Audi and Bentley have developed a new V-8, compact twin-turbo 4.0-liter, which can automatically switch to the fuel economy four-cylinder mode. The only visual difference between the 2012 Audi S8s an engine with a new and old car models have four small microphones Active Noise Control System and a horizontal bar graph tach and speedometer between the driver indicates when a large sedan is running Mode V-4 or V-8.
I drove the Bentley Mulsanne its cylinder deactivation system last year, so I was intrigued to see how Audi simplified. Bentley does not bother with a chart that shows the driver is in eco mode, and frankly, I think Audi little distracting.
After a while, I guess you either get used or just ignore the green bar flashes on the left and right as the engine of dips in and out of state V-4/V-8. But a short 12 - Mile Drive through the suburb of Ingolstadt, I realized looking for a place of transition between V-8 and V-4 and found it difficult and frustrating to maintain a green V-4 mode. Going by my experience of Bentley, I believe, on the highway at high speed would be to find easily slip into the V-4-State, as the miles passed.
In the Bentley, I could not tell if its 6.75 liters V-8 running on all eight cylinders to four only. The same is not entirely true for the S8 4.-liter, there is a subtle change in the cylinders of the engine exhaust hole exceeding eight to four, it was perhaps more aware of it because I kept looking for that tipping point. To ensure the smooth running as a V-4, switchable active electronic engine mounts are used in an Audi for the first time, all the active noise control in the cab of the costumes are not intrusive engine noise.
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