Lotus EFI

 

Tuning

For those that have the EFI Data Logging module.  Here is a basic procedure for using the learning capabilities of the data logging module to optimize your fuel map based on real world driving.    EFI Technology - Engine Control Systems - 1.2 ECU

Step 1

Connect your Laptop/computer to EFi and load Power to Win software and ensure you’re communicating with the EFi unit.  Backup your MAP(s) - you can find these in \Power to Win\Maps folder.

REQUIREMENTS:


  1. Bullet  Power to Win 7.1.7 software

  2. Bullet  RS232 to USB Cable connected to EFi unit

  3. Bullet  EFi with Data logging module

Step 2

Power to Win:


Check and/or edit the Lambda Setpoint Table -- Kris Valdez at DRS (Welcome to DRS) has defined this table based on his experience with best Air/Fuel ratios.  This is not a fixed table and you are free to adjust based on what AFR you would prefer at the given loads.  Load is in hg and AFR values are in Lambda -- I have created a quick reference conversion table EFI Conversions that can be used to convert hg to PSI and Lambda values to Air/fuel ratios.

Step 3

Power to Win:


Clear the current Lambda Table - Tools | Clear Lambda Table

Step 4

Drive.  Go drive the car as best as you see fit (track situation is best, but hard street driving is also good).

Step 5

Power to Win:


You want to read the new Lambda Table that would have been created from your driving in Step 4.  Tools | Read Lambda Table.

Step 6

Power to Win:


Now you want to open the Lambda Table so that you can apply all or parts of the table to your existing fuel map.

Step 7

Power to Win:


Now you want to open the Lambda Table so that you can apply all or parts of the table to your existing fuel map.

Step 8

Power to Win:


Select the range (load/rpm) using the MOUSE (keyboard arrow key selection did not work for me so be sure to use the mouse to select cells).  After selection, release mouse button and a popup menu will appear.  Select Apply Table and the values in the selection will be applied to the same corresponding values in your existing fuel map.  Values in this table are multiple by the values in your fuel map, so a value of 1.0 in this table means “no change” to your fuel map.  A value less than 1.0 means fuel is being taken out, a value greater than 1.0 means fuel is being added.

Step 9

Power to Win:


Save your map.

WARNING: I am not responsible for any damages and/or issues that may result in modifications to your tuning efforts as a result of using this procedure/process.  Proceed at YOUR OWN RISK.