SXTune Documentation

Calibration & Control

Fuel pressure control

Use the ECU-specific fuel-pressure pages for target pressure, pump base duty and closed-loop correction.

Overview

Fuel-pressure functionality differs between ECU applications. Available maps and variables depend on the selected ECU and configuration.

Calibration approach

Where the ECU provides closed-loop fuel-pressure control, establish the hardware configuration and a sensible base pump command first, then configure the requested pressure and finally the proportional/integral correction. Confirm pressure-sensor scaling and actual fuel pressure before increasing control authority.

Fuel Rail Pressure Control pages

The screenshots below show the complete calibration set supplied for this guide: open-loop/base duty, target pressure, integral gain, proportional gain and the live controller variables.

Fuel Rail Pressure Base Duty Cycle map.
Fuel Rail Pressure Base Duty Cycle map.
Fuel Rail Pressure Target map.
Fuel Rail Pressure Target map.
Fuel Rail Pressure Integral Gain map.
Fuel Rail Pressure Integral Gain map.
Fuel Rail Pressure Proportional Gain map.
Fuel Rail Pressure Proportional Gain map.
Fuel Rail Pressure Control variables and live status.
Fuel Rail Pressure Control variables and live status.