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Speedo angle drive

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  • Phil S
    replied
    they usually need axle ratio, distance of travel of 1 revolution of the road wheel in inches to calibrate

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  • trunt
    replied
    It’s relatively easy to recalibrate the speed reading it’s about magnets and pointer position but the miles are a function of the gears in the speedo I think, not so easy.

    Terry

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  • Andy Mathers
    replied
    Thanks al - I admit its a mystery - it would account for why I'm not getting 40mpg !!! Speedo reads accurately but mileage it overreads. I had the speedo at The Gauge Shop for mileage correction and asked that this be adjusted for the 2.5s Diff ratio. I guess I'll need to have a chat with Alan Davies to see what it might be..
    Thanks all

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  • mallardstag
    replied
    If the speed is correct but miles are wrong it MUST be a problem with the speedo as said above.

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  • new to this
    replied
    Originally posted by Andy Mathers View Post
    Last year I fitted the 2.5s estate diff and speedo to my stag.
    Road speed is spot on but mileage is way out - do I have to change the angle drive under the car to correct the milometer readings ? If so does anyone have one or can anyone tell me the part number ?
    Many thanks
    You said you fitted 2.5 diff and speedo head, ,are the tyre sizes the same Stag and 2.5s ,if they are your need to change the gear box speedo gear there different colours ( inside the gearbox take out angle drive its under there )

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  • trunt
    replied
    If the speedo and odometer are different, that has to be a problem with the speedo. The other factor you did not mention is the speedo gearing in the gearbox. The stag usually has a 3:1 ratio but other cars may have different ratios. What ratio is used on the 2.5 Estate?

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  • Lingen
    replied
    Andy.
    I have never heard of angle drives coming in different ratios. They are 1 to 1. How the speedo can be correct and the mileometer wrong though, I can't understand. No doubt there will be suggestions!
    Mike.

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  • Andy Mathers
    started a topic Speedo angle drive

    Speedo angle drive

    Last year I fitted the 2.5s estate diff and speedo to my stag.
    Road speed is spot on but mileage is way out - do I have to change the angle drive under the car to correct the milometer readings ? If so does anyone have one or can anyone tell me the part number ?
    Many thanks
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