It is interesting to see the ECM demonstrating its open-loop mode side by side with its closed-loop control. I've found it equally engaging in seeing a Gnuplot in use for cars! I'd love to repeat the experiment with my 1.4GHz Windows XP *desktop*. (OK. I know I need a long cable for a start....). What data logging device did you use? Did you have any difficulty fine tuning the Gnuplot (for this project)? Any tips?