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Originally Posted by MNBoxster
Hi,
Are you on Stock Tire and Wheel Sizes? Are these Original to the Car? If not, the error may have been induced when switching sizes and failing to get the DME recalibrated. But, what are you referencing your speedo against? Are you sure the reference is accurate and not possibly the one with the error? Hope this helps...
Happy Motoring!... Jim'99
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Yes stock wheels and tires, about 85% left. So there should be no error. Bascially to check the speedo use the paddle markers along the road driving at constant speed over the measured mile. Use the seconds over a mile divided into 3600 gives you the speed. Do this for a few miles and can get really close to speedo error if any.
mike