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Old 02-11-2014, 09:29 PM   #1
Alkaline198
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Join Date: Apr 2012
Default Ej 207 build

2004 wrx ej205 to ej207
Hi all, im new and just wanted some opinions/ideas for my new engine.

My 04 wrx engine just died (combo of negative temp days, wrong oil maybe, improper upgrading by previous owner..) anyway, that shenanigans aside- i decided to go the ej207 route instead of finding another ej205 oem.

The day the engine arrived, the shop informed me that this engine came with a twin scroll turbo. They asked if i want to go ahead with the instal and recommended a tomioka TS usdm fit downpipe and a catless bell mouth downpipe. They also want to do an open source dyno tune instead of the Cobb accessport route.

Also a 76mm invidia q300 catback system
-- aem cold air intake
-- gates timing belt
-- they said a new uppipe is not needed

Any thoughts here, are these suggestions inline with what you guys have done?

Thanks in advance!

Im in Pa, usa by the way
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Old 02-11-2014, 09:48 PM   #2
207STi
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well Im assuming its a v8 ej207 if it has a twinscroll setup. Everything the shop suggested makes sense and is pretty much standard operating procedure for these swaps. A solid stage 2 setup on a 207 should make some great power.
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Old 02-11-2014, 10:41 PM   #3
Alkaline198
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Yes it was v8, do you know if they will run into issues with the avcs? Or will it go smooth as long as i have the ej207 ecu
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Old 02-11-2014, 11:01 PM   #4
207STi
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Quote:
Originally Posted by Alkaline198 View Post
Yes it was v8, do you know if they will run into issues with the avcs? Or will it go smooth as long as i have the ej207 ecu
With the 207 ecu and the IAperformance avcs wiring harness you should have functioning avcs.
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Old 02-11-2014, 11:02 PM   #5
02nismokiller
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Quote:
Originally Posted by Alkaline198 View Post
Yes it was v8, do you know if they will run into issues with the avcs? Or will it go smooth as long as i have the ej207 ecu
They or you need to run a few wires or buy the pre made harness to make the avcs run
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Old 02-11-2014, 11:06 PM   #6
Alkaline198
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What are the pro/cons of wiring it vs not
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Old 02-11-2014, 11:22 PM   #7
RexWagonWA
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Do you need to pass emissions? Is there a visual inspection?
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Old 02-11-2014, 11:48 PM   #8
Alkaline198
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I assume it will need to pass standard PA emissions
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Old 02-12-2014, 01:51 PM   #9
207STi
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Quote:
Originally Posted by Alkaline198 View Post
What are the pro/cons of wiring it vs not
I ended up having issues with my avcs that prevented me from using it when I initially had my car tuned. What I can say is the car felt extremely sluggish out of boost. I found myself downshifting into 5th on the highway to climb a hill. When I had the car re-tuned with avcs I picked up a very noticeable bump in torque in the low and mid end. If you don't wire it up you will be missing out on the real ej207 experience, trust me.
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Old 02-12-2014, 06:16 PM   #10
Concillian
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Quote:
Originally Posted by Alkaline198 View Post
Yes it was v8, do you know if they will run into issues with the avcs? Or will it go smooth as long as i have the ej207 ecu
1) Cobb has no maps for 16 bit ECU with AVCS. This is why the shop recommended open source. Cobb mapping will mean no AVCS

2) Will they run into issues? Ask them, not us. It's relatively simple to wire AVCS into the 02-05 USDM harness if you have the know-how. A wiring kit like IA makes helps if you don't know what you're doing.

To answer with / without AVCS it's about 500 RPM in spool and a subjective "ton" of off-boost torque. I'd equate the off-boost torque difference as roughly feeling like adding 0.3 to 0.5L displacement. It's big.
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Old 02-12-2014, 08:34 PM   #11
Alkaline198
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Thanks guys. Ill def have them get the IA harness and hook up avcs-- keep posted for updates and pics
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Old 02-18-2014, 09:26 AM   #12
Alkaline198
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Can i attach images from my computer
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Old 02-18-2014, 10:11 AM   #13
181stLeader
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^To my knowledge the USDM Cobb Acessport isn't compatible with the JDM ECU. Open source is the way to go!
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Old 02-18-2014, 10:57 PM   #14
spoolinsti05
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Or ecutek
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Old 03-07-2014, 10:53 AM   #15
Alkaline198
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Well i got the car back- its got some issues- does anyone know if the 04wrx TCM needs a jumper or something modified to work with JDM v8 ej207 engine?
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Old 03-07-2014, 11:01 AM   #16
canada88
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I just did this swap into my 04 WRX.


but I used a Ver9 JDM STi motor with a Ver8 ecu non-immobilized.

got the motor install last weekend Firday and Saturday it was done.
On Monday I wired up the avcs and was running great.

Also installed a Exedy Lightweight Flywheel, and Exedy stock clutch kit.
and because I love the Opening Ceremony, I got a Ver8 JDM Cluster and installed that with very easy install.

Very pleased with the way it turned out.
Great increase compared to the crappy ej205 lol.

Wanting to get some 750-850 injectors, turbo inlet and downpipe before I tune it.
but running the stock downpipe with gutted cats right now.
It pulls pretty good.
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Old 03-10-2014, 07:29 PM   #17
Alkaline198
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My at oil temp light is flashing and the car shifts at high revs and jerk motion. No cel or obd codes showing. Replaced tcm with new one same issue... Any ideas what might be wrong? I know they had to instal the ia harness for avcs- would this be anything? Also they had to custom wire the ej207 v8 ecu to work with the car. Ideas????
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Old 03-10-2014, 08:26 PM   #18
fastnoypi
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MY01 EJ207 HTA35r
nothing to see, i'm stock

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Quote:
Originally Posted by Alkaline198 View Post
My at oil temp light is flashing and the car shifts at high revs and jerk motion. No cel or obd codes showing. Replaced tcm with new one same issue... Any ideas what might be wrong? I know they had to instal the ia harness for avcs- would this be anything? Also they had to custom wire the ej207 v8 ecu to work with the car. Ideas????
what did the shop that did the swap suggest so far?
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Old 03-11-2014, 02:42 AM   #19
Alkaline198
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I replaced the tcm but they think the maf sensor wire requires pin work on the ecu and testing to be sure the voltages are correct
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Old 03-11-2014, 07:40 AM   #20
some dude
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I would be thinking about the shop working out the bugs. You payed them to install it and they didn't do it right.

They want you to pay more money for them to get in there to test voltages on individual wires on the install job they did?

You don't pay for their mistakes / incompetence. If they think it's the wiring they need to fix the job you payed them to do. The job they said they could do and took your money to do. You already payed for it.

That's what I'm thinking right meow.
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Old 03-11-2014, 09:09 PM   #21
Alkaline198
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Ok.. So now i have the two green/white wires pin 28 tied back together and tapped into the maf signal wire the pink-blue. After i drove it seemed to shift normal again but the at oil temp still flashing. The car started sputtering like out of gas and shortly after it would not move forward... Any ideas at this point, almost seems like the transmission fluid burnt up? Would this be the problem and/or also cause the flashing light?

Ideas?
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Old 03-12-2014, 07:55 AM   #22
baldhooter
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I could be entirely wrong but that sounds remarkably similar to when I spun a bearing in my RS several years ago.
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Old 03-12-2014, 02:59 PM   #23
rdieder
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Why are you messing with wires when you paid a shop to do the swap? If you do blow up from fiddling around, they are completely off the hook.
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Old 03-18-2014, 10:40 AM   #24
Alkaline198
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Its back at the shop. The transmission line pressures are very low. What normally causes that
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Old 04-20-2014, 03:44 PM   #25
Alkaline198
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Had the 4eat rebuilt and upgraded the clutch holding capacity. Also put in a shift timing kit to make it shift nice and firm. Loaded the AT roms from a jdm non sTi WRx. They didnt work correctly. Went back in and repinned the ecu/tcm to run the at load off the maf signal. Also repinned some wires to get the correct torque signals.

Car runs great now- very quick.

Recap:::
Ej207 swap into 4eat 2004 WRX
Downpipe
Twin Scroll
Cat back
Air Intake

Dyno tuned
285/320 whp/wtq

Last edited by Alkaline198; 05-29-2014 at 12:57 PM.
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