0RPM is the slowest I can get it to rotate.
Now then... I have been able to get them to spin very slowly, but I don't know the specific RPM. It all really depends on the motor and how broken in it is, or if it has any bad sleeves/bearings or whatever it has. When I was just learning C, I would bump up the PWM value from 127 until the motor would start to turn with the 884 and the IFI controller. I know the minimum throttle for the 884 is 3%, I'm unsure what it is with the Jaguar, but I doubt the CIM will turn with a 3% throttle anyway.
I probably haven't helped you a bit, but I figured I would give you as much information as I could.