Quote:
Originally Posted by BlueZ4AZ
Road & Track test drove the 35i 0-60 mph in a published time of 4.8 seconds. Does this mean that the 3.5i goes only goes from 0-56 mph in 4.8 seconds, not to 60 mph, assuming they test drove one with an innacurate speedometer?
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They use GPS:
The system that we use to record-braking data is the same we use for acceleration testing, our GPS-based VBOXIII by RaceLogic. This system samples our location 100 times a second in three dimensions using anything from six to 12 satellites for triangulation, and therefore can calculate distance, speed and acceleration in virtually every direction (though the X and Y coordinates are most accurate).
http://www.roadandtrack.com/article....rticle_id=8155