C-ComWP has a built-in data logger feature that allows you to record various engine sensor data.  Up to 14 sensors can be logged simultaneously, and the log data can be saved for later viewing.  This log data can be retrieved by connecting a laptop computer inside the vehicle or by the use of the remote ECU Data Logger.

If you are using the remote ECU Data Logger, please read this section and then click here for specific information on installation, configuration, and use of the remote data logger.

Configuring C-Com WP's Data Logger

Before you begin logging, you should verify that the current dashboard selection and data logging parameters are properly configured.  This information can be accessed from the pulldown menus by selecting LOGGING/SETUP REAL-TIME LOGGING.  Select the number of frames per second at which to record, the maximum duration for which to log, the dashboard you wish to use for logging.  If you wish to use the auto-trigger feature, you may also select a sensor to trigger on and a threshold value at which to trigger.

While connected to an ECU and online, the data logging feature can be accessed through the pulldown menus by selecting LOGGING/ARM REAL TIME LOGGING.  You may also access the data logger by pressing the F8 key.

When the data logger screen appears, you will be prompted to press the SPACE bar to immediately begin logging or to press the ENTER key to arm the auto-trigger function.  Pressing the ENTER key will display a screen showing the current auto-trig sensor value and the threshold value for that sensor.  When the threshold value is exceeded, the data log will begin.

Reading the information in a data log

Once the data log is complete, a series of colored traces will appear in the data log window.  The colors of the traces will correspond to the colors of the text for each of the sensors in the dashboard.  There are several features in the data log viewer designed to make reading the data logs easier.

• Double-clicking on any sensor in the dashboard at the bottom of the window will hide the corresponding trace in the data log.  On logs with a large number of sensors, this helps reduce "clutter" and makes reading other sensors easier.  Double-clicking the sensor again will make the trace re-appear.  When the sensor is hidden, the colored text used to identify the sensor will be displayed in white, as shown above with the "N2O Stage" and "Spark (*BTDC)" sensors.
• By clicking on any location in the data log and dragging the mouse to the left or right, an area of the log will be highlighted in white, as shown above.  When you highlight a portion of the data log, the values listed in the dashboard sensors will be that sensor's average value within the highlighted area.
• Right-clicking on the data log will bring up another menu of commands, also shown above:
  • Replay will run the cursor in real time through the data log, starting from wherever the cursor is at the time this command is selected.
  • Zoom can be used to expand a highlighted portion of the data log to fill the entire window.  This is particularly helpful on long data logs where the information appears tightly packed together.
  • Filter Log Data allows the user to enter a number between 0 and 0.9 as a gain factor for how much filtering will be applied to the traces in the data log.  Filtering is a "smoothing effect" that will greatly reduce the sharp spikes often seen in data logs.  0.9 will apply the maximum amount of filtering, and 0.0 will return the log to its original unfiltered form.
  • Export Log Data allows you to save the log file information as either a plain text file (for viewing from Notepad or any word processing application) or a comma-delimited text file (for viewing from Microsoft Excel or similar spreadsheet application).
  • Load File allows you to load a previously saved log file into the data log viewer.
  • Save File allows you to save the current data log to a file which can be viewed at a later time.

Overlaying Log Data on a 3D Table

Data log files can be overlaid on the VE Table, the Spark Advance Table, or the Target Air/Fuel Ratio Table.  This allows you to step through the data log frame-by-frame to see which cells are being used within these tables at any given point and make any appropriate changes.  The tables can be edited while in overlay mode as well.

To overlay a log file:

• The log file must first be saved to disk.
  • For Alpha-N applications, you must have Scaled RPM and TPS% as two of the sensors being logged.
  • For Speed-Density applications, you must have Scaled RPM and MAP (kPa) as two of the sensors being logged.
• Open the 3D table(s) you will be using for the overlay.
  • If you are online, you must hide the dashboard display on the 3D table.  This can be done by right clicking on the 3D table window and selecting "Hide Dash".
  • If you are offline, you must first open the calibration file used when the data log was created.
• From the pulldown menu, select LOGGING/OPEN DATA LOG FILE and choose the log file to overlay.
• The data logger window will open.  As soon as you move the cursor in the data log window, the overlay will appear on the open 3D tables.  Moving the cursor in the data logger window will cause a corresponding movement of the cursor in the 3D tables.