I?ve seen a lot of questions asking about VCT Distance Tables and how they work on the 2011+ Fords. The tables are located in Airflow > Variable Cam > Mapped Points and Distance tables. Knowing this information, you can adjust everything correctly, adjust spark tables and get your cam angles set up appropriately for when you reach Optimum Power load/pedal %
I'll be using Mapped Points > Fuel Economy as my example, but all the distance tables follow the same concept. This table works with IVO and EVC tables. You shouldn'/ NEED to adjust the IVO/EVC mapped point angles, but they can be changed. When you change the IVO/EVC mapped point angles, your spark will likely need to be changed due to too little or too much timing. When you change the VCT Economy DISTANCE Tables, your spark will also need to be changed, especially in the lower loads of the table. You will have knock retard!!
The Mapped Point assigns the IVO/EVC Angle, and the Distance table assigns the cell location by RPM and Load.
Attachment 78728
I have two stock calibrations with what appears to be different distance tables because calibration 1, axis 0, first cell is 0. The second calibration, axis 0 is set to mapped point 10.
Attachment 78734
The following picture is calibration 1, you will see IVO and EVC angles with the addition of one for example.
Below that is VCT Fuel Economy Mapped Points. This is the mapped point cam angle you will be assigning in Economy Mode. Axis 0 is calling for Mapped Point 0 (IVO - 0, EVC - 0) in the cam angles, axis 1 is calling for Mapped point 1 (IVO - 0, EVC - 10) in the cam angles, etc.
VCT Best Fuel Economy Distance is the main table for cam angles, spark tables, which everything will be called for.
VCT-Example-1.JPG
The next picure is calibration 2, it begins with mapped point 10 (IVO - -30, EVC 0) instead of mapped point 0. Next in line is is mapped point 0,then 1, in numerical order until mapped point 7..
Basically, the mapped point table is telling your distance table
0 = 10
1 = 0
2 = 1
3 = 2
4 = 3
VCT-Example-2.JPG
Comparing the two, they are off by one across the whole table. These two cars will drive exactly the same until 4500 RPM low load, decelerating, letting the vehicle down rev. Calibration two will be in mapped point 10 with IVO -30/ EVC 0, calibration one will have IVO 0/EVC 0 as "0 = 0"
comparingthe2.JPG
These tables can be adjusted for optimum power and for fuel economy. You can adjust the distance tables for your Optimum Power cam angles. You will build up load faster, get to Optimum Power faster and have the cam angles at the correct angle before you are in Optimum Power.
Looking at the distance table for 1500 RPM/20% load, there is a "2" in the cell. Look at your VCT Fuel Economy Mapped Points, we have a 2 = 2. Requesting for mapped point 2, IVO - 0 and EVC - 20.
mapped_point_2.jpg
At 3000 RPM, the cell has 2.5 from 20% load. 2.5 is calling for a split between the cam angles you have set on the Fuel Economy Mapped Points. In this case, the IVO is the at the same resting degree for both mapped points 2 and 3. The EVC on mapped point 2 is 20, and mapped point 3 is 30. Now we split the .5 and our EVC angle for 2.5 is 25 degrees.
mapped_point_2.5.jpg
The cells that are calling for 5.5 will split the angles in mapped point 5 and 6.
Mapped point 5 ----- -10 30
Mapped point 6 ------ -20 40
Our cam angles will be IVO -15 and EVC 35.
mapped_point_5.5.jpg
I made an excel file and took a picture to help those that don't understand distance tables and decimals.
mapped_point_excel=1.JPG
I've hit the picture limit. I will post more examples of getting my cam angles set up for OP, fuel economy and how to adjust the spark tables,
I've been able to get 27MPG on my s197.
The 2015+ Mustangs are able to achieve 30+ MPG STOCK, so there is still room for improvement. They are a little more difficult to set up for OP because of the new phasers Ford added to the s550's that will allow -20 max IVO advance, (not sure of the max retard of the IVO) I know the IVO can retard 30 or 40 degrees so if your IVO is at 30 and your EVC is at 40, you will have to advance IVO 40 or 50 degrees very fast when getting your distance tables set up for OP. It is possible to do for sure.
Hopefully this post will help some get a little better understanding of the distance tables.
Small up date in more recent posts.