If you can get it completely level and zeroed out before you start, they are pretty accurate on 0-60 and 1/4 times. Getting it just right is difficult though. ignernt is referring to lateral acceleration (measuring the cars cornering ability), I've never tested it myslef, but I'm tempted to hook it up at an autox next year. 1g of lateral acceleration means that the car can handle a sideforce equal to its weight (about 3000 lbs in a Cougar).
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