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Paul,
Basics are similar to the PC III. Same disabling of factory narrow band O2 sensors. But, in the case of the PC III, you either had to tune it seat of the pants or take your bike to a dyno and use an exhaust gas analyzer to determine A/F ratio as you manually calibrated the PC III or developed a new map for it which you could also install from another source. This functionality is built more or less into the new PC V. The PC V with autotune comes with a wide band O2 sensor. Note that bung size however is incompatible with the narrow band O2 sensors that are eliminated. So you will have to weld on a new larger I.D. bung to accomodate the autotune O2 sensor. How is works is, in autotune mode, the O2 sensor feeds back to the PC V and data logs A/F for different RPM points. When set to autotune, the PC V will automatically recalibrate A/F by adding or subtracting fuel to the injectors by evaluating the difference in A/F between current calibration and ideal calibration. A pretty sweet set up to avoid costly dyno time really with a noteable cavaet, you have to weld a new bung onto your EFI header. It has same open loop function however as a PC II or III and for that reason, some opt for the tuneboy which uses the input from the factory O2 sensors to adjust the map inside the ECM which also preserves closed loop factory functionality.
Hope that helps.
Last edited by Thruxboy; 11-06-2009 at 10:23 AM.
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Linear Mode
