The Mercedes-AMG SL43 Is As Unusual As It Is Revolutionary

The SL43 ditches the standard V-8 present in different SL fashions for a four-cylinder and an electrical exhaust turbo – the primary of its form on a manufacturing automobile.

by Robert Moore, on

It’s been about six months since Mercedes revealed the all-new SL Roadster – a automobile that’s designed to make up for the mundane automobile that got here earlier than it with a variety of distinctive options and enhancements. A brand new AMG GT coupe is anticipated to reach as a sidekick to the SL, and an entry-level model of the SL has been rumored for months. Now, that automobile has arrived, and the rumors had been proper – it’s powered by a four-cylinder engine. This isn’t your typical four-cylinder engine, although, and it nonetheless boasts some spectacular energy due to intelligent engineering.

The 4-Cylinder Mercedes-AMG SL43

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Underneath that lengthy, glossy hood of the SL43 sits AMG’s turbocharged M139 2.0-liter inline-four. This engine may be very acquainted and is used broadly inside Merc’s lineup, however this particular engine is completely different, due to the spectacular use of F1 expertise. Whereas different variations of the M139 inline-four function your typical exhaust-driven turbocharger, the SL43 has an electrical exhaust gasoline turbocharger. That is the F1 tech I’ve been telling you about, and it’s powered by a 48-volt electrical system. The premise behind this electrical gasoline turbocharger is easy. The turbo’s turbine is spooled up by an electrical motor till the engine is up to the mark sufficient for the exhaust to take over. This primarily eliminates turbo lag altogether and, as Mercedes places it, permits the engine to supply “notably spontaneous throttle response throughout your complete rev vary.” It additionally helps to extend effectivity, so there’s that too.

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All informed, this engine is ready to put out 381 horsepower at 6,750 rpm and 354 pound-feet of torque as little as 3,250 rpm earlier than it begins to fizzle out at 5,000 rpm.

The starter-generator system throws in an additional 14 horsepower briefly bursts, so technically the SL43 is a light hybrid, even when it’s not being marketed as such. Energy is shipped completely to the rear wheels by way of a nine-speed MCT. The top outcome once you put the hammer down is a 0-62 mph dash in 4.9 seconds and a prime velocity of 171 mph.

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These are fairly spectacular numbers for one thing with a four-banger underneath the hood, and it speaks to the spectacular engineering of the SL and the M139 engine. We’re speaking about half the turbos, half the cylinders, and half the displacement, however the finish efficiency is way from halved. Exterior of this, Mercedes claims that the smaller engine’s decreased weight in comparison with the V-8 offers the SL43 distinctive and dynamic dealing with that’s completely completely different from the V-8 fashions. Lighter torsion bar stabilizers are additionally a part of the equation, which makes it appear to be AMG was attempting to make this the lighter, extra agile, driver’s automobile.

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As for the SL43’s look, you received’t see a lot that set it aside from its stablemates. The vents within the decrease entrance fascia are a bit completely different, whereas the rear bumper is new clean with none rear vents in any respect. Oval exhaust ideas are distinctive to the SL43 as are the compulsory SL43 badging. 19-inch wheels come normal however you may go for 20- or 21-inch models in order for you. That mentioned, the 43 doesn’t ditch a lot by way of options in comparison with the SL55 and SL63. It may possibly nonetheless be optioned with rear steering, quite a few drive modes, the Dynamic Plus Bundle, and let’s not neglect about the usual tech-laden cabin with a number of display screen actual property and the most recent MBUX system.

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As of now, there’s no phrase on pricing or availability, however Mercedes plans to launch this data nearer to the beginning of manufacturing.

Robert Moore

Robert Moore

Robert has been an auto fanatic his whole life. He began working vehicles at a younger age, studying the fundamentals from his father within the house storage on the weekends. As time went on, Robert turned an increasing number of keen on vehicles and satisfied his father to show him the best way to drive when he was simply 13 years previous. Robert continued engaged on vehicles in his free time and discovered as a lot as he may about engines, transmissions, and automobile electrical techniques, one thing that solely fed his curiosity extra and ultimately led him to earn a bachelors diploma in automotive expertise with a main give attention to engine efficiency and transmission rebuilding. Comply with @RobMoore839  Learn full bio

Concerning the writer

Patrick Moore

Patrick is our chief editor and he's very passionate about cars. He has a bachelor's degree in marketing and he studies journalism. His favorite brand is BMW and he drives an X5 series. When he's not writing for, he enjoys spending time with his family and 9 years old son.

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