Our challenge was to elevate an already formidable super saloon into the realm of supercars—not just in outright performance but also in acoustic presence, all while preserving the drivability and comfort befitting an executive saloon. Our strategy focused on building upon the robust foundations of the C8 platform, enhancing its capabilities through precise engineering and persistent development.

The key to achieving this transformation was the integration of performance upgrades and tailored levels of tuning calibration. This ensured that the modifications not only enhanced power and responsiveness but also maintained the vehicle’s luxury and usability. The ultimate goal was to transform the Audi RS 6 into the pinnacle of what it could have been from the factory, crafting a seamless blend of high performance and refined drivability. We leveraged connections with Akrapovič, Garrett Motion, Eventuri, ITG, NickK as well as our in-house Nortech Performance to achieve these goals.

Our first step towards any transformation is to test the vehicle both on our in-house DynoJet 424x linked dyno cell and on the road. This evaluation serves to establish a baseline of the car’s performance capabilities and gives us a feel for what it wants to improve the driving experience. By assessing the vehicle under controlled conditions and real-world scenarios, we identified a few areas for improvement.

The air intake system, which was restricting the engine's ability to breathe freely; the intercooling system, which needed upgrading to better manage heat during sustained high performance; the exhaust system, which was too restrictive and muted the engine’s potential sound; and the factory gearbox calibration, which had conservative torque limits and shift strategies that could inhibit the engine's enhanced capabilities. Addressing these core areas was essential to transform the RS 6 into a supercar-rivalling machine while maintaining the sophistication of an executive saloon.

The engine ECU calibration was optimised to enhance the full potential of the upgraded components. Adjustments to fuel delivery ensured optimal rates for the increased air intake and exhaust flow, facilitating efficient combustion at higher power levels. Ignition timing was fine-tuned to align with the enhanced airflow and fuel mixture, maximising power output while preventing knock or pre-detonation, critical when running on 99RON fuel.

Modifications to the turbocharger's control software allowed for higher boost levels, significantly increasing power without exceeding the turbocharger’s or engine's safe operating limits. The torque output curves were recalibrated to provide a smoother power delivery across a broader rpm range, enhancing both performance and drivability. Additionally, an optimised cooling strategy was integrated to maintain ideal engine temperatures, ensuring performance remains consistent under various driving conditions.

Taking performance to the next level involves a few key upgrades, building on the foundations laid in previous stages. The next step includes the addition of larger turbochargers to replace the stock units, which are at their efficiency limit. The upgraded turbos feature larger compressor and turbine wheels, optimised for higher airflow and efficiency, essential for achieving higher power outputs. To support increased boost levels and ensure engine reliability, a water-methanol injection system can be implemented. This system is critical for reducing intake air temperatures, thus preventing detonation and allowing for more aggressive tuning. Additionally, the upgrade to 4-bar MAP sensors will ensure precise monitoring and management of increased intake pressures, essential for accurate tuning adjustments.

Depending intended usage, forged rods and pistons can be used to strengthen the engine for further reliability at high power levels. Further enhancements also focus on developing a more robust fuel system, capable of supporting the higher demands of upgraded turbos and tuning setups.