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M276 ECU Tune
Purchase M276 ECU Tune
  • SKU: 05-276-00055-0

    M276 ECU Tune

  • Advertised gains are estimates of HP and Torque “at the engine” calculated from gains as measured on a Dynojet Dynamometer in ideal conditions and typically show the largest possible change.  Actual gains are dependent on the following: Learn More about Crank HP Vs Wheel HP

    Model – Manufacturers use the same engine in multiple model vehicles and often times they are in a different state of tune, for example: 2008 C63 and a 2008 CLK Black Series.  Both have the same engine, but the C63 has 451hp while the CLK63 has 500hp.  Naturally the C63 will show more gains as it starts at a lower level.

    Model Year – Similar to above, as time progresses, Manufacturers tend to slightly increase power output via software from one year to the next or offer “Performance Packages” with increased power.  The engines remain largely unaltered and as a result, final tuned output remains the same, while the gains are lower as the starting point is now higher.

    Fuel – Fuel quality is HIGHLY important with performance vehicles.  Low quality and/or low octane fuel will greatly impact engine output and potentially even engine health.  Top tier brand premium fuels should always be used to achieve the best results possible.

    Drivetrain – All wheel drive has higher drivetrain losses than rear wheel drive.  This results in lower numbers when testing on a chassis dyno.  Wheel/tire size and weight will also impact chassis dyno results

    Weather/Conditions – Temperature, humidity, altitude, and air density all impact engine performance.  Heat, high humidity, and thin air will all work towards reducing engine output

    Engine Health – Higher miles tends to result in increased build up and lower compression which can and will impact engine output.  Properly maintained engines will have better performance than abused or neglected engines.

    Supporting modifications – The highest power levels require supporting modifications.  Depending on the engine, this could mean forged internals, built transmission, upgraded fuel system, 110+ octane race fuel, etc.

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  • Prop 65 warning

    This product can expose you to chemicals including carbon black, silica - crystalline, formaldehyde, and lead which are known to the State of California to cause cancer, and lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to

Weistec Horsepower 438
Weistec Torque 521
Manufacturer Weistec
Street legal in all the US States No
Engine Family M276
Stock Horsepower 328
See more
year make model trim engine
2018 Mercedes-Benz E400 Coupe (C238) Twin Turbo 3L V6 (M276)
2017 Mercedes-Benz E400 Coupe (C238) Twin Turbo 3L V6 (M276)
2016 Mercedes-Benz E400 Coupe (C238) Twin Turbo 3L V6 (M276)
2015 Mercedes-Benz E400 Coupe (C207) Twin Turbo 3L V6 (M276)
2014 Mercedes-Benz E400 Coupe (C207) Twin Turbo 3L V6 (M276)
2013 Mercedes-Benz E400 Coupe (C207) Twin Turbo 3L V6 (M276)
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Product Description

All 2020 models require bench flashing at this time.

ECU Tuning Process:How do I get my ECU tuned?


The Weistec M276 ECU upgrade for the 2015+ Twin Turbo or "BiTurbo" 3.0 Liter V6 engines provides substatial gains across the entire powerband.   From 2200 rpm to almost 4500 rpm, torque measured at the wheels is well over 400lb-ft on our in house linked 4WD Dynojet Dyno making the vehicle a blast to drive around in any situation

ECU Tuning Process: How do I get my ECU tuned?


  • Factory Power 320whp and 350wtq

  • Weistec ECU Tune Power 370whp and 440wtq on 91 octane*

  • Improved Throttle Response

  • Optimized Fuel, Spark, and Boost

  • Some models have speed limiter in CPC module requiring CPC upgrade to remove speed limiter.

*Power gains vary based on model, modifications, fuel, and running conditions.

Tuning Process: Cypher Handheld Tuner