A good gotcha for (non GPS) data logging.
We spent two weeks trying to find out why the car was so slow down the back straight at Snetterton.
Eventually traced it to replacement data logger having two digits on the tyre circumference being transposed.
Doh.
Yes, it was the fact that the RPM figure was fine and that the track had suddenly changed length that gave it away!
Good example though of how data logging can easily lead up up the wrong path.
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