http://www.racelogic.co.uk/
This stuff is beeing used by BMW, Ford, Daimler Chrysler, Pirelli, Goodyear, Michelin, Porsche, Ferrari, Aston Martin, the BBC's Top Gear program, Toyota, Honda etc.
Anyway, S5 acceleration times are as follows:
0-60mph - 4,78s
0-100km/h - 5,02s (5,1s claimed by Audi)

It is and it is not a surprise for me. It is, since it is rare to see acc times beeing better than calimed by the manufacturer. On the other hand it is not - I already knew that the car IS fast after beating friends 997.1 Carrera 2S (manual tranny) 4 times in a row on a 1/4 mile run ...
Car: 2010 Audi S5, manual transmission, 18" stock wheels, 245/something/18 Bridgestone RE50A rubber - all stock
I also measured braking distance 100-0km/h (sorry, but I have those numbers only in meters; the software can calculate that into 50-0mph or 70-0mph if you like).
2010 Audi S5: 35,4m
As a point of reference, I also measured my two other cars: my wife's Merc and my Subaru track car:
2006 Mercedes E-class 200K W 211: 44,0m (225/50/16 Continental Sport Contact 2 rubber, bone stock)
2002 Subaru WRX: 38,2m (MY07 OE 4-pot calipers, Toyo R888 225/45/17 semislick rubber, DS2500 performance pads, Brembo disks)
S5 outclassed them both.
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