Driving the 2.0 TDI:
The A6 has the same 1,968cc engine that powers my Volkswagen Jetta. In the pre-facelift model, it was tweaked to produce 175 BHP. Now, it has been further tweaked to develop 187 BHP and Audi claims a 7% reduction in fuel consumption. This engine is the main workhorse for the VAG group, but some issues with long-term reliability of the injectors and water pump remain:
Unlike its VW brothers, the engine is longitudinally mounted. Note the overhang:
Finding the start button is the first task. It is located on the left hand side of the centre console (a hangover from the LHS origins). You'll get used to it:
Press the start button and the seatbelts greet you with a tight grip...and then release. Basically, they are checking you out in order to calibrate the required intensity of the airbag and seatbelt tensioner in the unlikely event of an impact. Then you hear a muted hum. The car certainly does not hide its diesel heart externally. On the inside, the engine is muted with a rather dull drone. The Mercedes 250 CDI has a nice rough growl to it. The BMW 520d sounds like a bag of nails when idling, but it has a nice thrum when spinning. In the Audi, it drones. Select drive and the engine hums - it does not irritate you, nor does it inspire or talk to you. It's a bit like an engine in a ship, doing its job while you guide and navigate.
For a sedate driver or someone being driven, the car delivers well. Mid-range acceleration is very brisk, but enthusiasts will find that there is no surge, no excitement. At lower speeds, the engine has bags of torque to get the car going. Comparatively, the 520d has some lag, but when the turbo spins, it pushes you hard. The Mercedes envelopes you in bags of torque. The Audi is very linear in this respect.
Performance-wise, the engine provides adequate power and acceleration most of the time. If there is any turbo lag, the DSG hides it very well. However, when summoning speeds beyond 120 kph or asking for rapid mid-range acceleration, you can hear the engine working hard to get there. You keep getting the feeling that it would run out of breath.
For most practical purposes, the power is fine for our conditions, but keener drivers would be disappointed. The presence of the 3.0-litre Quattro might have addressed the performance at the high end as well as some of the understeer issues. If you are being driven, the current engine meets one's needs. It is muted and has enough waft to carry you forward, but there will be times that you want more. This statement is applicable to the 4-cylinder E-Class & 5-Series too.
Getting back to the DSG box, it has improved the A6 by leaps and bounds - no more rubber band effect and slow reactions of the CVT. You can be in exactly the right gear for the right situation. Upshifts are fast and gear changes are very smooth. The only issue we encountered was that the box was occasionally jerky, when we suddenly slowed down for cows and other traffic obstructions and then accelerated. This was mainly due to the car anticipating that we were stopping instead of accelerating. In Udaipur's obstacle-ridden traffic, the A6 picked up where it left off every time a cow appeared. A lot of it is due to the DSG S-tronic box being hyper responsive in these situations. Again, the car had less than 1,000 km on the odometer and was yet to learn our driving style. At higher speeds or in predictable situations, the gearbox was smooth.
As mentioned earlier, we had Comfort, Dynamic and Auto modes to play with.
We started with the Comfort mode. The steering weight was a little less. In city speeds, comfort mode is good. At high speeds, from both the front and rear seats, I found the car wallowed and the body control was poor. It floated at speeds over rough roads and one did not feel the sharp bumps, but the car felt a little wobbly. Rear passengers will find it comfortable at moderate speeds, but might get sea sick at higher speeds.
In Dynamic mode, the steering firmed up and the car felt responsive. The ride was firm and the car was much better controlled. No prizes for guessing which mode I would choose. Yes, you feel the bumps, but this was felt more at the rear, where the ride can get choppy on rough surfaces. Bottom line = Use comfort mode in the city and Dynamic mode on the highway.
Auto mode sees the car remain in Comfort mode at moderate speeds, but firming up when the car is driven aggressively. The good thing about this mode is that the car gradually switches between modes and does not act schizophrenic (switch randomly between them).
The stability of the car on highways with patchy roads is excellent. We used the Dynamic mode extensively. The car was rock-steady and one could easily cruise all day at ease. My recommendation would be to remain in Dynamic mode, but switch to Auto on roads of variable quality.
The steering has been given more weight in terms of feel than before. Hence, you get a better sensation of driving. It goes where you point, although you get very little feedback on what is happening. Basically, you cannot depend on the steering feedback for inputs when trying to throttle steer. On long fast bends, the chassis showed a very strong understeer bias. Turn in required a lot more input than required. We missed the rear end power of the Quattro, which would counter this. On gradual fast bends, we had to keep steering in order to maintain the line. On tighter bends, things might get messier. Comparatively, a BMW 5-Series will urge you into a bend and tell you exactly what happens, while a Mercedes will merely act according to your bidding. The A6's FWD disadvantage is obvious when driving hard (E-Class & 5-Series are both RWD).
We experimented with the ride height, albeit it did not make too much of a difference. As mentioned earlier, the 1.8 TSI was not announced (although we did have the specs for it in the media pack). I anticipate that, with a lighter front end, it would be more eager in the corners.
The brakes are excellent - progressive and with lots of feel.