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Audi will unveil
three new vehicles at Frankfurt’s International Motor Show (IAA): the
supercharged S5 Sportback, the extremely low-emission A4 3.0 TDI clean
diesel quattro, and the highly efficient A3 1.2 TFSI. These innovative
engines boast some very different key data, yet they all have something
in common: They embody Audi’s conviction that dynamics and efficiency
are not mutually exclusive.
Extremely clean: Audi A4 3.0
TDI clean diesel quattro
Audi debuted the 3.0 TDI clean diesel
engine in its Q7 SUV; now, the world’s cleanest diesel technology will
also be available in the best-selling A4. A package of technologies
provides innovative solutions for engines and the after-treatment of
exhaust gas.
The engine features a new common-rail
injection system,
innovative pressure sensors in the combustion chamber, and an especially
high-performance exhaust recirculating system. Collectively
these measures ensure a highly efficient and low-emission combustion
process. A novel DeNOX catalytic converter, integrated within the end of
the exhaust system, reduces residual nitrogen oxides. Just upstream of
it, a pump injects an additive named AdBlue into the hot exhaust flow;
there, this aqueous solution decomposes into ammonia — which splits the
nitrogen oxides into nitrogen and water.
The A4 3.0 TDI clean diesel quattro
already complies with the emission limits of the EU’s Euro 6 standard,
expected to become law in 2014. It is also very fuel-efficient, with the
potential to cover up to 42.1mpg (Avant: 41.5mpg). And this TDI engine
is indeed a powerful performer, needing only 6.2 seconds (Avant: 6.3
seconds) to go from zero to 62mph. Top speed is electronically governed
to 155mph. In conjunction with a six-speed tiptronic and quattro
permanent all-wheel drive, this vehicle guarantees a high degree of
comfort and superior traction.
Efficient Downsizing: Audi A3
and A3 Sportback 1.2 TFSI
Downsizing is an element of Audi’s
efficiency strategy to which it is absolutely committed. The A3 model
line will soon introduce yet another turbocharged petrol engine
featuring lower displacement. It unites maximum performance with minimum
consumption.
Designed from scratch, the new 1.2 TFSI
generates 105PS from a displacement of 1,197 cm3. And as is typical of
Audi, turbocharging and direct petrol injection once again work in
harmony to maximise efficiency. Thanks to an aluminium crankcase, this
four-cylinder engine weighs just 89.5 kilograms; this remarkably low
weight also boosts its efficiency.
The 1.2 TFSI has been optimized to minimize friction. Eight valves
are actuated by a single camshaft. A common-rail system injects the
fuel. An electric control valve operates the turbocharger’s wastegate
valve; boost pressure builds up spontaneously and scavenging losses
drop.
This compact engine generates 175 Nm (129.07
lb.-ft.) of torque between just 1,500 and 3,500 rpm. It propels the
three-door A3 1.2 TFSI from 0 to 62mph in 11.1 seconds; the Sportback,
in 11.3 seconds. Both versions reach a top speed of 118mph and can
return up to 51.3mpg (combined cycle), while emitting just 127 grams of
CO2 per kilometre. The new engine will initially be paired
with front-wheel drive and a six-speed manual transmission. Elegant dynamics: Audi S5
Sportback
The S5 Sportback is the pinnacle of the
new Sportback model line. This elegant, five-door coupé is propelled by
a three-litre V6 with a mechanical compressor. From a displacement of
2,995 cm3 the compact turbo engine delivers 333PS and 440 Nm (324.53
lb.-ft.) of torque between 2,900 and 5,300 rpm. The S5 Sportback
sprints from 0 to 62mph in 5.4 seconds; its top speed of 155mph is
limited by an electronic governor. Its combined economy figure of
29.1mpg is the best in this
power-output category.
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