I was told by the people at Dynojet/Power Commander that the PCIII does not, and can not, change settings below 20% throttle openings.
Which is why the PC III fuel maps for the stock ECU all have zeroes in them
for below 20% throttle (the "closed-loop" mode region). In the closed-loop
region, air:fuel mixture is monitored by the O2 sensor in the exhaust, which
feeds back a signal to the ECU to allow for continuous adjustment to some
target AFR (typically 14.7:1 for narrow-band O2 sensor equipped fuel injection).
This can be altered somewhat by an O2 manipulator. The transition to open-
loop mode is totally seamless and you will not feel anything happening on the
bike. Having a customizable fuel map via the PC III for the open-loop mode
allows you to optimize fueling (and therefore performance) with any mods you
add to the bike, and therefore maximize HP gains where you need it-- half- to
full-throttle. Meanwhile, the ECU self-adjusts to a fuel-efficient target AFR
for part throttle and low RPM operation. This set-up has worked flawlessly
for me, but there are a number of guys who swear by their DP ECU's; their
only drawback seems to be poor fuel mileage.
I've used Hyprduc's M732-003 map on my Hyper w/stock ECU/Zard exhaust/
DP airbox lid and it worked great. This map is one of four HM maps available for
down-load from Power Commander. Some vendors, like More Power Racing online,
will pre-load your PC III with a requested map before they ship it to you if
you desire it. You can download new maps anytime via the USB port on a
computer, or have custom dyno-tuning done at a shop, or modify fuel
richness on-the-fly using the three buttons on the PC III (resolution is
limited to low/med/high RPM ranges for these buttons, so they are a rather