In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Frame wrote:

Markistuff,

To get the proper data to program the EEC many hours are spent on the dyno going through a process call Engine Mapping.  This is where at each speed load condition all possible parameters are swept though there full range, eg. spark is swept from full retard to full advance.  One of the main parameters measured during this process is fuel flow, so we can plot fuel flow vs spark advance, this determines the optimum spark setting for each speed load condition (the A/F is held constant at Stoich for part throttle and around 12:1 for WOT or is EGT limited).  The Mapping process takes about a month, 2 shifts a day 6 days a week.  I am over simplifing this process but I think you get the idea.

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