The new units are two direct gasoline injection engines with displacement of 183 cubic inches (3.0 liters) and six cylinders. They are used in various vehicles in the VW Group, but perhaps most importantly in Audi‘s exclusive S and RS models. The combustion engines were designed from the outset for hybridization, allowing them to be combined with an electric drive. One particular challenge for the developers was to surpass the already excellent transient response of the predecessor generation with mechanical boosting, while at the same time improving both performance and fuel economy.
Pure power in two versions
The entry-level version is equipped with a high-performance Twin Scroll turbocharger with waste gate and delivers 349 hp (260 kW). The maximum torque of 369 lb-ft (500 Nm) is available from just 1,400 rpm. This performance is sufficient to catapult the approximately two-ton Audi SQ 5 from 0 to 60 mph in just over 5 seconds. Even with this impressive power delivery, the vehicle still delivers excellent standard fuel consumption of 28 mpg US (34 mpg UK) with premium grade gasoline.
The more powerful V6 BiTurbo version delivers 429 hp (320 kW). One BorgWarner turbocharger with waste gate is used on each bank of cylinders here. With maximum torque of 442 lb-ft (600 Nm), the drive provides almost limitless power in vehicles like the Audi RS 5, allowing this sporting yet elegant coupé to sprint from 0 to 60 mph in under 4 seconds. The power and torque available make the standard fuel consumption of 27 mpg US (32 mpg UK) even more impressive.
Efficient thanks to the latest turbo technology
The turbochargers replace the supercharger, which was fitted to the predecessor units. Despite the increased drive power requirements, the turbocharging technology from BorgWarner is capable of significantly improving both the torque and transient response of engines over the previous generation, while also reducing fuel consumption. This is an impressive achievement, as the existing engines with mechanical boost already displayed excellent characteristics in this regard.
Another special feature of the new engines is that the turbocharging systems are positioned between the cylinder heads, i.e. inside the engine‘s „V“. This places very strict requirements on the turbochargers used, which must be particularly compact yet also extremely heat-resistant. However, all of the development efforts are now paying off. Thanks to the favorable positioning, the developers were able to optimize the exhaust gas stream and minimize flow losses.
The advanced Twin Scroll technology from BorgWarner has already been proven in numerous applications and guarantees dynamic power delivery from very low revs. It improves the engine‘s transient response and makes its maximum torque available both quickly and across a very wide speed range. A clever channel design, optimized for efficient airflow using computer-aided simulations, ensures that the exhaust gas stream is fed to the turbine wheel with maximum efficiency on both the Twin Scroll turbocharger and the BiTurbo version.
New collaboration milestone
The new high-tech engines mark another milestone in the longstanding collaboration between Audi and BorgWarner. Employing the latest turbocharging technology, the turbocharger specialist is making a key contribution to further optimizing the performance, consumption and exhaust emissions of engines in the VW Group.
Keeping up the pressure:
the Twin Scroll turbocharger and the BiTurbo version from BorgWarner optimize both the performance and consumption of Audi‘s 3.0 TFSI engines.
Photo: © BorgWarner