What is HDFX?
HDFX stands for "High Degree of Freedom Executive." It is a strategy that Ford has implemented to allow dynamic blending between a series of calibrated tables. You've likely seen these table sets (Table 01 – Table 15) in our software and wondered about their relationship to one another.
These tables are individually calibrated from Ford for the respective VCT (Variable Cam Timing) angle pair as defined by the pairing reference shown above. From left to right, these mapped pairs represent Table 01 – Table 15. These pairs will vary by vehicle. As camshaft angles change during engine operation the ECU creates a weighting factor for each of these tables. These weighting factors represent the percentage of how much of a table will be blended into the final calculation and can be viewed with the HDFX Table Weight 01-15, and OP monitors.
For example, if the engine was currently running -30°i, 11°e; we would likely be at a 50/50 blend of Table 08 and 09. Knowing which tables are being used at any given time is crucial to the calibration process!
The one exception to this strategy which occurs when the "Optimum Power" (OP) mode is active.
When conditions are met to activate VCT OP mode, the VCT angles will be reflective of their desired angle calibration settings. When not in OP mode, the ECU will attempt to run in Fuel Efficiency or other modes and will vary VCT angles to achieve the most desirable result.
Most of the vehicles which we support have by default disabled weighting for the OP tables. We highly recommend taking the time to adjust and verify the tables associated with each VCT mapped pair for best results. This can be done by using the VCT Manual Mode toggle, and setting the VCT Exhaust/Intake Target (Manual Mode) values to match a specific table pairing.