whats the diff from the pc3
Reduced size from PCIIIusb (less than half of the size of PCIII)
USB powered from computer (9 volt adapter is no longer needed for programming)
2 position map switching function built in.
Gear input (allows for map adjustment based on gear and speed)
Analog input (allows user to install any 0-5 volt sensor and build an adjustment table based on its input such as boost or temperature)
With gear position input connected the PCV is capable of allowing each cylinder to be mapped individually and for each gear (for example: on a 4 cylinder bike with a six speed transmission there could be up to 24 separate fuel tables).
Unit has a -100/+250% fuel change range (up from -100/+100%). This allows more adjustment range for 8 injector sportbikes, in which you can control all 8 injectors.
10 throttle position columns (up from 9 on PCIIIusb)
Enhanced “accel pump” utility (increased adjustment and sensitivity ranges)
There are more throttle position cells on the Power Commander V than on the Power Commander III
You can specify a separate air:fuel ratio for EACH trim cell/each gear/each cylinder with the required equipment.
You've got a ton more ability for adjustment and precision tuning with pcv.