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Core EFIV4 Manual

09 · Software

Firmware & TunerStudio

Core EFI loader for firmware, TunerStudio for the tune. Loaders and ini files live on the Race Shop support drive. Cylinder count, injection mode and pin functions are assignable in the project.

What runs on the box

V4 runs Core EFI firmware, tuned in TunerStudio. Use the Core EFI V4 loader from the Race Shop support page — not a binary from another Core EFI product.

Update via Auto DFU

  1. 01

    Talk USB first

    Windows Device Manager should show ‘STMicroelectronics Virtual COM Port’. If it does not, install the ST VCP driver before you try DFU.

  2. 02

    Auto DFU from the console

    Open the Core EFI console, pick the COM port, Update Firmware. The activity LED stops, the VCP disappears, ‘STM Device in DFU Mode’ appears, then erase + download.

  3. 03

    Power cycle

    When the console reports Upgrade successful / Verify successful, key-off, wait 10 seconds, key-on. Confirm the new version string.

TunerStudio project

  • New project → load the Core EFI V4 ini that shipped with that firmware.
  • Set cylinder count, injection mode (sequential / batch) and ignition mode (COP / wasted spark) to match the engine. 6-cyl fuel is 3-channel matched on Ign 4 / GPO 5 / GPO 6 — assign those as injector-driver outputs, not coils.
  • Assign spare analog and GP pins to the sensors and relays actually fitted.
  • Calibrate TPS, CLT, IAT, MAP, AFR before you crank.
  • Save the .msq off the laptop.