Fastest I ever accelerated and rode was on a Yamaha racing bike. A friend let me ride it and I was accelerating hard, before I knew it was doing 170kph in 3rd! That was the signal for me to ease off, as I have very little experience with motorbikes. The guy took me with him and we did 270kph !!!! I was on the back and my helmet started to lift badly!
In a car fastest behind the wheel: 180kph in a Celica. Not behind the wheel: 270 in a BMW M5 without limiter!!!
Best ride not behind the wheel which appeared to be the fastest: in Lotus 7 replica Formula 27, 200kph!!! That was the greatest ever.