clocks overeading

[luke c]

today i went out and had my road angel in and have found that my clocks over read by 5mph this explains why i have been getting times to 60 in 7 secs as i am only doing 55 in second gear .is this a common problem with these cars or is it just mine .

 

[Ibiza 130 tdi]

today i went out and had my road angel in and have found that my clocks over read by 5mph this explains why i have been getting times to 60 in 7 secs as i am only doing 55 in second gear .is this a common problem with these cars or is it just mine .

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....

 

[Pigeon142]

This happens on a lot of cars they are setup to over read the speed you are doing. My FR does it but only by 2-3 MPH

 

[rashcupra]

cars are made to overread some more than others the faster you go the further out the speedo is!

 

[dmjw01]

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%.

 

[muddyboots]

the faster you go the further out the speedo is!

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).

 

[icemancupra]

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

 

[QuietQuackers]

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!

 

[RichieRich]

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