Mercedes S550 Coupe Biturbo (2014on) – RENNtech ECU upgrade





RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980’s! Their experience, countless hours of in house research, development and exhaustive testing ensure that their 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 vehicles entire power band. By modifying ignition timing and throttle mapping, optimizing air/ fuel ratios, increasing the engines rev limiter and modifying boost mapping for turbo charged vehicles, RENNtech performance software unleashes your Mercedes true potential.


S 550 Coupé (C217 – M278 Biturbo Engine) Stock Performance:

  • 429 HP @ 5,250 RPM; 516 LB-FT @ 1,800 RPM
  • Note: Mercedes M278 engine performance when measured obtains higher numbers that rated from factory.


Modified Performance:

  •  530 HP @ 4900 RPM; 606 LB-FT @ 4100 RPM


*NOTE – We would need either the ECU or the vehicle bringing to our premises in Cheshire


Due to some of the products coming direct from RENNtech USA please allow 7-10 days for delivery

Prices may vary in accordance to the current exchange rate, please contact us for the current confirmed price

Our refunds policy can be found here