M278

Mercedes M278 Turbo V8

The M278 is a modern V8 power plant used across Mercedes’ higher-end, forced-induction non-AMG and AMG engines.
This page highlights compatible upgrades for M278-powered vehicles.

The M278 is a Mercedes 4.7 twin turbo that shares many similarities to the 5.5L AMG 157.  This engine can produce a great amount of torque with just a stage 1 tune.

Specs & History

  • Displacement: 4.7L to 5.5L variants with forced induction (depending on model) in later iterations
  • Usage: Found in high-end Mercedes models, both AMG and non-AMG depending on market and variant
  • Performance Role: Bridges the gap between inline-6 / V6 models and full V8 performance platforms
  • Engineering Focus: Blend of power, smoothness, and forced-induction response for luxury performance use

Performance & Upgrade Paths

  • Software calibration for boost, fueling, and torque shaping
  • Cooling / intercooler enhancements for thermal stability
  • Turbo upgrades / supercharger / forced-induction enhancements depending on variant
  • Fueling upgrades for ethanol or higher power maps
  • Exhaust systems to improve flow and response

Why Upgrade the M278?

  • Versatility: Many M278 variants exist — tuning them unlocks much of their hidden performance.
  • Thermal / Boost Balance: Supporting cooling and induction systems is key for reliable gains.
  • Platform Synergy: Matching turbo, cooling, fueling, and exhaust upgrades yields optimal results.

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