Description
Description:
RennTech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal. RennTech proprietary tuning module stores both the RennTech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU. Programming takes only a few minutes and the vehicle can be reflashed at any time as many times as you wish.
RennTech intermediate level ECU upgrade for the Mercedes M278 engine still offers huge gains in performance across the entire RPM range, but with a slightly reduced peak HP and torque from our standard tune. This is ideal for customers who want increased performance in their daily driver without worry of extra strain on driveline components or for areas and countries with extreme altitudes, temperatures or fuel quality concerns.
RennTech intermediate ECU tune increases performance from 402 HP and 443 lb/ft torque up to 480 HP and 605 lb/ft at the crank! This is a slight reduction from our standard tune but still offers white knuckle performance at one of the most affordable price points in the tuning market.
Attention:
We have found the M278 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz. We typically see higher baseline numbers than claimed by the factory
Power gains are calculated based on stock numbers measured by RennTech
Crank Performance Numbers are calculated with a 17% Drivetrain loss on 4MATIC vehicles
RennTech numbers will be dependent on conditions and fuel quality. 93+ Octane gasoline is mandatory with this Performance Upgrade.
States known for poor fuel quality have to be supplied with a lower power setup
Features:
- Gains up to +45HP / 162Lb-FT
- Long-lasting and driver reliability
- Significant gains in horsepower
- Increases the performance
- Significant gains torque
- Increasing the engine’s rev limiter
- Incredible performance gains
Stock Performance:
- 402 HP @ 5,500rpm; 443 LB-FT @ 2,000-4,500rpm
- 435 HP @ 5,500rpm; 443 LB-FT @2,800-3,900rpm
Modified Performance:
- 480 HP @ 5,500rpm; 605 LB-FT @ 3,700rpm
- 398whp @ 5,500rpm; 502wtq @ 3,700rpm
Performance Graph:
Vehicle Fitment:
- 2015 Mercedes-Benz C218 CLS550
- 2016 Mercedes-Benz C218 CLS550
- 2017 Mercedes-Benz C218 CLS550
- 2018 Mercedes-Benz C218 CLS550
- 2019 Mercedes-Benz C218 CLS550
Note:
Images are for representation purpose only and may differ depending on application.






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