oceansoul
Member
Registered: 19th Jun 06
Location: Sunbury, Surrey
User status: Offline
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Is the speedo in the dash or the sat nav more accurate?
Only ask as my sat nav is exactly 5 MPH faster than my dash, and theres this new set of roadworks on a 50mph dual carrigeway near me, and they dropped the speed limit to 30mph and have average check cameras. So i have to drive at 30mph (on dash), but it just seems soooo slow, and i get people up my arse and overtaking. So am i actually driving at 25 in the roadworks and my dash is 5MPH out all the time.
Car is 2002 suzuki Grand Vitara, BUT IM GETTING BACK TO VAUXHALLS SOON =]
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JoeyB
Member
Registered: 19th Jun 03
Location: Fareham HANTS, Drives: Astra Coupe Turbo
User status: Offline
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The Sat Nav will be more accurate.
If your dash is reading 30mph and your Sat Nav is reading 25mph then you are doing 25mph.
Car speedometers are set from factory to over read...when you get nearer 100mph they are around 10% out.
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Kurt
Member
Registered: 23rd Oct 05
Location: Hi
User status: Offline
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wheels can throw the speedo out on some cars too.. its down to a higher rolling radius
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Ste L
Member
Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
User status: Offline
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speedo's always read slower, even from the factory...
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oceansoul
Member
Registered: 19th Jun 06
Location: Sunbury, Surrey
User status: Offline
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although by 5MPH?? at slow speeds?
Think the wheels are std, there huge thats all i know
I remember my Corsa was out by only 2 or 3 and got up to about 7 or 8 at 100MPH + (not that i ever drive that fast  well not in the 4x4 anyway)
[Edited on 29-05-2008 by oceansoul]
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Ste L
Member
Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
User status: Offline
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quote:
Originally posted by oceansoul
although by 5MPH?? at slow speeds?
Think the wheels are std, there huge thats all i know
I remember my Corsa was out by only 2 or 3 and got up to about 7 or 8 at 100MPH + (not that i ever drive that fast well not in the 4x4 anyway)
[Edited on 29-05-2008 by oceansoul]
yea, usually under read by about min 5%, if not more..
the fast you go, the more inaccurate they are..
eg in my corsa, at 78mph(dials) = 70mph(real speed)
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