ECU Setup

Flex fuel setup

Configure the flex-fuel sensor input first, then calibrate the fuel correction and ignition correction.

1. Input Setup

Assign the flex-fuel sensor to the appropriate ECU frequency input in ECU Configuration → Inputs Configuration. Confirm that the ECU is receiving the flex-fuel sensor signal before applying fuel or ignition corrections.

Input Setup — the supplied example assigns Cam Input 4 Configuration as Flex Fuel Sensor.

2. Fuel Correction

Open the fuel-correction map used for flex-fuel compensation and calibrate the fuel multiplier against the flex-fuel value. The complete supplied calibration screen is shown below so that the map, breakpoints, live values and relevant SXTune page location are retained with the guide.

Fuel Correction — supplied flex-fuel correction calibration screen. — Fuel Correction — flex-fuel correction calibration screen.

Fuel quantity strategy. The Delta 900 function description also notes that flex-fuel applications require the appropriate additional fuel multipliers for cranking and after-start fuelling; warmed-up fuel correction alone does not cover those phases.

3. Ignition Correction

Open the flex-fuel ignition-correction map and calibrate the spark-advance offset against flex-fuel content. Keep the correction consistent with the validated base ignition calibration for the fuels and alcohol-content range being used.

Ignition Correction — supplied flex-fuel ignition-correction calibration screen. — Ignition Correction — flex-fuel ignition-correction calibration screen.