Very nice writeup. I am starting to consider the open source tuning approach. Currently, I am running with AP Stage 2 map and I love it but I am at a point where in order to move further in power, I will have to spend lots of money to move further. If I can do my own tuning, I can learn lots of things about my car and spend less. Sounds like lots of fun. Obviously, proper equipment is a must: wide band O2 sensor and gauge along with EGT gauge but I can start learning now.
So, here comes my first question:
Why can't I use the AP cable with serial->USB adapter to do the flashing? The cable obviously supports all proper voltages in order to do this and the tactrix cable is just a ODB2 serial cable with an integrated serial to USB converted. Has anybody actually tried it? I know there are different tactrix cable revisions which work with only certain model years so there might be more to it. Anybody?