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.

Update:

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.