I just got my Auterra OBDII Palm Scan tool attachment via UPS today. Basically it's a little plug/adapter that plugs in the the diagostic port and hooks into my little Palm Vx. If you want to read more on it go to
http://www.auterraweb.com Anyway, it can take readings from different sensors and graph them and what-not. Cool thing is that you can store the values into a DB, and export it into Excel. So I was ****ing around and made a graph (does tell you **** really, just testing it out in the little time I had today). Speed Vs. RPM Graph
I am gonna do some more runs tomorrow and see what I can find. You can do the following sensors (1995 240sx):
Calculated Load ValueEngine Coolant TempShort Term Fuel TrimLong Term Fuel TrimEngine RPMVehicle SpeedIgnition Timing AdvanceIntake Air TemperatureAir Flow Rate From MAFAbsolute Throttle PostionO2 Sensors (not sure how many yet)
It also reads DTC's and clears them. I figure I can make some money back off my friends that need the codes cleared =) hahahaha