RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980s! Our experience, countless hours of in-house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability.

RENNtech tuning software for Mercedes offers significant gains in horsepower and torque across the vehicle's entire power band. By modifying ignition timing and throttle mapping, optimizing air-to-fuel ratios, increasing the engine's rev limiter and modifying boost mapping for turbo-charged vehicles, RENNtech performance software unleashes the true potential of your Mercedes.

With the proprietary RENNtech ECU Plus Upgrade the C205 - C 43 AMG Coupe/Cabriolet gains up to +25 HP and +42 LB-FT, based on power numbers measured by RENNtech. Please note that the Mercedes M276 engine performance when measured, obtains higher numbers than rated from factory. The maximum power number reached with the RENNtech ECU Plus Upgrade for the C205 - C 43 AMG Coupe/Cabriolet is 400 HP and 440 LB-FT.

Note:

• Mercedes M276 engine performance when measured, obtains higher numbers than rated from factory.
• Power gains are calculated with stock numbers measured by RENNtech
• Crank Performance Numbers are calculated with a 17% Drivetrain loss on 4MATIC vehicles.
• Our numbers will be dependend on conditions and fuel quality. 93+ Octane gasoline is mandatory with this Performance Package.
• Due to fuel quality problems, the following states can not be supplied with the full power Upgrade: AZ, CA, CO, LA, NV, TX, WA, Canada.

Performance Numbers Overview 

C 43 AMG Coupe/Cabriolet (C205 | M276 | 3.0L V6 BiTurbo) Stock Performance:

• Rated by Mercedes-Benz:        362 HP @ 5,500-6,000 RPM; 384 LB-FT @ 2,000-4,200 RPM
• Rated by RENNtech:                375 HP @ 5,600 RPM; 398 LB-FT @ 3,300-3,600 RPM
  • Mercedes M276 engine performance when measured, obtains higher power numbers than rated from factory.

C 43 AMG Coupe/Cabriolet (C205 | M276 | 3.0L V6 BiTurbo) Modified Performance:

• Rated by RENNtech:                400 HP @ 5,450 RPM; 440 LB-FT @ 3,250-3,600 RPM
  • Crank Performance Numbers are calculated with a 17% Drivetrain loss on 4MATIC vehicles.