snowy892 Posted 6 hours ago Posted 6 hours ago Afternoon all, I need to recalibrate my smiths speedometer, I've got a pre 2004 telemax type. I've measured that it does 69 inches per full wheel rotation. You then somehow need to turn that figure into a number on the speedo, which i can access! Instructions on caerbont automotive website are somewhat confusing (to me) Can anyone simplify the process for me. Quote
GaryD1971 Posted 5 hours ago Posted 5 hours ago Hi Richard. Does the below help at all? Very similar process to my raceline speedo. Gary. Quote
snowy892 Posted 2 hours ago Author Posted 2 hours ago Hi Gary, Thanks for the info, unfortunately that for 2004 onwards mines a pre 2004 unit. https://www.smiths-instruments.co.uk/app/uploads/2023/05/pil017-368.pdf https://www.smiths-instruments.co.uk/app/uploads/2023/05/speedo-dip-switch-tables-437.pdf If you ever get time, read the above!! 1 Quote
p k Posted 2 hours ago Posted 2 hours ago Need a little bit more information. Where is the sensor mounted . How many pulses (bolt heads passing the sensor per wheel rotation) Possibly diff ratio Quote
snowy892 Posted 2 hours ago Author Posted 2 hours ago Hi PK Sensor is mounted on the drivers side wheel bolt heads passing the sensor per wheel, i don't know - is it a case of just watching it? Dif I believe is standard 3.62 Quote
p k Posted 2 hours ago Posted 2 hours ago 14 minutes ago, snowy892 said: Hi PK Sensor is mounted on the drivers side wheel bolt heads passing the sensor per wheel, i don't know - is it a case of just watching it? Dif I believe is standard 3.62 Yes . it should be fairly obvious what passes near the sensor just need how many in one wheel rotation Quote
GaryD1971 Posted 1 hour ago Posted 1 hour ago If it's pointing at the disc, it'll be four bolts per revolution. By my reckoning, your tyre turns 918.2 times per mile. 918.2 x 4 = 3672.8 or 3673. The table shows the switch settings for 3672 which will be close enough. Set the switches to the settings above for 3672 and follow the rest of the instructions. That should do it. Quote
GaryD1971 Posted 1 hour ago Posted 1 hour ago Assuming the drivers side wheel you refer to is the front wheel? Quote
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