Power to Win

KB1031 - Basic Engine Mapping Guide

Mapping Guide

This guide outlines the basic procedures for mapping an engine on the dyno using the Power to Win software. Version 9.0 is a combined System Editor and Communications application that allows real-time editing of the current map in the ECU. When connected, any changes made to your maps are automatically sent to the ECU and will be in effect thus speeding up the mapping process. It is recommended that the closed loop control mode is used to expedite and simplify the mapping procedure. If your ECU is configured with an internal logger you can record your mapping session for later review.

When the ECU is first connected to your laptop the current map is automatically extracted from the ECU and loaded into the Editor. This process ensures that the map displayed in the file folder is an exact copy of the one in the ECU. After the synchronization process, any changes made in the Editor are then automatically sent to the ECU. The real-time editing can be disabled at any time by checking the Work Offline menu. When you have finished editing your current map it is recommended that you then save it to disk so you have a copy of your changes.

Before Starting

  1. Start the Editor with the ECU connected and make sure that the correct map is loaded.
  2. Clear any error codes using the Clear Diagnostics function.
  3. Make sure that the static crank trigger position matches the value set in the map.

    You can further verfiy the trigger position by checking the spark advance with a timing light and comparing it to the value in the map. Any discrepancy between these values is the amount the trigger position should adjusted. It is recommended to always move the trigger and not adjust the map so that calibrations can be transferred between engines without introducing timing errors.

  4. Clear the lambda table using the Clear Lambda function.
  5. Make sure that the throttle position sensor reads 10 deg. with the idle screw backed out and reads at least 85 deg. at wide open throttle.

    Setting the throttle sensor with the throttle blades fully closed ensures that if adjustment or replacement of the sensor becomes necessary a known datum position is defined. After locking down the sensor the throttle can then be opened to achieve the required idle setting.

Initial Start-up

  1. Start the engine and adjust the fuel to achieve a smooth idle.
  2. Check the ignition timing and make sure it matches the values in the map.
  3. If your system is configured to use lambda sensor(s) enable the closed loop at this time.
  4. Warm up the engine and check that all of the engine sensors are reading correctly.

Mapping Procedures

The general principal of mapping is to run the engine at each of the defined rpm and throttle sites, adjust the fuel and/or spark to the required values and then save these changes in the ECU. It is recommended that the Active Cursor option is enabled to track the position of the current cell. If this is a new engine configuration you can save time by initally mapping a few key sites such as 20, 30, 50 deg and full throttle and then using the interpolation function to fill in the remaining sites. Once a base map has been defined you can go back and fine tune entire map.

  1. Set the engine at the first rpm and throttle site that you want to map.
  2. Adjust the fuel using the global trim keys F8 and F9 to reach your target fuel numbers.

    The global trim value is displayed at the top of the current map window and can also be seen in the Control Panel" If you are using closed loop mode the global trims are adjusted automatically and require no user input.

  3. Press the Enter key to save the changes in the ECU.

    If you have selected any of the Copy Cell features from the Options Menu, you can use the F11 key to edit more cells at a time. Please refer to the Mapping Options section in the help file for further information on these features.

  4. Without moving the throttle move the engine to the next rpm site and repeat steps 2 and 3.
  5. When the last rpm point has been mapped move the throttle to the next site and start over.
  6. When you have mapped all of the sites save the new map to disk.

Closed Loop

The closed loop lambda control is a very useful mapping tool and once a base map has been established it can be used at the track to further fine tune your calibration. It is not recommened to use the lambda control on the track as a means to correct a poorly defined map. Corrections of greater than 5% indicate that you base map needs some further tuning and allowing adjustments greater than this can lead to oscillation, transient rich/lean conditions and poor throttle response. A little extra time spent tuning on the dyno ensures optimum tuning and best performance on the track.


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