No offense taken and thanks for the support mate and yup I sure do get a bit of flack for speaking the truth and trying to do things by the book like you. Its ok we all get things wrong at some point or another.
tmenz,
Feb 18, 10:57pm
On a cable driven system the odometer is locked to the speed of the cable and has an absolute relationship to it. The speedometer is not locked to the cable and has an arbitrary relationship to the cable speed determined mainly by calibration. On an electronic system where the speedometer and odometer are driven by pulses from a 'pickup' on the gearbox output rather than a cable, then the relationships are as for the cable system if the speedometer display is still a mechanical device. However, if the speedometer is an electronic display then both are 'locked' to the pulses and each has a fixed relationship to the other - determined by calibration, usually in software/firmware. In all cases most of the errors occur in the relationship between the gearbox output speed and the rolling diameter of the tyres. Tyre sizes, wear, inflation. temperature etc. are the uncontrolled factors that manufacturers cannot allow for and are the source of most of the errors. The manufacturers therefore tend to err on the high side with their factory speedometer calibrations to try and allow for worst case factors.
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