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Audi RS Q e-tron saves over 60% CO2 at the 2023 Dakar Rally

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Audi RS Q e-tron saves over 60% CO2 at the 2023 Dakar Rally Audi RS Q e-tron saves over 60% CO2 at the 2023 Dakar Rally

Audi RS Q e-tron saves over 60% CO2 at the 2023 Dakar Rally

On its Dakar debut in January 2022, the Audi RS Q e-tron set standards for the efficiency and competitiveness of e-mobility in motorsport. Now the next step follows: The three desert prototypes with electric drive and energy converter will be at the start of the next edition of the Dakar Rally from December 31, 2022, to January 15, 2023, for the first time with an innovative fuel.
‘At Audi, we are pursuing a consistent strategy of decarbonization,’ says Oliver Hoffmann, Board Member for Technical Development at Audi. ‘Our battery vehicles and renewable electricity are the lead technologies. To complement this, renewable fuels offer the possibility of running internal combustion engines in a more climate-friendly way. The Audi RS Q e-tron combines both systems in its innovative drive. As a result, we are now even more sustainable on the road in the toughest motorsport imaginable for electric drives.”
Audi relies on residue-based products that do not compete with foodstuffs for the fuel used in the rally car to further reduce carbon dioxide emissions. Behind this is a process that converts biomass into ethanol in the first step. The final fuel is then produced in further process steps. The process is abbreviated to ethanol-to-gasoline (ETG). The process engineers use biogenic plant parts as the starting product. The tank content of the RS Q e-tron consists of 80% sustainable components, including ETG and e-methanol. This fuel is required by the energy converter, whose combustion engine part operates with high compression and thus very efficiently supplies electricity for the electric drive. So while the drive concept, in principle, already requires less fuel than conventional systems, there is now a further optimization. ‘With this fuel mixture, the Audi RS Q e-tron saves more than 60% in carbon dioxide emissions,” says Dr Fabian Titus, Application and Thermodynamics Development. This development, driven by Audi, complies with the strict chemical specifications of the FIA and ASO fuel regulations. They are similar to the regulations for commercially available fuel grades with 102 octane. Such a high value guarantees the anti-knock properties of the fuel-air mix during the combustion process. With this innovative fuel, the combustion engine achieves slightly higher efficiency than fossil-based gasoline. However, the oxygen content in the eFuel reduces the energy density of the fuel, which is why the volumetric calorific value drops. The RS Q e-Tron, therefore, requires a larger tank volume.
Of course, this does not give the vehicle a regulatory advantage because fuel flow meters determine energy consumption with maximum precision in the interest of equal opportunities among the participants. In its premiere year, 2022, the first generation of the RS Q e-tron already completed the daily rally stages in January and March in a highly energy-efficient manner thanks to the electric drive with energy converter. A sign...
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Audi RS Q e-tron saves over 60% CO2 at the 2023 Dakar Rally Audi RS Q e-tron saves over 60% CO2 at the 2023 Dakar Rally


News source: racecar-engineering
Publication date: 23-11-2022 22:05
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