When the AMG GT Black Series was launched, the 730 hp super sports car deposed the Mercedes-AMG GT 63 S 4Matic+ as the most powerful car in the AMG portfolio. The previous title-holder, a four-door motor with an elegant coupé roofline, boasts 639 hp – while the former AMG sports car superstar, the GT R, lags even further behind at 585 hp. Yet the engineers at Posaidon in Mülheim-Kärlich have remedied the situation with modifications of the highest level – in the truest sense of the word. They have given the most extreme level of their performance improvements for the four-door GT-series X 290 the name GT 63 RS 830+. The spec sheet includes a brutal 940 hp and incredible peak torque of 1,278 Nm – some 300 hp and 378 Nm more than the already potent series vehicle!
Unlocking figures of this magnitude in this 4.0-liter twin-turbo V8 naturally involved comprehensive and carefully considered changes to the hardware and software of the AMG drive system, based on required extensive and utterly precise development work. The Posaidon engineers replaced the two turbochargers in the M177 DE 40 AL engine with new ball-bearing performance turbochargers connected to an entirely new exhaust system, complete with new downpipes fitted with motorsport catalyzers. The eight-cylinder engine’s intake system, intercooling system and cylinder heads also enjoyed an equally extensive overhaul. The intake and exhaust ports have been expanded and flow-optimized. Posaidon also optimized the valve positions.
The additional water/methanol injection introduces thoroughbred motorsport technology to the RS 830+. This system, supplied by a tank integrated in the base of the trunk, allows significantly enhanced boost pressures without subjecting the motor to higher thermal load, successfully combining the maximum possible performance enhancements with dependable and enduring operation.
In order to squeeze everything possible from the new hardware, the developers at Posaidon made extensive optimizations in relation to the software programming of the control units for the engine (ECU), drive (TCU) and drivechain (CPC). Of course, these performance enhancements are reflected by impressive driving performance. Although the sprint from 0-100 km/h in just 2.8 seconds is eye-catching, anyone who knows their stuff will be even more impressed by the continued acceleration shown by the 2.1 ton all-wheel drive, which powers from 100 to 200 km/h in just 5.9 seconds! When it comes to the top speed unlocked by all the software optimizations, the Posaidon team have stated a reserved figure of “over 350 km/h”. By the way: While the 830+ version is for export only, Posaidon also offers tuning levels that are ever so slightly “tamer” – but come with TÜV approvals. In Germany, the official TÜV seal is available for vehicles with up to 830 hp and 1,100 hp.
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