Join Date: May 2004
Location: Toronto, Canada
New fuel delivery rate = Old fuel delivery rate x (New PC correction factor / Old PC correction factor)
For expression as an air/fuel ratio you have to flip this upside down
New air/fuel ratio = Old air/fuel ratio x (Old PC correction factor / New PC correction factor)
The correction factor is 1 + whatever the number in the cell is divided by 100
e.g. if you have "5" in a particular cell then the correction factor is 1.05, and if you have "-10" in a particular factor then the correction factor is 0.9
If you had air fuel ratio 12.0 originally with no power commander, and you apply "-10" in that cell, then effectively the old correction factor was 1, so the new air/fuel ratio will be 12.0 x (1.0 / 0.9) = 13.3...
All of this is making an assumption that the fuel injectors have a delivery rate that is linear with injector duration (it should be very close unless you have a restriction in the system somewhere) and that your air/fuel ratio meter is displaying accurately and you are not going outside of the range in which it displays correctly (which is not guaranteed ...)
Helibars, MRA screen, Ohlins damper, reversed shift pattern, sorted suspension, braided lines, Michelin Pilot Power, all else stock 'coz it's fast enough!