Mack Econodyne AC - 400 - 12.0 405hp Remap

The Mack Econodyne AC - 400 - 12.0 405hp is a turbocharged diesel engine producing 405 BHP and 1979 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 480 BHP and 2370 Nm — a gain of around 75 BHP (19%) and 391 Nm (20%).

This engine has moderate remap suitability, with a balanced spread of gains across both power and torque — providing a noticeable improvement across the rev range. The tuning headroom is classified as moderate, based on the percentage gain available from the factory output.

Considerations: High tuned torque: check transmission torque capacity and service history.

Fuel economy note: possible improvement with conservative driving.

All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.