02.04.2026
In this intervention, we focused on a Mercedes C200 W205 equipped with the OM651 engine, one of the most widespread engines in the group, also used on C220 and C250 CDI models. The goal was to optimize performance while maintaining reliability and consistency with the original management logic, with a significant operational margin on torque management.
Thanks to ECM Titanium, tuning was carried out with precision, working on engine management parameters to fully deliver the engine’s potential.
The first step involved unlocking torque limitations, raising the maximum value to 500 Nm.
This intervention generated most of the performance increase, considering that the ECU is already calibrated to operate at this level. Map analysis shows that modifications were mainly focused on torque tables, with minimal intervention on fuel management, limited to injection timing.
During testing phases, a critical issue emerged related to torque monitoring: under heavy acceleration, the ECU would intervene, putting the vehicle into protection mode.
To solve the issue, several tests were carried out:
The first solution showed non-optimal behavior: overly intrusive traction control and less responsive throttle.
The switch-based solution was therefore adopted, allowing:
Finally, the speed limiter was removed. Combined with the 9-speed 9G-Tronic automatic transmission, this allows the vehicle to exceed 250 km/h.
