Posaidon’s 217mph Mercedes-AMG E63 RS is faster than a Porsche 918 Spyder

Three new Posaidon power upgrades are now available for Mercedes-AMG’s E63 S, bringing hypercar numbers to the four door supersaloon

It was the introduction of all-wheel drive that helped supersaloons like the new Mercedes-AMG E63 go from a muscle car to something with far greater on-road capability, with the latest generation offering supercar performance in a luxurious four door package. This is something Germany-based Posaidon tuning has now capitalised on, pushing the Merc’s AMG V8 even further to produce performance figures usually reserved for seven-figure hypercars.

To do this, Posaidon has revealed three new tuning packages for the current E63 S, starting  at the bottom of the range with the ‘RS 830’ package, boosting power from the the E63 S’s 4-litre twin-turbocharged V8 to 819bhp and 811lb ft of torque through the use of upgraded turbochargers, a sports air filter and a less restrictive exhaust system with new downpipes and a new catalytic converter. The engine, transmission and central powertrain control units are also given software tweaks to ensure the new hardware works in harmony with existing components.

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Though it’s the least extreme package on offer, this boosts output by a substantial 216bhp and 184lb ft of torque, dropping the 0-62mph sprint by two tenths to 3.2sec and lifting the top speed to a claimed 217mph – the same as the Ferrari LaFerrari...

Next up is the RS 830+ pack, adding larger ball bearing turbochargers to the mix alongside the modifications of the base-level package. Peak figures in this case are rated at 868bhp and 885lb ft of torque, increases of 265bhp and 258lb ft over the standard car – the 0-62mph sprint drops a tenth lower to 3.1sec.

But there’s still one more to go, as Posaidon’s flagship upgrade package focuses on modifying engine internals to cope with the stresses of even more power. Modified cylinder heads, valve seats and water/methanol injection are now added alongside hardware of the lesser kits, boosting output to 927bhp and a 944lb ft of torque. The result is a claimed ‘sub’ 3sec 0-62mph time and 217mph top speed.

It must be said that these figures have not been substantiated independently, and it’s also worth remembering elements like the standard 9G AMG Speedshift transmission is torque-rated to 664lb ft in standard cars, making the 280lb ft jump in the most potent package likely require more than a software update to cope in the long term, but for now we’ll give them the benefit of the doubt.

Less invasive modifications are also available, with Posaidon’s piggyback ‘PowerBox’ module said to increase output by 94bhp and 111lb ft without the need for any hardware changes.


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