Option S3 8V 2.0 TFSI CJXC | Simos 18.1 SC800S5000000 Siemens | E85 Conversion File 8V0906259J

Change log

  • v1.0 — 2025-07-30
    • Initial release of the E85 Conversion file for the Audi S3 8V (Simos 18).
    • A comprehensive revision of all fuel and ignition systems for full ethanol compatibility.
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Release notes

  • v1.0 — 2025-07-30
    • Package includes Original + E85 Conversion binaries.
    • Confirm ECU number 8V0906259J and software SC800S5000000 before flashing.
    • IMPORTANT: Requires an upgraded High-Pressure Fuel Pump (HPFP) and the use of E85 fuel ONLY.
    • Using regular gasoline with this file may cause severe engine damage.
    • For off-road or competition use ONLY.​
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