Audi adds a new member to the A3 family: the A3 Sportback 30 g-tron. Operation with natural gas or biomethane makes the compact model particularly economical and climate-friendly with very low emissions. Like all variants of the new A3 model series, it boasts a sporty design, a digital operating concept and generous standard equipment. Sales in Germany begin in fall 2020 at a base price of €30,705.88.
The first A3 Sportback g-tron introduced by Audi in 2014 already featured a sophisticated technology concept. The successor builds on that. Its 1.5 TFSI engine produces 96 kW (131 PS) and generates 200 Nm (147.5 lb-ft) of torque between 1,400 and 4,000 rpm. Its turbocharger with variable turbine geometry makes optimal use of the exhaust gas energy for early and harmonious torque development. The Miller combustion process provides tremendous consumption advantages during normal driving. With its abbreviated compression phase and long expansion phase, it was designed specifically for operation at partial load.
Operation with the knock-resistant fuel CNG enables a higher 12.5:1 compression ratio compared with the conventional combustion process of the 1.5 TFSI 110 kW (150 PS) and also improves efficiency. The cylinder head, injection system, turbocharger and catalytic converter were modified accordingly for the CNG engine. Before the gas reaches the injector valves, an electronic pressure regulator reduces the pressure from as much as 200 bar, which can prevail in the tanks, to between 5 and 9 bar.
The CNG model accelerates from 0 to 100 km/h (62.1 mph) in 9.7 seconds on its way to a top speed of 211 km/h (131.1 mph). Average NEDC fuel consumption for the four-cylinder is just 3.6 – 3.5 kilograms CNG (Compressed Natural Gas) per 100 kilometres, corresponding to a CO2 equivalent of 99 – 96 grams per kilometre (159.3 – 154.5 g/mi). With full gas tanks, the car has an NEDC range of up to 495 (307.6 mi) kilometres and a WLTP range of up to 445 kilometres (276.5 mi). This is supplemented by the additional range offered by the reserve gasoline tank with a net usable volume of 9 litres (2.4 US gal) mounted in front of the rear axle. Power is transferred to the front wheels via the standard seven-speed S tronic.
The four-cylinder always starts in CNG mode, only injecting slight amounts of gasoline under rare operating conditions. If the pressure in the gas tanks drops below a certain threshold, which varies depending on the current driving state, the engine switches to gasoline mode. The driver does not notice this switch. The fuel level in the tanks and consumption in the respective operating mode are displayed in the digital instrument cluster. The two filler necks are placed under a common fuel flap.
Source: Audi