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Old 11-14-2020, 07:56 PM   #1
rocketsled
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Member#: 35223
Join Date: Apr 2003
Chapter/Region: SWIC
Location: Seligman, MO
Vehicle:
2002 WRX Wagon
WR Blue

Default 2005 OBXT w/ EJ20X Swap Help

Hey all,

Just finished swapping an EJ20X into a 2005 Outback XT that I bought with a blown engine. The Outback was completely stock before this swap.

Now the cars setup is as follows:

JDM EJ20X w/twin scroll vf38 setup(catless uppipe)
TGV Delete
USDM ECU and Harness
USDM Yellow Injectors (540cc?) Have the JDM blues but heard they flow less.
Custom 2.5 Catless DP to Stock Exhaust (one cat)
91 Octane

JDM Manifold
JDM Throttle Body
JDM Cam Sensors
JDM Crank Sensor
USDM Knock Sensor
USDM Map Sensor
USDM MAF Sensor
JDM Cams in factory position
Exhaust AVCS unplugged

Pretty much used everything that I could from the EJ20x that would plug in directly. Only changed the Map sensor trying to troubleshoot this problem.

So tried to start this thing yesterday and it did start and idle but very rough. Seemed like only two cylinders firing. Let it idle a few seconds and then tapped throttle and it died immediately. Tried to restart but now only stumbles, backfires and dies. Checked that fuel is good and getting to motor. There is a chance that the injectors are gummed up as I am guessing the blown motor was sitting for awhile but seems slim. Really seems like a timing issue. Like when it idled on the first start the cam position was just barely allowing it to run but when I tapped the throttle the position changed and now is to far out to run.

I have not touched any of the tuning yet but am under the impression that it should at least idle somewhat smoothly on the factory EJ255 map. Can anyone here confirm that?
Is it possible that these changes would be enough to cause my issue?
Displacement
TGV Deletes
Uppipe Cat gone
Downpipe Cat gone

My next plan of attack is to mess with the fuel maps. Anybody got some helpful info? Thanks in advance!
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Old 08-26-2021, 10:59 PM   #2
Rastaman420
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Member#: 433874
Join Date: Nov 2015
Location: Green Bay, WI
Vehicle:
2006 Impreza WRX
Blue

Default Bump

So what ever happened with this swap? Did you get it to work?
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Old 08-27-2021, 10:58 PM   #3
jeffambo
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Member#: 507933
Join Date: Nov 2019
Chapter/Region: BAIC
Vehicle:
2013 WRX Base Hatch
Obsidian Black Pearl

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I’m going through the same thing but I can’t get mine to start, I’ve troubleshooted just about everything
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Old 08-28-2021, 12:53 AM   #4
K3rm1tth3fr0g
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Member#: 508105
Join Date: Nov 2019
Chapter/Region: NWIC
Location: Greater Seattle Area
Vehicle:
Link G4X flex tuned
02' EJ205 20G 6MT wagon

Default

Ej20x sucks!
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Old 08-28-2021, 06:38 AM   #5
snow_bound26
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Join Date: Jul 2014
Chapter/Region: Tri-State
Location: SLC and Lake Placid
Vehicle:
2005 92x Aero
Beige

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Quote:
Originally Posted by K3rm1tth3fr0g View Post
Ej20x sucks!

What makes you say that?
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Old 08-28-2021, 10:44 AM   #6
K3rm1tth3fr0g
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Join Date: Nov 2019
Chapter/Region: NWIC
Location: Greater Seattle Area
Vehicle:
Link G4X flex tuned
02' EJ205 20G 6MT wagon

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Quote:
Originally Posted by snow_bound26 View Post
What makes you say that?
Every tuner I've ever talked do has told me they're garbage motors for USDM swaps - was considering swapping one into my buddies 06.

If you can get the AVCS fully functional, they're a little better, but they are just not great engines. You really need E85 to have good torque. There's a reason they're so cheap - they're commuter economy based motors. people see the black intake and think OMG IT MUST BE BETTER.

They have really high compression and it takes so much work to make it worth it with the AVCS - https://www.flatironstuning.com/blog...x-ej20y-engine

Last edited by K3rm1tth3fr0g; 08-28-2021 at 01:27 PM.
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Old 08-28-2021, 02:12 PM   #7
snow_bound26
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Location: SLC and Lake Placid
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2005 92x Aero
Beige

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I agree they are too difficult to be worth the effort in the US market value the cost of rebuilding a 257 the right way or going 207. But they are actually quite capable; better than the 205 but not as good as a 207. Aussie's push them harder than we can push OEM 257/255 short blocks. The 9.5:1 CR is hard to use on our pump gas and make power. But if someone is looking for a good starting point for stand alone EM with a dedicated track car and doesn't have the money for a 207 or build 257, then it can be done with reliability to 400ish hp. But for a daily driver or "quick" swap for a blown engine, then I completely agree they aren't worth anything when considering the complexity of the swap.
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Old 08-28-2021, 02:17 PM   #8
K3rm1tth3fr0g
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Member#: 508105
Join Date: Nov 2019
Chapter/Region: NWIC
Location: Greater Seattle Area
Vehicle:
Link G4X flex tuned
02' EJ205 20G 6MT wagon

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Quote:
Originally Posted by snow_bound26 View Post
I agree they are too difficult to be worth the effort in the US market value the cost of rebuilding a 257 the right way or going 207. But they are actually quite capable; better than the 205 but not as good as a 207. Aussie's push them harder than we can push OEM 257/255 short blocks. The 9.5:1 CR is hard to use on our pump gas and make power. But if someone is looking for a good starting point for stand alone EM with a dedicated track car and doesn't have the money for a 207 or build 257, then it can be done with reliability to 400ish hp. But for a daily driver or "quick" swap for a blown engine, then I completely agree they aren't worth anything when considering the complexity of the swap.
My tuner disagrees directly with the statement that they are better than the 205s, he said he'd prefer a 205 every day or the week. I've also talked about it with Dom and he hates them.

A JDM 205 can make ~400whp on a dynojet too

Dedicated track car with standalone that just runs ethanol? Sure maybe, but it's going to be pretty expensive to wire up the DAVC to make it worth it unless you do it all yourself + the cost of the standalone ECU - which kind of negates the entire purpose of it being cheap.
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Old 08-29-2021, 08:38 PM   #9
awfulwaffle
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Location: SE MI/SE WI
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2005 LGT
ABP

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Should start on the USDM map. One we dropped in the wife's OBXT started and ran first try before we tuned. Seconded the need for E85 to wake the motor up.
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