Technical data

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TDI®44
TDI®
In other words: Where is the tank?
One in every two Audi cars sold today is a diesel.
What sounds perfectly normal now was cause for
huge excitement 20 years ago, when Audi
revolutionised the market with the first 2.5 litre
TDI engine. Since then, developments such as
common rail technology have made TDI even more
efficient. Piezo injectors ensure the fuel is finely
and precisely distributed. Consequently, since the
first TDI, the engines have become more
economical, whilst specific output has increased.
Choose for yourself which power you wish to
carry you away in the Audi Q7: a 3.0 TDI quattro
with 150 kW or 180 kW (also available as a TDI
clean diesel quattro) or a 4.2 TDI quattro with
250 kW.
All the engines comply with the EU5 emission
standard, the TDI clean diesel quattro even
complies with the EU6 emission standard, which
does not come into force until 2014. The 6- and
8-cylinder engines are fitted with a recuperation
system which converts kinetic energy into electrical
energy. This increases efficiency and saves up to
3 % fuel – particularly in city traffic. Together with
the start-stop system in the 3.0 TDI engines that
automatically switches the engine off when the
vehicle is at a standstill, fuel consumption can be
significantly reduced.
In addition to the standard catalytic converter
and the diesel particulate filter, the Audi Q7 as a
3.0 TDI clean diesel quattro has a nitrogen oxide
catalytic converter with AdBlue®* tank. AdBlue®
is a biodegradable additive, small doses of which
are injected upstream of the nitrogen oxide
catalytic converter. Combined with other
innovations such as common rail technology and
highly efficient exhaust-gas recirculation, a
reduction of the nitrogen oxide emissions by up
to 90 % is achieved. With the 4.2 TDI quattro
with 250 kW, you can also choose a highly
efficient and powerful diesel engine. The peak
torque of 800 Nm and the running smoothness
of the V8 engine impress both over short and
long distances.
The injectors open and close in
fractions of a millisecond and
inject fuel several times into the
combustion chamber at pressures
of up to 2,000bar. In some cases,
an injection process can involve the
injection of the tiniest of amounts
weighing less than a thousandth
of a gram.
Pre-injection results in a “gentle”
combustion process and consequently
excellent combustion acoustics and
agreeable engine running
characteristics.
The fuel consumption and CO₂ emission figures can be found from page 106 onwards. * Registered trademark of the Verband der Automobilindustrie e. V. (VDA).
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