Mercedes-Benz AMG ‘43’ models

New Mercedes-Benz SL-Class R232 and Mercedes-BenzC-Class W206 models revealed with high-tech four-cylinder firepower

Mercedes has unveiled its first four-cylinder SL since the W121 190SL, the AMG SL43. Sending its 376bhp and 354lb ft of torque to the rear wheels, this highly efficient roadster brings Formula 1 technology to the road in the form of an electric turbocharger – a world first for series production. Supported by a 48V system and a belt driven starter/generator (RSG) providing a boost of 14bhp, this new system is even better at cancelling out turbo lag at any speed than previous electric air compressor set ups. With this turbocharger spinning at up to 170,000rpm and the M139 in-line four linked to a nine-speed AMG MCT Speedshift transmission, entry level is a relative term: this SL can accelerate from 0-62mph in just 4.9 seconds.

With the optional aerodynamics package comprising front bumper flics, a large rear diffuser and a steeper rear spoiler, the SL43 can be specced with an even more purposeful stance.

Lighter up front, with special software for sharp shifting, plus a fuel-saving gliding mode and a Race Start launch control function, the SL43 is expected to be a symphony of efficiency and agility. With a price expected to significantly undercut the SL55’s (£147,475), the SL43 is an intriguing alternative to the V8s.

AMG C43

The covers have also been pulled from the new the AMG C43. Available in Saloon and Estate forms, it’s equipped with the same F1 technology as the SL. It is powered by the same electrified M139 in-line four-cylinder as the SL but the engine is longitudinally installed and output is even higher: 402bhp and 369lb ft torque, with that electric turbocharger able to spin even faster, up to 175,000rpm. As a result, it is the world’s most powerful four-cylinder production engine right now; 62mph is seen off in 4.6 seconds and the top speed is 155mph, or (optionally) 165mph.

Four-wheel steering, a rear-biased 4Matic system and Race Start functions ensure the C43 delivers a lively drive. Three-stage ESP and AMG dynamic select programs offer further personalisation. An AMG Sound package, generating a synthesised exhaust note through the sound system, can be specified. Prices are TBC, but an AMG C63 equipped with the same M139 engine as part of a potent plug-in hybrid system is on the way.

Oval exhausts; hyper blue paint is spellbinding