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clocks overeading
- Thread starter luke c
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- clocks overeading
There is a variation....Fords are worst for this.
I took a TomTom in my old Mini once and at the top end it was reading 7-8mph different - my speedo being quicker.
Its normal I'd have thought....
The regulations give the limits that the speedo accuracy must achieve. If I remember correctly, they must not under-read, but they're allowed to over-read by something like 10%.
So many manufacturers err on the side of caution and deliberately design them to over-read - and some do seem to over-read by almost the allowed 10%.
So many manufacturers err on the side of caution and deliberately design them to over-read - and some do seem to over-read by almost the allowed 10%.
Yep, the error is a percentage of the real speed, rather than a fixed amount.
Varies from car to car, I found my Ibiza to be almost bang on, whereas the Rover I had before did overread by 10% (as did the mileage, quite a significant amount given the high mileage I did).
mate put his navman in my cupra the otherday, 2mph out at 140mph. Very pleased with that. His vxr reads 9mph out at same speed
I think the worst I've seen is a friend's Clio reading 120mph even though it's a 1.2 and has a top speed of about 100mph! Some fool also said his Fiesta 1.8D with a top speed of 96mph got upto 140 on the motorway
....I said put satnav in it and then see what speed you're going!
....I said put satnav in it and then see what speed you're going!
my speedo said i was doing 130 the other day lol i thought not bad but i knew it wasnt right lol does go quicker with my k&n and cupra intake tho 
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