From YourSITE.com
New Audi A3 Automatics Pioneer Start-Stop
By source: Audi UK
Oct 19, 2009, 17:54
• Fuel saving start-stop function which was previously reserved for four-cylinder manual gearbox models becomes available in conjunction with S tronic automatic transmission (£1,420 in A3 models)
• Recuperation system to harness kinetic energy generated during braking also boosts economy
• A3 1.4 TFSI and 1.6 TDI models with much praised S tronic twin-clutch automatic transmission are first to benefit – prices from • £18,300 OTR and £18,905 OTR – available to order now for first deliveries in December
• A3 1.4 TFSI S tronic with start-stop – 0-62mph in 9.3 seconds, top speed 126mph, combined mpg 53.3, CO2 124g/km
• A3 1.6 TDI S tronic with start-stop – 0-62mph in 11.7 seconds, top speed 121mph, combined mpg 67.3, CO2 109g/km |
Automatic versions of the latest economy focused Audi A3 models are the first in the premium sector to benefit from the latest engine start-stop technology, which has already helped to cut emissions in manual transmission TDI versions to a sector-leading 109g/km. The new highly efficient 1.4 TFSI petrol and 1.6 TDI versions of the A3 equipped with the acclaimed S tronic twin-clutch automatic transmission will spearhead the new technology, which also goes hand-in-hand with a recuperation system to harness braking energy.
In its newly developed form for automatic applications, the start-stop system cuts engine power when the car comes to a standstill at traffic lights or in queueing traffic – the engine then remains dormant as long as the brake pedal is depressed and then restarts in just two-tenths of a second only when it is released in readiness for take-off. With the system’s help, economy is boosted and CO2 is reduced by approximately 5g/km, but if required it can be deactivated at the touch of a button.
The start-stop system is also supplemented in these models by recuperation technology, which provides further fuel and CO2 savings by recycling a proportion of the wasted kinetic energy generated under normal braking and normally dissipated as heat, and storing this temporarily in the vehicle battery to reduce the engine load when the car subsequently accelerates again. With its help, fuel usage is reduced by as much as three per cent in the A3.
Ingenious S tronic
Advanced electro-hydraulic controls and the alternate use of two clutches enable the S tronic gearbox to deliver lightning fast automatic or manual shifts via the gear lever or steering wheel-mounted paddle controls with no interruption of the engine’s power delivery across seven ratios.
The first of the two clutches serves the odd-numbered gears and reverse, and the second the even-numbered gears, so when the A3 is travelling in third gear, for instance, fourth is already pre-selected in anticipation. As soon as the shift command is given, the first clutch is disengaged and the second engaged in just a few hundredths of a second, virtually seamlessly.
Despite this transmission’s distinctly sporting slant, it can actually improve economy and reduce CO2 output while at the same time quickening acceleration. This is true of the A3 1.4 TFSI S tronic with start-stop, which reaches 62mph from rest 0.1 seconds more quickly than its manual counterpart at 9.3 seconds, and has a 3.7 mpg advantage over the manual option in the combined cycle economy test, recording 53.3mpg to its 49.6mpg. CO2 is consequently also down at 124g/km, versus the manual version’s 132g/km. With or without the S tronic option, the A3 1.6 TDI remains the most economical and efficient model in the Audi range, with a combined economy figure of 67.3mpg (manual 68.9) and CO2 output of just 109g/km.
About Audi UK
The Audi brand exceeded the milestone 100,000 sales mark in the UK in 2007 and 2008. Globally, the brand exceeded 1 million deliveries for the first time in its history in 2008. With its programmes for both road and race cars the brand continues to maintain its upward trajectory. On the road it has extended its reach into important new segments with new models such as the A5 Sportback, the Q5, the TT RS and the R8 5.2 FSI quattro, and in the near future will break further new ground with the A1 compact hatchback and the Q3 compact SUV. On the race circuit Audi Sport has contested the Le Mans 24-hour marathon eleven times since 1999, achieving a podium finish on all of these occasions and outright victory a total of 8 times.
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