I have tried the forum search tool but not getting anywhere so reaching out to the technical wizards on the forum for this query.
For my current project, the two speedos rolling around in the bottom of the spares box were trashed and unusable so I upgraded to a Smith's 200kph electronic unit. The installation instructions are fairly cavalier when it comes to calibration and setup so wondered if any one had some input data they had used for their own setup.
To calibrate, there are 2 options. 1/ you can drive an exact distance and the unit will sense how many pulses it received, or 2/ you can input tyre revolutions per mile and then count the number of spindle rotations that occur while pushing the car 6 tyre rotations (presumably in gear) and then you can calculate the pulses-per-unit for the speedo to use.
Counting spindle rotations on a Mini is not humanly possible considering it's location, whilst pushing the car exactly 6 tyre rotations - unless I set up some sort of video recording of the speedo housing.
I have reached out to Caerbont Instruments technical department but they weren't able to help.
Does any one know a way to calculate spindle rotations? I am running a standard A+ gearbox with 3.44 final drive and a green 16-tooth speedo spindle. Additionally, I'm running 165/70R10 wheels that make 1057 revolutions per mile.
Any help would be appreciated. Thanks