Nice road test report here of the Audi A8L W12 quattro. Great ride!
Now bored out 0.3 liter (to 6.3) and sporting direct injection, the W-12 puts out 500 hp and 463 lb-ft of torque, improvements of 50 and 35, respectively, over the 2010 model. With twelve cylinders arranged over four banks of cylinders (hence the “W-12” designation), it is certainly a curiosity, and it compares favorably to the cutting-edge turbocharged 12s powering its competitors from BMW and Mercedes. The roundel’s 760Li manages 535 horses from 6.0 liters, while Benz’s S600 makes 510 with just 5.5 and its S65 AMG honks out 621 with 6.0. Compared to the competition, the W hurls the A8L to speed with the same all-important sense of ease, accompanying its thrust with a husky growl so smooth it almost sounds like a monster rotary.
Standard all-wheel drive and an eight-speed automatic transmission, plus a 4759-pound curb weight afforded by its all-aluminum construction, help the W-12 hit 60 mph in 4.1 seconds—bettering the BMW by 0.2 and both Benzes by 0.1—and blow through the quarter-mile in 12.6 at 114 mph.