That's a lot of power for such a large SUV.

As if the Mercedes-AMG G63 weren’t impressive enough on its own, one tuning company has decided to beef up the SUV in a big way with an all-new powertrain. Posaidon tuning out of Germany has upgraded the G63 with more grunt, and some improved looks to boot.


Dubbed the Posaidon G63 RS 850, the upgrade SUV comes with plenty of boost. Under the hood the same 5.5-liter biturbo V8 from the factory remains, but in this application it produces a hefty 850 horsepower (633 kilowatts) and 995 pound-feet (1,350 Newton-meters) of torque, allowing for a 0-62 mph (100 kmh) time of just 3.6 seconds, and a top speed of 285 kmh (177 mph). The standard version produced a measly 571 hp (425 kW) and 560 lb-ft (760 Nm) of torque from the factory.

Gallery: Posaidon Mercedes-AMG G63 RS 850

All that newfound performance comes courtesy of a remapped ECU with upgraded internals to the seven-speed AMG Speedshift G-Tronic gearbox. The chassis has also been revamped, with new features like an adaptive damping system with three varying settings. New 10.5x22-inch alloy wheels comes wrapped in 285/40R22 high-performance tires, with gold-painted brake calipers borrowed from the S63 AMG positioned snugly behind them.

In the cabin, a unique contrasting yellow stitching and carbon fiber trim matches the exterior. The body is finished in a "Crazy Color Edition" Solar Beam Yellow, assuring it always stands out in a crowded parking lot, with black wheels and the aforementioned accenting gold brake calipers. Posaidon also offers its in-house speed camera update, which can be integrated seamlessly into the Comand online navigation system.

Posaidon Mercedes-AMG G63 RS 850
Posaidon Mercedes-AMG G63 RS 850

The shop doesn't say how much the upgrade will cost on top of the G63's standard price. From the factory, the base G63 asks $141,300, so expect to pay a pretty penny for this upgraded version. 

Source: Posaidon

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A car that accelerates to 100 km/h in just 3.6 seconds, with a 285 km/h top speed is normally a sports car or super saloon. However, when these numbers relate to 2.6 tons of big and bold Mercedes G-Class, people sit up and take notice.

With 571 hp and 760 Nm from its M157 bi-turbo V8 engine the standard G63 AMG on which POSAIDON base their G RS 850 conversion is certainly no wimp. However, the POSAIDON modifications of uprated intake and intercooling system, in-house upgraded turbochargers and stainless steel sport exhaust system with sound damper control and free-flow sport catalytic converters realize a power increase to 850 hp. Torque and top speed are electronically limited to 1,350 Nm and 285 km/h.

Optimisation with all the new hardware is carried out with bespoke remapping of the ECU protocols, and the AMG Speedshift Plus 7G-Tronic gearbox also receives uprated internals as well as a software remap to perfectly match the more powerful motor.

Such a significant power increase requires a commensurate improvement in chassis performance, and POSAIDON equips the G-chassis with an adaptive damping system featuring three possible settings.

Mechanical grip is enhanced with the fitment of 10.5x22-inch alloy wheels shod with 285/40R22 high performance tires. These black Y-spoke wheels present a stark contrast to the luminous AMG Solarbeam paintwork and the big gold painted brake calipers behind them. The S63 AMG high performance brake system adapted for life on the G RS 850 uses six-pot calipers clamping 420 mm carbon-ceramic discs in front, and 360 mm ceramic discs with four-pot calipers at the rear.

The special factory leather interior of this "Crazy Color" special edition G features contrasting yellow seams and carbon-fibre trim. POSAIDON also offers their in-house speed camera update, which integrates comfortably into the COMAND Online-System.