Mercedes-Benz M278 · 4.7-liter twin-turbo V8
Explore real SL550 examples from our in-house AWD Dynojet, then get a tuning quote for your M278-powered Mercedes-Benz.
Tuning & Pricing
We tailor the calibration to your vehicle, fuel and goals. Send us your year, model and current modifications so we can confirm compatibility and provide a written quote.
Dyno testing is quoted separately. Transmission tuning is $400 where available; support is confirmed for your specific vehicle.
Check My Vehicle & Get PricingThe M278 is the 4,663 cc twin-turbo V8 used in the SL550 and other Mercedes-Benz models below. Depending on the model and brochure, it is described as either 4.6 or 4.7 liters.
ECU calibration is available for supported applications, with in-house dyno testing to measure the results. We confirm your engine, ECU and software before recommending a tuning path.
Have an existing warning light, leak or drivability issue? Our Mercedes-Benz service and diagnostics can help address it before tuning.
Common M278 Applications
These U.S.-market models use the M278 twin-turbo V8. Years refer to model years, not the date the car was built.
| Model | U.S. model years | Chassis |
|---|---|---|
| SL550 Roadster | 2013–2020 | R231 |
| E550 Sedan | 2012–2014 | W212 |
| E550 Coupe / Cabriolet | 2012–2017 | C207 / A207 |
| CLS550 / CLS550 4MATIC | 2012–2018 | C218 |
| S550 / S550 4MATIC Sedan | 2012–2017 | W221 / W222 family |
| S550 4MATIC Coupe | 2015–2017 | C217 |
| S550 Cabriolet | 2017 | A217 |
| CL550 4MATIC | 2011–2014 | C216 |
| ML550 4MATIC | 2012–2014 | W166 |
| GL550 4MATIC | 2013–2016 | X166 |
This is an engine-family guide, not a guarantee of tuning compatibility. VIN, ECU identification and software version are checked before quoting. Older naturally aspirated 550 models, S550e hybrids and AMG 63 models use different engines and are not included here.
Not sure which engine you have? Send your year, model and VIN.
On the dyno
Video examples and measured graphs are separate libraries. A video does not identify the vehicle or setup in a particular graph.
Verified Vehicle Video
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Measured Example
Wheel horsepower and torque measured across two dyno pulls.
436.3 WHP511.6 lb-ft
493.9 WHP578.0 lb-ft
+57.7 WHP+66.5 lb-ft
Both curves use the same 2,200–5,900 RPM range and a shared vertical scale of 100–600 (not zero-based). Peak differences compare each run’s individual maximum, not gains at one shared RPM. Correction settings are not included in these exports.
Send your vehicle details, current modifications and goals. We will confirm ECU and transmission support and quote the tuning and dyno options for your car.
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