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Preserving Calibration When Changing Engine or Transmission Type

This article explains how to backup and restore calibration (settings) on a COMPUSHIFT Sport or COMPUSHIFT Pro controller when the engine or transmission type needs to be changed.


Whenever the engine or transmission type is changed on a COMPUSHIFT controller, new default parameters for calibration (settings) are automatically loaded. This means that any existing calibration is lost during the process. The reason for this is that not all engine / transmission combinations share the same calibration values or even have the same parameters. In most cases, restoring defaults is the right thing to do, but there are exceptions. One example would be that the engine type was set incorrectly, but parameters have already been set correctly for that engine.

For this reason, there is a procedure to save the calibration, change the engine or transmission type, and then restore the calibration.


These steps should only be followed while under the direct supervision of HGM personnel or its dealers.
Severe transmission or engine damage may result from changing engine or transmission type and / or loading saved parameters not intended for engine or transmission being controlled.

These steps assume that you have loaded the CS Setup app and have connected to your COMPUSHIFT controller.

  1. Go to the dashboard:

  2. Select the menu button (three small bars)

  3. Select “Save to File”. You will have to wait while all of the parameters are read from the controller. The progress bar will show 100% when the done.

  4. When done, the controller will prompt you to create a new file or save over an existing one. Choose “Create new file”, and when prompted enter a file name. For this example, we used “My CS Sport” as the filename.

  5. Go back to the dashboard and then navigate to the Vehicle Setup menu.

    and click the “Set Transmission/Engine Type” button.

  6. This will give you the opportunity to change the engine or transmission type. In this example, we change the engine from “Gasoline Engine w/sensors” to “Chrysler Hellcat CAN”

    when done, press the “Restart” button. The COMPUSHIFT controller will restart, and in a moment, the app will reconnect, bringing you back to the “Vehicle Setup” menu.

  7. Navigate back to the Dashboard, click the menu again.

  8. Click the “Load and Merge File” option in the menu, and you’ll be presented with a list of files. Choose the one you saved to earlier. In our example, we used “My CS Sport”

  9. The merge process will begin and show a progress bar.

  10. You will get a notice that warns you that the engine or transmission type do not match, and warn you of the consequences of loading parameters that don’t match the previous system. In this case here, we know that the change is safe, so we click “OK”.

  11. The system may warn if some parameters can not be merged or loaded. In our example, some of the missing parameters corresponding to the throttle position sensor calibration (as well as others are shown).

  12. Once you hit OK, the system will complete the change, and take you back to the Dashboard. A notice at the bottom will confirm that the load / merge succeeded.

  13. At this point, you are ready to test and drive carefully, confirming that the new parameters work properly with the changed engine or transmission type.

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