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I was just thinking....

Discussion in 'General Chat' started by jojo, Sep 20, 2007.

  1. jojo

    jojo Looking for Boost!
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    ....with regards to the 10% out rule on our speedometers. If the speed is approx. 10% out, then is the mileage 10% out, since the the signal for the odometer is likely to be the same one as the speedo right? So a car that has travelled 11k miles, could actually be infact a 10k miles car, no?!
    This in effect would have ruined my mpg figures I've been calculating for the last few years also, so anyone else got an opinion on this? :jump:

    Now where did I puy my medication? :tocktock:
     
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  3. dummi

    dummi smoking a6

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    in a word "yes"
     
  4. rickparmar

    rickparmar va va voom

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    stop thinking
     
  5. Randomjim

    Randomjim Active Member

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    Or 12.1k miles :ohmy:
     
  6. silver75

    silver75 Big Ron

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    .
     
  7. marriedblonde

    marriedblonde Active Member

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  8. jojo

    jojo Looking for Boost!
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    Of course MB, but if the car is 10% out, if you have done 10kmiles, the ODO will read 11k!(Plus 10%) :moa:
     
  9. Markey

    Markey Active Member

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    It makse sense but not what i wanted to read on a friday afternoon as my head hurts....
     
  10. joost

    joost Active Member

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    ...Only made worse by wheels that throw the speedo reading out even further...
     
  11. jcs356

    jcs356 Brum brum

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    You've got to include the tyre wear in the calculation - wearing down from 8mm tread to 2mm will alter the wheel circumference and make it over read even more....
     
  12. joost

    joost Active Member

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    Look what you've started now Joe!
     
  13. AndyMac

    AndyMac Moderator
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    No the over reading is calibrated into the speedo itself not the speed sensor, i.e. if you sit at a constant 70mph on the motorway, then reset the trip computer to show average mph, it'll actually show you a lower more accurate reading, so the mileage is pretty accurate, only affected by incorrect wheel/tyre size.
     
  14. fjtwelve

    fjtwelve Moderator
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    My satnav said 142 when my speedo said 146 so the regs may say you've got 10% but in fact your speedo is probably more accurate than that. Bloody Germans and their engineering, it has to be right. Even my FJ12 clocked 496 miles and the sat nav said 487, and thats a 1988 model with a cable driven speedo off the front wheel.
     
  15. jojo

    jojo Looking for Boost!
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    Mine would be more accurate then, I'm running 19s :cool:
     
  16. jojo

    jojo Looking for Boost!
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    Now we are talking, more factors to look out for - get in there! :)
     
  17. jojo

    jojo Looking for Boost!
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    Just to make this thread last a bit longer Andy, IS THAT A FACT?
     
  18. jojo

    jojo Looking for Boost!
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    So in 496 miles, you spent 13 or them wheel spinning or doing doughnuts(or is it donuts?)?
     
  19. AndyMac

    AndyMac Moderator
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    No I just made it up!
     
  20. bravepilot

    bravepilot Member

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    Jojo, if you're worried about it, you should use the Honda Jazz that you have more often! My Audi is 5mph out, but the Jazz is spot on! :respekt:
     
  21. fingermouse

    fingermouse thats me

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    see you lot thinking again now would this effect that plane taking off
     
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  23. jojo

    jojo Looking for Boost!
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    LOL! It's my Honda Jazz that got me thinking, as it's an Import model called a Honda Fit! It has some kind of chip thing at the back of the clock to reduce the KM signal into MPH signal, but it's still a good 10% out, as I was following the missus at a constant 70mph on her speedo, but mine was around the 77-78 mark, tried it at 80ish also, and still 10% out!
     
  24. TDI-line

    TDI-line Uber Post Whore
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    Don't forget about the extra weight your car carries Joe. ;) :)
     

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