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I'm not sure if it has changed, but it used to be that most magazine skidpad tests were done by timing then calculating average lateral accel vs 9.81 m/s^2 (G), not through use of accelerometers. That's probably where the discrepancy lies. Accelerometers are tough to get to read accurately in the type of movement present on a skidpad, at least the accelerometers I have worked with would be. It requires the surface to be even despite body roll or the results will be skewed. Of course, there could be some kind of equipment that I'm not aware of. Still, the pedders results are impressive in comparison to stock vette numbers.
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