500/550 V8 BiTurbo Engine M278


The direct-injection V8 BiTurbo engine M278 with 4.7 liters fitted in the S and CL class with increased power to factory 435 HP, and in the facelift models of the 2012 CLS, E, SL and ML class with its factory 408 HP, is the perfect technological foundation in order to gain sufficient more power.


We mainly have discovered free space in the engine electronics to go in both factory variants to just above the 500 hp. This Loewenstein torque curve is the dream of most Mercedes enthusiasts who seek for joyful additional outperform.



Option 1: Loewenstein LM50S-505

Consisting of modified ECU and Vmax uprating to 300 km/h

505 HP and 780 Nm (575 lb-ft) of torque



Learn more next about all related Loewenstein articles:


  • 500/550 BiTurbo remapping



Supported platforms:


  • CLS500/550 BlueEfficiency (C218) from 2011 to present
  • E500/550 BlueEfficiency (W212) Sedan and (S212) Estate from 2011 to present
  • ML500/550 BlueEfficiency (W166) from 2012 to present
  • GL500/550 (X166) from 2012 to present
  • CL500/550 BlueEfficiency (C216) from 2010 to present
  • S500/550 BlueEfficiency (W221) from 2011 to 2013
  • SL500/550 BlueEfficiency (231) from 2012 to present

All listed performance figures are approximate values. They depend on vehicle-specific details such as the vehicle type, equipment, tare weight, rear-axle ratio, wheel-tyre combinations, transmission type and aerodynamic equipment of the specific car. Figures about performance increases and/or performance kits are to be understood as average values. Test-dependent divergences of +/- 5% are possible. Figures about the overall performance of changed factory engines through performance increases and/or performance kits are based on the manufacturer´s data listed in the vehicle regristration document. They can vary by +/- 5%. LOEWENSTEIN does not warrant any further reduced performance of factory engines. Specifications are subject to change without prior notice.