2021 Audi SQ5 Sportback – V6 3.0 TDI Twin dosing

The 2021 Audi SQ5 Sportback TDI features a 3.0L V6 twin-turbo diesel engine with a twin-dosing system that uses two Selective Catalytic Reduction (SCR) converters to significantly reduce NOx emissions to below Euro 6d-ISC-FCM-AP standards. This powerful engine produces 341 PS (251 kW) and 700 Nm of torque, propelling the SQ5 Sportback TDI from 0 to 100 km/h in 5.1 seconds. Key engine features include forged steel pistons, piezoelectric injectors for precise fuel metering, a lighter turbocharger compressor, and a water-to-air intercooler for enhanced performance and efficiency.

> Three-liter V6 diesel engine generating 251 kW (341 PS) and 700 Nm (516.3 lb-ft)
> Twin-dosing technology with two NOx catalytic converters arranged in series
> Powerfully rugged exterior design with striking sporty elements
> Optional Matrix LED headlight and rear lights with digital OLED technology

Two SCR catalytic converters interact: the exhaust gas aftertreatment
For exhaust gas aftertreatment, Audi uses twin-dosing technology based two SCR catalytic converters working together. The first of these is located directly behind the manifold in the exhaust gas system, where it also functions as a particulate filter.

The second is located further away from the engine under the vehicle floor. Both catalytic converters complement each other’s effects because they cover different operating situations and exhaust gas temperature windows. The SCR catalytic converters are supplied with the AdBlue urea solution from a 24-liter tank. Thanks to twin-dosing technology, the SQ5 TDI2 comes in substantially below the limits of the new “Euro 6d ISC-FCM AP” emissions standard, which also stipulates a dramatic reduction in NOx emissions in the real driving test conducted on public roads in everyday traffic situations.

Engine Specifications & Technology
Engine: 3.0-liter V6 twin-turbo diesel
Power: 341 PS (251 kW)
Torque: 700 Nm (516.3 lb-ft) between 1,750 and 3,250 rpm
Performance: 0-100 km/h in 5.1 seconds, with an electronically limited top speed of 250 km/h (155 mph)
Twin-Dosing Technology: Two SCR catalytic converters, one behind the manifold (also a particulate filter) and another under the vehicle floor, are supplied with AdBlue. This ensures effective NOx reduction across various operating temperatures.

Forged Steel Pistons: Reduce heat loss and maintain strength without adding weight.
Piezoelectric Injectors: Enable highly precise, up to eight injections per work cycle.
Lightweight Turbocharger Compressor: Achieves rapid boost pressure for spontaneous torque delivery.
Water-to-Air Intercooler: Located in the engine's V-shape, improving efficiency and quickly reaching ideal combustion temperatures.
Mild-Hybrid System (MHEV): A 48-volt mild-hybrid system recovers up to 8 kW of power during deceleration to enhance efficiency.
Transmission & Drivetrain
Eight-Speed Tiptronic: A fast and smooth-shifting automatic transmission.
quattro All-Wheel Drive: Transfers torque variably to the front and rear axles as needed.
Optional Torque-Vectoring Sport Differential: Provides enhanced traction by sending more torque to the outside wheel in corners.