RomRaider Logo

RomRaider

Open Source ECU Tools
 FAQ •  Register •  Login 

RomRaider

Documentation

Community

Developers

It is currently Sat Feb 21, 2026 11:26 am

All times are UTC





Post new topic Reply to topic  [ 5 posts ] 
Author Message
 Post subject: '04 WRX 2.5 NON HYBRID SWAP STAGE 2
PostPosted: Sun Nov 05, 2023 3:51 pm 
Offline
Newbie

Joined: Sun Nov 05, 2023 3:33 pm
Posts: 3
Created a basemap for my 04 wrx with an ej255 swapped in. I'm hoping someone can take a look at it to be sure I'm not about to blow up the engine or ecu when I upload it. The map was originally a stock wrx rom and I copied a bunch of values from an 04 fxt stage 2 map.

Mods:
'05 LGT longblock (engine only) minus intake cams and avcs
Pink STI injectors
Full exhaust
Cold air intake
Company 23 ebcs

My biggest concerns are in the timing department

Let me know what you guys think!


Attachments:
2.5_Stage2_WRX.zip [84.28 KiB]
Downloaded 55 times
Top
 Profile  
 
 Post subject: Re: '04 WRX 2.5 NON HYBRID SWAP STAGE 2
PostPosted: Mon Nov 13, 2023 3:50 pm 
Offline
Newbie

Joined: Sun May 23, 2021 6:24 pm
Posts: 8
Timing might be a little aggressive for a base map, but I would suggest to go out get some logs and see how it feels and if theres any knock.


Top
 Profile  
 
 Post subject: Re: '04 WRX 2.5 NON HYBRID SWAP STAGE 2
PostPosted: Tue Nov 21, 2023 10:06 am 
Offline
Newbie

Joined: Sun Nov 05, 2023 3:33 pm
Posts: 3
Well, I think I'm in a very unique situation, but let me know what you all think.

First off, the basemap was made using one of the pinned stock roms which had an identical ecu id to mine.

Car had connectivity issues due to the obd port being old and loose, but if held at a specific angle, it managed to connect and read the stock rom.

Even though it has the same ecu id, it couldn't identify which def it used and wouldn't let me read any values.
Since they were identical id's, I loaded the new map and wrote it onto the ecu which succeeded and fixed the unknown image issue.

Now keep in mind that this new map is for the 2.5 which I created from copying the fxt values and I am also a novice with modifying roms.

Some bonus bs with this car,
I had to delete the charcoal canister due to venting issues before the swap but it still would break up in lower rpm (I had a p0340 which I didn't fix before the swap which could be the reason).I would also have problems getting the car to start (I would prime the fuel pump a few times which helped). Lastly, I was previously on an AP map and it was throwing codes for being too lean and too rich.
All of this was prior to getting into OS tuning.

Things I changed during the swap process:
Complete evap system delete, (I turned off all evap codes as well).
New cam position sensor and cleaned the surface of the cam gear.
Aem afr sensor in the downstream port. (I turned off all codes for downstream) .
Pcv delete (Bridged the connector, didn't touch the codes) and ran the line to a catch can.
Fpd installed between fuel filter and rails (cause why not).


Alright, and finally the situation I'm in.

The car is turning over, it has enough battery, it's got air, should have fuel, and has spark.

HOWEVER

IT WILL NOT START!

If I prime the fuel pump a couple few times, it will sputter a bit while cranking. Otherwise, it just keeps cranking with nothing else.

There's also no cel

We can assume it isn't the motor (it was running perfect in the last car a month prior).
It could be fuel (maybe the actual vent line is clogged)
It could be the ignition timing

I'd like to add that I'm a novice tuner, but I know my way around the engine bay.

Any ideas?


Top
 Profile  
 
 Post subject: Re: '04 WRX 2.5 NON HYBRID SWAP STAGE 2
PostPosted: Sat Jul 19, 2025 2:14 am 
Offline
Newbie

Joined: Sun May 23, 2021 6:24 pm
Posts: 8
Sorry for the late reply. did you ever figure this out?


Top
 Profile  
 
 Post subject: Re: '04 WRX 2.5 NON HYBRID SWAP STAGE 2
PostPosted: Sat Jul 19, 2025 5:24 pm 
Offline
Newbie

Joined: Sun Nov 05, 2023 3:33 pm
Posts: 3
The map was probably fine. The barometric sensor was bad and the engine wasn't any good either


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
Style based on FI Subsilver by phpBBservice.nl