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

Unlock the full potential of your Fiat 500 1.3 JTD with this professionally calibrated Stage 1 tuning file for the Marelli MJ9DF ECU. Specifically developed for software version 4F42B222, this file is the definitive solution for enhancing your vehicle's performance and driving dynamics. Our calibration focuses on optimizing key engine parameters, including fuel injection maps, turbocharger boost pressure, and torque limiters, delivering a significant and noticeable increase in horsepower and torque across the entire rev range.

You will experience sharper throttle response, smoother acceleration, and more flexible power delivery. Every modification has been carefully tested to ensure stability while retaining all factory safety features and diagnostic systems. This file is engineered for vehicles with stock engine components and the 6-speed manual gearbox, making it the perfect upgrade for drivers seeking a reliable way to make their Fiat 500 more responsive and enjoyable to drive without compromising engine longevity.