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Jordan beta-tested the Toyota version, but he was vague on exactly how that system offloaded the data from the car (probably because it was still in beta). Judging by the literature from both Toyota and Nissan, an on-board computer handles the data conversion/synchronization from CANbus and on-board GPS to GT6-compatible data and puts it onto a USB drive plugged into the car. Nissan also says its system would relay data to a smartphone, I suspect via Bluetooth.Yes and no (oh, isn't that always the case?).
I don't know exactly how the Nissan and Toyota systems work, but my guess is it's a literal box that plugs into CANbus somehow - maybe even directly into the diagnostics port (CANbus is one of the standards in OBDII). The box would scavenge the data it needs and save it into the format that GT6 is set up to receive. I'd have to guess again on how you'd interface with the box, but USB seems sensible given that you can plug USB drives into the PS3.
So in theory, all someone would need to do to put it into any car made since 2001 (and post 1997 BMWs) is create the box. In practice... I have no idea
A couple of insurance companies here in the US do use data loggers hooked into the OBD-II port to monitor throttle and brake usage, so throttle/brake position and speed, as well as engine RPM, would be able to be read on all OBD-II/EOBD-equipped vehicles. However, I believe steering angle is only a recent addition to the data suite, when black boxes that record that data came into vogue in the late 2000's and then became required in the US as of last month. Since the black box can be read through the OBD-II port, I suspect that if the steering angle is part of the data suite, it can be read "live" through the port.
That would, if Polyphony wanted, allow for a "universal" real-world car data logger that would operate much as you describe, at least for many cars made since 2008. The trick, especially on vehicles without GPS, would be to synchronize that CANbus data to the GPS data. As others noted, without a high-rate GPS or a tightly-integrated tie-in between GPS and vehicle data, that could get "messy".