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Originally Posted by tpwalsh
On some stock ECUs you can do that. One that comes to mind is VW. All VWs in the OBDII era can be datalogged. See: Ross-Tech: VAG-COM I'm sure there are other products out there that are similar, ie scangauge already gets the data out of the blackbox, I'm sure that there's another product that will get that data into a computer to analyze.
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Vag-Com does that, but much more too, I can adjust injection timing and quantity adaptations on the fly with it, or change the EGR duty cycle, idle RPM, etc. It's pretty cool.