How to use Map Compare in Power Core
The Map Compare feature is indispensable when building new tunes or returning to previous work. Map Compare can be used to check for differences between stock and tuned vehicles, individual features when combining elements from multiple tunes, or to check progress when creating the next revision in an existing series of tunes.
To utilize Map Compare, you’ll need to open at least one file (but for our example, we’ll open two – a DJT and an STK file) in C3.
Once the files have been opened, use the ribbon at the top of the C3 form to navigate to the “Compare” tab. Click the “Compare Tunes” button to begin the compare process.
Select Files and Tables
The comparison configuration dialog will be shown – this dialog allows us to pick which files to compare against each other, as well as to customize which tables will be compared. Note that because we only have two files open, the chooser automatically pre-populates each file to the left (base) and right (compare) slots. The left (base) file will be selected based upon which file was selected in the document explorer when the “Compare Tunes” button was clicked.
Note: you may compare the same file to itself and then customize the table associations in order to compare corresponding tables to each other. (For example, we could compare Cylinder 1 Volumetric Efficiency with Cylinder 2 Volumetric Efficiency).
Next, click on the “Advanced Table Setup” tab to view table associations, then expand a folder.
Provided maps contain similar elements, tables will automatically be associated for comparison. Note that the “Left Table” column and the “Right Table” columns both contain the same name in this case, because both files are of the same tune compatibility.
In situations where the tables are either not matched up correctly or customization is desired, you may drag-and-drop tables from the right-most column to the “Right Table” column in the center to manually set associations.
Once you’ve set all desired associations, click the “Compare” button at the bottom of the dialog.
Viewing the Comparison
Now that our comparison is set up and initiated, we can take advantage of a number of features to quickly gauge the differences between the two files.
Take a moment to familiarize yourself with the comparison tree view and Document Explorer. A third document has been added to the Document Explorer – this is our comparison document. We can switch back and forth between the comparison and the left(base)/right(compare) files as needed.
Also note that any items that have been changed will appear bold in the tree view.
Note: If an item appears bold in the tree but changes are not immediately obvious in the table, check that the table axes are the same – comparison shows changes between the X and Y axis of each table as well as the data.
After clicking on one of the bolded tables in the tree (if any are present), note the changes and coloration. The darker a cell, the greater the change.
The numbers in each cell are calculated by subtracting the corresponding cell in the right document from the left document. (Diff = left – right). If the right document is 14.5, and the left document is 14.7, the corresponding cell in the compare document would be 0.2.
Clicking the checkbox at the top, left-hand corner of the comparison table will activate percentage mode - changes will be displayed as the percentage difference from left/base. (right divided by left times 100%). Cells in green are positive differences, eg, they are larger in the left document than they are in the right document, vice versa for red cells.
At any time, we may directly edit the comparison document to force changes to the left/base document relative to the comparison document. In value mode (percentage mode turned off), setting a 10 in a cell would cause the same cell in the left/base document to be set to the value of the right document plus ten.
Compare has full support for Undo and Redo, via the right-click context menu or Ctrl+Z and Ctrl+Y, respectively.
Pro Tip: Set an entire map compare table to 0 to copy all changes verbatim to the left-hand (base) document.