Four-cylinder Mercedes-AMG SL 43 unveiled

An entry-level model has joined the Mercedes-AMG SL line-up. Like the recently-revealed SL 55 4Matic+ and SL 63 4Matic+, the new SL 43 is a 2+2 roadster with a three-layer fabric retractable roof.

Power comes from a 2.0-litre four-cylinder petrol engine which features an innovative electric exhaust gas turbocharger. Drawing on technologies used in Formula 1, it incorporates a small 48-volt electric motor to spin the compressor wheel before the exhaust gases are able to deliver sufficient pressure.

Consequently, lag-free turbo boost is always available, even when applying the brakes. The claimed benefit is instant throttle response right across the rev range.

381 PS (375 bhp / 280 kW) arrives at 6,750 rpm, while 480 Nm (354 lb-ft) of peak torque is accessible between 3,250 and 5,000 rpm. In addition, a 48-volt belt-driven starter generator can provide an extra 14 PS (14 bhp / 10 kW) for short periods.

That output goes to the rear wheels via a nine-speed AMG Speedshift MCT (Multi-Clutch Transmission). In conjunction with a kerb weight of 1,810 kg (3,990 lb), the result is a 0-62 mph (100 km/h) time of 4.9 seconds, and an electronically-limited 170 mph (275 km/h) top speed.

Efficiency is probably as good as could be expected. WLTP combined cycle fuel efficiency and CO2 emissions are rated at 30.0 – 31.7 mpg (9.4 - 8.9 l/100 km) and 214 – 201 g/km respectively, for instance.

Pricing for the UK has yet to be announced, but prospective customers should be prepared to pay for some cost options.

Among the numerous items being offered are adaptive dampers, active rear-axle steering, an AMG Dynamic Plus Package (comprising a limited-slip rear differential, lowered suspension, upgraded engine mounts and a Race driving mode), and an Aerodynamics Package (including larger bumper flics, a bigger rear diffuser and a modified boot spoiler).

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