Mercedes-Benz’s AMG performance division unveiled its new twin-turbo, direct-injection V-8 engine today in the S63 AMG Showcar, at its headquarters in rural Affalterbach, in the hills outside Stuttgart. The new V-8, code-named M157, is based on the existing 5.5-liter V-8 (M273) that’s widely available throughout the Mercedes lineup. It will make its debut this fall in the S63 AMG and in the all-new, next-generation CL coupe, presumably as the CL63 AMG. Yes, that’s right: the badging will remain S63 even though the displacement will be 5.5 liters. But, really, what does that matter? Even the current AMG V-8, the M156, is actually a 6.2-liter, not a 6.3-liter, so Mercedes is just continuing its illogical badging because it wants to evoke the glories of the historic 6.3 badge. Friedrich Eichler, head of powertrain development for AMG, explains that the new twin-turbo engine is actually rather conventional in design. Eichler elaborates on the many changes made to the base V-8 for this new AMG application: “We changed the crankcase and a lot of geometric parts.
Structural stiffness is improved, especially in the area where the crankshaft is rotating, where we made the ventilation holes smaller, for more rigidity. We have also made huge efforts toward mechanical efficiency, to reduce friction. We have roller finger followers and we have changed the pistons, the connecting rods, the diameter of the crankshaft, and the bearings. The result is an engine that exceeds the performance of the existing 6.2-liter AMG V-8 (not to mention the S600’s twin-turbocharged 5.5-liter V-12) while offering 25% better fuel efficiency. The M157 will be mated to an updated version of the MCT 7-speed automatic transmission that debuted two years ago on the SL63 AMG. It features a wet clutch rather than torque converter. The S63 will start in second gear, with upshifts as soon as possible, in a further quest to save fuel. A standard stop/start function will also help fuel economy. AMG’s performance estimates are 4.5 seconds to 60 mph with the standard engine and 4.4 seconds with the performance package; these figures represent 1.1 to 1.2 seconds quicker times than those currently achieved by the existing S63 AMG. The Mercedes-Benz AMG M157 twin-turbo direct-injection V-8 engine will, like all AMG engines, be built by a single mechanic at the Affalterbach facility by hand, following the AMG principle: one man, one engine. The S63 AMG Showcar pictured here is simply a means of showcasing the new twin-turbo V-8, says Tobias Moers, AMG’s head of product development. It also mimics the Mercedes 6.3 racing sedan that put AMG on the performance-car map back in 1971, right down to the red paint and the decals. Don’t expect the S63 AMG Showcar’s 325-section rear wheels on the production car, but Moers says that the 5-spoke wheels are accurate in style.
This is the new Mercedes S63 AMG, a 577bhp version of the new S-class. Can a combination of Merc’s self-proclaimed ‘best automobile in the world’ and AMG’s typical over-the-top exuberance produce a sports saloon to best the Jaguar XJR, Porsche Panamera Turbo and Audi S8? Read on for CAR’s first drive review of the new Mercedes S63 AMG. Which engine is in the Mercedes S63 AMG to produce 577bhp? It’s the same twin-turbo 5.5-litre V8 that was in the previous Mercedes S63 AMG, but here there’s another 41bhp and 74lb ft, taking the total outputs to 577bhp and 664lb ft. But if you’re worried about fuel consumed rather than power produced, then the S63 AMG is slightly less impressive. So the S63 AMG is essentially just an S-class with more power? Not quite. It’s 100kg lighter than the last S63, with half of those weight savings coming from the aluminium-intensive shell of the new S-class, and the other 50% from some AMG-specific tuning.
There are also lighter composite brakes (with ceramic-composite brakes an optional extra), AMG’s Ride Control two-mode adaptive dampers, AMG-tuned speed-sensitive steering, and a new S63-specific front axle. How does the new S63 AMG drive? Put the transmission into Sport or Manual, the dampers into Sport, and… it’s still not an out-and-out sports saloon. What’s the interior of the S63 like? It’s not faultless though. Some of the silver switches that you expect to be made of metal are actually plastic, and the column-mounted gear selector looks slightly incongruous as it’s pinched straight out of Mercedes’ cheapest car, the A-class. A four-wheel drive version of the S63 AMG is available, but as the 4Matic system isn’t currently compatible with the right-hand drive models, it’s not available in the UK. It’s an AMG-tuned, rear-biased version of Mercedes’ 4Matic system, and although it adds 70kg to the kerbweight, it cuts four-tenths from the 0-62mph time. And although the two-wheel drive S63 has far more traction than you’d ever expect when each rear tyre is dealing with as much torque as an A45 AMG can produce, the 4Matic system lets you get on the power sooner.
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