Regarding the CAN bus interfacing to many EPAS units, vehicle speed is transmit over the CAN system. While there is no way (without a coding degree) to alter the assist vs speed you can alter the incoming message. The ECU I use for my fuel injection has user configurable CAN bus outputs. All I need to do is figure out what message the EPAS system is looking for and program the injection ECU to send it. If I dont like the assist curve I just alter the message to suit.
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