, check his site.

Call any place that sells swaps on the vendors thread they should have extra ECUs, a V8 ecu would also work for you.

I have a well sorted rom for running a V7-9 motor on 91 oct here in AZ, I have been working on it for a few months and it is DD stable. You are welcome to give it a go if you can flash it yourself
i may have to give your map a go when the time comes. motor will be here in about 2-3 weeks. thats the ****ty part about being in hawaii is the shipping times.
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Old 06-28-2012, 08:40 PM   #16
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Quote:
Originally Posted by lukeskywrx View Post
Stephen at IA is on vacation until the 5th, check his site.

Call any place that sells swaps on the vendors thread they should have extra ECUs, a V8 ecu would also work for you.

I have a well sorted rom for running a V7-9 motor on 91 oct here in AZ, I have been working on it for a few months and it is DD stable. You are welcome to give it a go if you can flash it yourself
Thank you guys the print was really small and went right over me...and coolblue05 was sent a message
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Old 07-16-2012, 04:23 PM   #17
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so heres an update on my swap. i received my sti v8 with twinscroll setup an WOW looks so nice haha. also my avcs wiring kit should be here today along with my tactrix cable. got the stock motor out already..sense this is goin in a 03 wrx is it a must to upgrade my fuel pump? or will it be ok
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Old 07-17-2012, 07:53 AM   #18
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Quote:
Originally Posted by 808_wrx View Post
got the stock motor out already..sense this is goin in a 03 wrx is it a must to upgrade my fuel pump? or will it be ok
What are you planning to do with the installed motor?
Is this just a swap with no intentions to upgrade?
What are you using for turbo, injectors, etc?

If you are going greater than 03 stock turbo, etc., then you will need supporting upgrades, including fuel pump
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Old 07-17-2012, 10:46 AM   #19
lukeskywrx
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Quote:
Originally Posted by 808_wrx View Post
so heres an update on my swap. i received my sti v8 with twinscroll setup an WOW looks so nice haha. also my avcs wiring kit should be here today along with my tactrix cable. got the stock motor out already..sense this is goin in a 03 wrx is it a must to upgrade my fuel pump? or will it be ok

Yes get a fuel pump, the stock injectors on the swap are the pink 560s.
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Old 07-17-2012, 12:41 PM   #20
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ok thanks you guys. yeah im gonna run the twin scroll setup so i guess ill need a fuel pump. heres another question the previous owner of my car long time ago i heard did a bunch of upgrades to this car then put it back near stock before he sold it except for the uppipe n intake, bov ect minor bolt on's. sense he had an aftermarket turbo is there a way to check if he installed a fuel pump, without taking out my back seat just to check..thanks for all the help once again
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Old 07-17-2012, 01:10 PM   #21
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No, you can't just guess.

Make sure what you have for injectors
Make sure they will support the fuel flow to whichever turbo you use
Make sure you have the correct fuel pump.

How do you expect to tune this if you have little to no tuning options in your area?

Check your local forum for tuners.
You could also call some well known tuners on the West Coast and see if they can recommend someone in your area
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Old 07-17-2012, 01:35 PM   #22
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i wasnt guessing haha. im running a V8 sti stock twin scroll.stock everything motor wise. i was saying the old owner of my car might of installed a fuel pump is there a way to tell?
as far as tuning im goin the open source route an get an e-tune from Phatbotti tuning
Quote:
Originally Posted by Samurai Jack View Post
No, you can't just guess.

Make sure what you have for injectors
Make sure they will support the fuel flow to whichever turbo you use
Make sure you have the correct fuel pump.

How do you expect to tune this if you have little to no tuning options in your area?

Check your local forum for tuners.
You could also call some well known tuners on the West Coast and see if they can recommend someone in your area
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Old 07-18-2012, 03:10 AM   #23
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fuel pump wise the only way to tell is by pulling the pump itself out of the tank and reading the numbers on the side of the pump.

if you dont have a pump get one asap! and make sure its not a take off they die really fast.
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Old 07-18-2012, 12:58 PM   #24
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thanks man. should be easy to tell the difference between the stock wrx one an aftermarket. in a 2003 wrx can i get to it from the trunk or do i gotta take out the back seat
Quote:
Originally Posted by amroof View Post
fuel pump wise the only way to tell is by pulling the pump itself out of the tank and reading the numbers on the side of the pump.

if you dont have a pump get one asap! and make sure its not a take off they die really fast.
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Old 07-28-2012, 01:25 AM   #25
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Motor is in I just have to get a few things plugs belts ect an it's finished I will get pics ASAP
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