The Open Ecu Thread!!!!WRX/STI/EVO

[RayArroyo]

I figured with the big open ecu trend going on we should start a thread to compile information which can help everyone that is interested in flashing their own ecu. I will start off by stating that Open Ecu is not for someone with minimal to no knowledge of tuning, and can cause catastrophic results such as a blown car or even an accident.

I will try to update this thread as much as possible and help out as best as i can. If anyone has any information to put up please do so. I will talk to troll about keping this thread moderated and any unusefull information will be deleted.


What you will need
Tactix ObdII Cable
Wideband
Knowledge of modern engine management system
Logger (usually available with the open ecu program of choice)

BEFORE YOU BEGIN MODIFYING YOUR FACTORY ECU!!!!!!


1. Download the factory map into your computer and save it in a safe spot. if you fail to do this you will never be able to go back. make sure once you save it do not save anyother maps under the same name as you will overwrite the map.

2. do a couple pulls and log the factory map, this will show you how your car is running and allows you to base your changes from there.

3. DO NOT Download any maps online and flash your ecu before verifying that the maps are safe 1st.

4. DO NOT flash any one elses map on to your ecu, or a map from a different year car wether is evo or scoobie, doing so will kill the ecu.


VERY IMPORTANT
The factory ecu uses afr targets to tune fuel, Just because you put a value of 11.5 on one of the cells does not mean thats going to be your afr, there is a varriance between the afr target and the factory 02 sensors. Once again wideband!!!!!

TIP: when starting, take your time and make changes in little increments, log and go back, also use a pen and paper to help you remember what changes you made where. Take your time!!! stay away from knock sensors, they are there for a reason.


If you feel uncomfortable doing so, please have someone with experince tune your car, what ever they will charge could save you thousands in the future.