A few months back, I was thinking seriously of getting rid of the computer on my little POS 97 kia, and Kiaracer clued me into the neatest thing since sliced bread - www dot megamanual dot com. It's the manual (for free! Can you believe it?) for an engine management system computer that a couple of weapons design engineers came up with (if I read the story right).
This computer uses just a few sensors - intake temperature, intake pressure, throttle position sensor, engine temp, O2 (just one that sniffs the exhaust coming out of the motor to fine tune the fuel - no sensor to test the catastrophic converter), and a crank or cam trigger (something that will sense RPM and engine position). That's it for mandatory sensors, and the O2, temperature and pressure sensors are GM stuff that is common and CHEAP! You can program the thing to use just about any sensor too! You can adjust the pulse of your injectors (be they high or low impedance) so it will work any injector you can think of. It has a trigger output for your ignition too! The kit to build your own computer is about $280 - WAY cheaper than any after market computer I've seen.
The only drawback I've seen with it so far is the massive amount of reading a guy has to do. I printed quite a bit of the megamanual off the web, and I have a 4" three ring binder with about 400 pages of info I'm about 70% done reading. It takes a lot of time and Anicin, but the TV sucks most of the time anyhow.
My big plan for my POS Kia is to put one of these computers on it and learn how to use the computer. I think the car will have far more value for me as an educational tool than it has as a mode of transportation.
Big thanks to Kiaracer for providing me with a new hobby (or obsession, as my wife calls it)
. It's a real process bringing my level of knowledge out of the stone ages, but I'll try to catch up!