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SteveTheLight
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Joined: Dec 23, 2005
Posts: 12
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 Posted: Fri Jan 20, 2006 6:28 am Post subject: |
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Does the speedo not vary with tyre wear and pressure?
Steve |
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andyjenkins
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Joined: Apr 02, 2005
Posts: 74
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| Posted: Fri Jan 20, 2006 6:43 am Post subject: Re: TomTom speed accuracy |
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| cfalz wrote: | | My TomTom reads a couple of miles slower than the speedometer in my car. That is consistant with the portable radar signs that I pass periodically that the police put out to remind you of how fast you are going. I've been impressed with the accuracy of the gps speed rating. :D |
Then you have a malfunctioning speedometer, and should have it fixed ASAP - its a legal requirement (MOT Failure defined by VOSA).
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peterc10
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Joined: Aug 21, 2005
Posts: 1761
Location: Kent, England
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| Posted: Fri Jan 20, 2006 12:55 pm Post subject: Re: TomTom speed accuracy |
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| andyjenkins wrote: | | cfalz wrote: | | My TomTom reads a couple of miles slower than the speedometer in my car. That is consistant with the portable radar signs that I pass periodically that the police put out to remind you of how fast you are going. I've been impressed with the accuracy of the gps speed rating. :D |
Then you have a malfunctioning speedometer, and should have it fixed ASAP - its a legal requirement (MOT Failure defined by VOSA). |
Err ... think that you may have that the wrong way round.
If the TT reads a couple of miles an hour slower then the speedo is reading too high. As others have said the regs allow speedos to read up to 10% too hign (but not too low at all) |
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andyjenkins
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| Posted: Fri Jan 20, 2006 2:09 pm Post subject: Re: TomTom speed accuracy |
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| peterc10 wrote: | | andyjenkins wrote: | | cfalz wrote: | | My TomTom reads a couple of miles slower than the speedometer in my car. That is consistant with the portable radar signs that I pass periodically that the police put out to remind you of how fast you are going. I've been impressed with the accuracy of the gps speed rating. :D |
Then you have a malfunctioning speedometer, and should have it fixed ASAP - its a legal requirement (MOT Failure defined by VOSA). |
Err ... think that you may have that the wrong way round.
If the TT reads a couple of miles an hour slower then the speedo is reading too high. As others have said the regs allow speedos to read up to 10% too hign (but not too low at all) |
Oh aye .. sorry ! Thats what I get for posting at stupid times of the morning.
I'm getting my coat. 
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peterc10
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| Posted: Sat Jan 21, 2006 12:31 am Post subject: |
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| I know the feeling |
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Etwell
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Joined: Nov 02, 2003
Posts: 67
Location: EU.
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| Posted: Sat Jan 21, 2006 12:57 am Post subject: |
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With regard to the 10% error that several people have mentioned here.
The error is allowed at 30MPH where the shown reading can be up to 10% over 30mph but not below.
This means that at higher speeds the error will in fact increase.
So at a true 30mph your speedo may show 33mph, whilst at 70 it may show 75 or more.
The GPS speed is likely to be the more accurate. |
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Robin2
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Joined: Nov 24, 2003
Posts: 1441
Location: Swansea
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| Posted: Sat Jan 21, 2006 10:46 pm Post subject: |
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I refer you to my post of Jan 14 in this thread
Robin
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