2021 Mercedes-Benz Posaidon S 63 RS 830+ - story fullscreen Fullscreen

2021 Mercedes-Benz Posaidon S 63 RS 830+

When too much power isn’t good enough, Posaidon has what it takes to give you more

LISTEN 01:44

The Mercedes-AMG S63 is no slouch with 612 horsepower and 664 pound-feet of torque, but what if that’s not enough? Well, according to famed tuner Posaidon, it’s not, and that’s why we’re looking at this tuned version of the S63 today. The same 4.0-liter V-8 lives under the hood, but it now features revised turbos with upgraded ball bearings, new air induction, and a revised exhaust system with new downpipes and sports catalytic converters. In the end, the Posaidon S 63 RS 830+ is good for a whopping 880 horsepower and 885 pound-feet of torque. That kind of power enables this S63 to hit 60 mph in 3.2 seconds and on to a top speed of 217 mph.

However, that’s not where the story ends. Posaidon has another upgrade in the works that will raise the final output to as much as 940 horsepower and 944 pound-feet of torque. Unfortunately, Posaidon hasn’t revealed straight-line performance figures for this upgrade, but it seems safe to speculate that 60 mph will come in around three-seconds flat. On that note, both of the upgrades we’ve discussed so far include physical upgrades, so if you’re not interested in that Posaidon can give you as much as 707 horsepower and 737 pound-feet of torque via simple recalibration of the car’s computer system. Rounding off the whole deal is an electronic lowering module for the AIRMATIC air suspension that will give the S63 a sportier right and more dynamic handling.

Alina Moore
Alina Moore
Alina Joined the Topspeed.com team in the early 2000s as one of the outlets very first experts, and she’s been with Topspeed.com ever since. Over the years, she’s served various roles, but today she’s is relied on heavily to verify automotive facts, assist with formatting, and discover new and engaging topics.  Read full bio
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The Mercedes S-Class is generally seen as a dignified, upscale luxury liner – a common chauffeured sedan of choice for executives and political leaders. And, although the AMG models feature a rather more striking character, it still wouldn’t be fair to expect them to match the performance values of a pure-bred super sports car. Yet, the AMG models can deliver exactly that – following an upgrade from the specialists at POSAIDON. The moment of realization is made all the more surprising by the fact that the upgrade involves almost no alterations to the vehicle’s appearance. The long-wheelbase S 63 4MATIC+ shown here is a prime example.

Following its facelift in 2017, the S 63 (W222) features the same 4.0-liter V8 twin-turbo (M177DE40AL) engine used in other series, combined with all-wheel drive and nine-speed automatic transmission. The AMG shown has been retrofitted to become an RS 830+, the happy medium of the three hardware-based upgrade levels offered by POSAIDON. Upgraded ball-bearing turbochargers, sports air filters and new downpipes with sports catalytic converters, plus corresponding software for the engine, transmission and powertrain (CPC) control units push its output up to 880 hp and maximum torque of 1,200 Nm. As a result, this hefty sedan makes the sprint from 0-100 km/h in just 3.2 seconds! Its maximum speed is limited to 350 km/h.

However, for customers looking for something even more powerful, POSAIDON also offers the top-level tuning variant for the M177 – also called RS 830+. In addition to the upgrades outlined above, this involves modifications to the cylinder heads and valve seats, plus installation of a water/methanol injection system. The result is some 940 hp and maximum torque of 1,280 Nm.

In the other direction, the entry-level upgrade – known as RS 830 – has received the blessing of the TÜV. The figure in the name represents its output, namely 830 hp, with maximum torque of 1,100 Nm. This boost is achieved with the help of upgrade turbochargers in combination with the sports air filters, downpipes fitted with sports catalytic converters and the optimized software for the three control units (engine, transmission and powertrain) used in the other upgrade levels.

POSAIDON also has a solution to hand for customers looking for performance upgrades without tinkering with their car’s hardware. Simply optimizing the three control units for the engine, transmission and powertrain yields a significant performance increase. In this case, these software adjustments alone can take the M177 to 707 hp and maximum torque of 1,000 Nm.

In addition to the upgrade to its V8 engine, the specimen shown here also benefits from a subtle visual refinement, namely an electronic lowering module for its AIRMATIC air suspension. This makes it possible to lower the body as desired to create a more dynamic look.

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