We have various models of this data logger in our fleet, ranging from 10-Hz units (that's 10 points of data per second) to 100 Hz, and one of them even uses the Russian GLONASS satellite system in conjunction with GPS to deliver speed accuracy within 0.1 mph and positional accuracy within about six feet. Piggybacking it with a GPS base station (a device used to correct GPS positional inaccuracy) and a VBOX 3iSL (100Hz) can deliver positional accuracy to within one inch. The VBOX is what we use to measure acceleration times, braking, and top speed. Our VBOX 3i units (we have four of them) also have the ability to log vehicle data such as steering angle, engine speed, and throttle position through the vehicle's CAN communication interface. Straight-line acceleration consists of three different tests: the standing start (from which we pull all the zero-to-speed times), the 5-to-60-mph rolling start, and two top-gear acceleration tests (30 to 50 mph and 50 to 70 mph). The rolling start is a C/D creation, in which we creep along at 5 mph and then accelerate as hard as possible. This test illuminates differences in powertrain flexibility. The larger the difference between a 5-to-60-mph and a zero-to-60-mph run, the more lag an engine has this is particularly relevant today with the flurry of turbocharged engines.

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