This is awsome and only if you are the most dedicated wrench head or a computer geek should you read any further. But this guy has published plans for a homemade dyno using a timing light spak plug clamp, a laptop computer, MATLAB and some old fashioned geek ingenuity. Basically he records some numbers from a pre-measured drive across the countryside, measures the “clicks” from the timing light clamp and puts three and seven together to develop the dyno curves. Absolutely fascinating stuff! Check out the DIY Dyno Page.