Stage 1 Fiat 500 1.3 JTD — Marelli MJ9DF 4F42B222 — Calibration File 55283475

• Initial Stage 1 calibration for Marelli MJ9DF (SW 4F42B222)
• Driver-wish, boost & injection maps revised
• Torque limiters adjusted for 6-speed manual gearbox
• Checksum integrity verified​

• Package includes Original + Stage 1 binaries
• Confirm ECU hardware 55283475 and software 4F42B222 before flashing
• Compatible with tools supporting Marelli MJ9DF controllers
• Designed for stock engine components and 6-speed manual gearbox; log key parameters after installation
• Intended solely for off-road or motorsport applications​