M278 ECU Tune

The Weistec M278 ECU Tune is a sophisticated engine control unit (ECU) upgrade designed for the bi-turbo M278 engine lineup, offering a significant performance enhancement. This ECU tune is the result of extensive, painstaking dyno and road tuning by Weistec Engineering, establishing itself as the most powerful ECU upgrade available for the M278 engine. It aims to optimize boost, fuel, and spark delivery to unlock the engine's full potential. This tune transforms stock M278 engines, achieving an astounding 540 horsepower and 715 ft-lbs of torque at the engine, even on vehicles running on California's 91 octane pump fuel. Key features include the elimination of the top speed limiter and increased throttle response for a more engaging driving experience. The ECU tune is CARB EO# D-691-1 exempt, making it street legal in all US states. This product represents a reflash of your original ECU. The tuning process can be completed using the Cypher handheld tuner. It's important to note that the Cypher handheld tuner is not compatible with 2020+ models. The vehicle application data indicates compatibility with Mercedes-Benz SL500 Roadster (R231) models from 2015 through 2020, all equipped with the Twin Turbo 4.7L V8 (M278) engine.