Power Commander III
The Power Commander III was introduced in 2000 and is externally similar to the PCII. The PCIII utilizes "direct injector control" technology to control the fuel curve for models that do not possess the appropriate sensors to allow sufficient fuel adjustment using the PCII technology. The PCIII takes the injector pulse from the ECU and changes the pulse width signal to the injectors.
This unit allows "Fuel Only" adjustment.
Power Commander IIIr
The Power Commander IIIr was introduced in November 2000 and utilizes the same "direct injector control" technology as the PCIII.
The "r" version contains additional circuitry and in some cases, additional connectors, which allow Ignition adjustment as well as fuel adjustment. Ignition adjustments can provide very positive results on the race track, where factors like special fuel and highly tuned engines are used.
Power Commander IIIusb
The Power Commander IIIusb was introduced in 2003 and utilizes the same "direct injector control" technology as the PCIII. The USB (Universal Serial Bus) port provides an instant, no-hassle way to connect the Power Commander module to a computer. This model also features an expansion port for future add-on modules like an ignition module.