Cars · Electronics
OBD1 8-Bit Ignition Advance Formula
Ignition timing advance conversion formula for 8-bit OBD1 Honda ECUs.
Adapted from pgmfi.org wiki
In 8-bit OBD1 Honda ECUs, the ignition advance value (in degrees) is calculated from the raw table byte value v using the following formula:
Ignition Advance (Degrees) = (v - 24) / 4
Where:
vis the decimal representation of the byte at the ignition map cell.
Credits and source
Authors Anonymous PGMFI contributor
Source Adapted from OBD1 8bit Advance on pgmfi.org wiki. Licensed under CC BY-NC-SA 1.0.