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2011-2014 Mercedes C218 CLS550 4.7L V8 BiTurbo RENNtech ECU Upgrade (ECU:54.218.CLS550BI)

Our 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.  Our 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.     Notes: 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 14% Drivetrain loss on RWD vehicles. Our numbers will be dependent on conditions and fuel quality. 91+ Octane gasoline is mandatory with this Performance Upgrade. States known for poor fuel quality have to be supplied with a lower power setup.     Performance Numbers Overview    CLS550 (C218 | PFL MY2012-14 | RWD | M157 | 4.7L V8 BiTurbo) Stock Performance (at crank): Rated by Mercedes-Benz:      402 HP @ 5,500rpm; 443 LB-FT @ 2,000-4,500rpm Rated by RENNtech:               435 HP @ 5,500rpm; 443 LB-FT @2,800-3,900rpm Note: Mercedes M278 engine performance when measured, obtains higher power numbers than rated from factory.      CLS550 (C218 | PFL MY2012-14 | RWD | M157 | 4.7L V8 BiTurbo) Modified Performance (at crank): Rated by RENNtech:               480 HP @ 5,500rpm; 605 LB-FT @ 3,700rpm                                                     413 whp @ 5,500rpm; 520 wtq @ 3,700rpm Crank Performance Numbers are calculated with a 14% Drivetrain loss on RWD vehicles.
Our 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 perf...
**VIN NOTE** RENNtech often requires your vehicle's VIN number to process orders. Please leave this information in a note during checkout or email us with your order number after order is placed*   RENNtech has become the premier Mercedes-Benz specialist and Hartmut Feyhl himself is regarded by many as USA’s foremost authority in Mercedes tuning. His vast experience comes from 12 years spent at AMG Germany before serving as the North American division’s Technical Director. Prior to the tuning company’s merger with Mercedes-Benz in 1999, by the request of AMG Germany, Feyhl branched out on his own to start RENNtech and service the existing AMG North America customers. Performance without compromise. This is the foundation upon which we have built our reputation. Established in 1989 by Hartmut Feyhl, RENNtech has evolved and grown from servicing AMG’s customers into the foremost authority on tuning and customizing AMGs and Mercedes-Benz. RENNtech also offers tuning solutions for Porsche, Audi and Bentley vehicles, along with other European luxury cars. Over the years, we have developed high-performance products for virtually all Mercedes-Benz AMG vehicles. Some of the most notable among these are the 200 mph RENNtech E7.4RS (which claimed ‘Fastest Sedan in the World’ honors by Car and Driver Magazine in 1996) and the more recent 945 LB-FT 5.5L V8 Biturbo RENNtech R3+ Monster. Each of these vehicles are just a sampling of what RENNtech has achieved, featuring extreme performance, upgraded aesthetics and a fit and finish that rivals factory vehicles. We design, engineer and manufacture our proprietary line of tuning products in-house at our facility which features a full fabrication and machine shop with CNC and rapid prototyping capabilities; in-house performance dynos, complete engine management and software tuning capabilities along with a complete service/repair/installation facility and a full-time design, engineering and sales staff. Our headquarter facility is located just north of the Palm Beaches in Stuart, Florida
**VIN NOTE** RENNtech often requires your vehicle's VIN number to process orders. Please leave this information in a note during checkout or email us with your order number after order is placed*   RENNtech has become the premier Mercedes-Benz...

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