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I'm a newbie here... Just ordered my Genboard & hoping to contribute to making new stuff. I have written a street dyno before (for old shape Impreza WRX) It was based on sampling RPM very quickly through the engine diagnostic port and time stamping the data... *If you know the gear ratios and tyre size you can work out a road speed for each data point. *You can then numerically differentiate the speed to get acceleration. *Then use F=ma to get force and thus estimate accelerating power. I'll dig out the rest of the equations later - air drag and so-on. The main problem was the quantization in RPM - this limited useful data points and made the answer very "noisy" at times. (Road speed has worse quantization in these cars!!) Other problems were accounting for clutch slip and wheelspin. (Not too bad to do) GPS would be nice. Also consider using G sensor from ABS system. Maybe we can talk to it over CANBus? Something to think about anyway... I suppose I'd better get the car to run first before starting to tune it!
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