A very wide range of powertrains will be offered in the A7 and its S7 and RS7 sport-focused variants. Everything from diesel-electric hybrids to 600hp V10s will be found under the hood of one variant or another. The hybrid drive is expected to show up first in the company’s Q5 soft-roader. A diesel-electric version is rumored, but the company may end up using a gasoline engine instead.
The more ordinary A7 variants will be powered by a pair of V6s. The first, a 204hp 2.8L engine is the base model, while the 3.0L supercharged engine making 300hp will be the first step up. An upgrade to S7 trim will bring with it another 94hp in the form of a 4.0L V8. The RS7’s 600hp 5.0L twin-turbo V10 is the range-topper. The S7 and RS7 will be released two years apart, with the S7 arriving first in late 2010 or early 2011 and RS7 after that.
Source: Motor Authority