I'm obviously new to this forum, and I'm not here because my jeep is boosted (it's not). I came here because i see some fair amounts of intelligence and inquisitive minds in the PCM tuning threads I've read. I've got a '94 Jeep Cherokee 4.0l 2WD w/AX15 trans. Just a few small mods like cold air intake, free flowing muffler, and 24lb 2nd gen bosch 4 hole injectors. I've stopped there because i feel the stock tuning isn't quite cutting it anymore and if i go further, i will see no gains due to lack of tuning. I've got 20-22mpg average. I'm shooting for more power and better mpg by way of PCM adjustments and underbody aerodynamic modifications.
The tuning information I'm searching for doesn't seem to be available on any Jeep forums. I have been doing lots of research on getting into the PCM's on these vehicles. As i understand, the SMEC and SBEC (I/II/III) from my jeep (SBEC II) and from most other Mopars of similar era are basically the same. I haven't gained much ground in interfacing with the PCM yet. I'm just starting with trying to get a basic connection to the PCM, and start to get responses. Then on to live data and tuning. I do know the baud is 7812.5 and 62.5k depending on what you're doing. I've started by purchasing an external serial-usb adapter so i can use my laptop in the vehicle. I know i'm dealing with SCI and that its a motorola setup, but thats all the real definite info i have. I also have a USB ELM327 for live data and DTC's and hopefully tuning some of my friends OBD-II cars.
I'm actually wanting to learn how the maps work and how to actually interface with the PCM down to the OBD commands, the AT commands, actual code, etc. I don't just want to go fast and want it now. I'm here to actually learn something.