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Speedo - accurate?
KaDargo
 

Posts: 262
Joined: May 2011
Location: West Sussex
Post: #1
Speedo - accurate?

2 questions

1 - Has anyone done a proper check on how accurate the speedo really is?

2 - Does anyone use the analog dial - both my wife and myself find ourselves just using the digital readout.

SD4 Prestige, Mauritius, Element, Cirrus Headlining, Pana Roof, Park Assist, Heated Steering Wheel,Blind Spot monitor, 20" Alloys, Powered Tailgate
17-08-2012 11:13am
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ED209
 

Posts: 1,128
Joined: Aug 2011
Location: durham
Post: #2
RE: Speedo - accurate?

It will read over, the same as all cars do.

td4 Pure manual in orkney grey, auto wipers/lights, front fogs, spare wheel. carmats4u mats, travall dog guard. Collected 30/03/12.
17-08-2012 11:22am
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Zesty314
 

Posts: 42
Joined: Jun 2012
Location: Heywood
Post: #3
RE: Speedo - accurate?

You could check quickly using a tomtom etc. Both our Kuga and C70 show 74 at a real 70.

Cheers

Mark H

Delivered Nov 12: 5 door Pure SD4 Auto, OG with black contrast roof, almond/espresso interior, 20 inch black style 6 wheels, fogs and privacy....oh and a real spare.
17-08-2012 11:48am
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PhilSkill
 

Posts: 3,880
Joined: Jun 2011
Location: Warwickshire
Post: #4
RE: Speedo - accurate?

All cars generally read 4-5% fast by design,Hence 74 at 70 (actually 73.5 is 5%).

I find use the analog dial during normal driving, but look at the digital around speed cameras.

MY12 Fuji Dynamic SD4 Manual, Pano Roof, Electric Tailgate with own Close module
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17-08-2012 12:03pm
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Token
 

Posts: 443
Joined: Aug 2011
Location: Cheltenham
Post: #5
RE: Speedo - accurate?

Mine is 6% over.

Only use the digital readout, no need for Analogue...

Evoque Coupe 2.2 SD4 Dynamic LUX 190HP (in some kind of grey!)



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17-08-2012 12:18pm
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PhilSkill
 

Posts: 3,880
Joined: Jun 2011
Location: Warwickshire
Post: #6
RE: Speedo - accurate?

It's designed in to allow a tolerance for wheel/tyre differences and tyre wear (tyre wear can account for around 2% difference, gearbox/driveline differences etc on different models and options. This avoids ever selling a car that underreads and so causes an unsuspecting customer to get a speeding ticket because of the car speedo.

Imagine the litigation that could come back on a car company if that were to ever be proven, e.g if every Ford Mondeo owner that got a speeding ticket could suddenly blame the car manufactuer and claim costs!

MY12 Fuji Dynamic SD4 Manual, Pano Roof, Electric Tailgate with own Close module
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17-08-2012 12:41pm
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Barneyridge
 

Posts: 715
Joined: Aug 2011
Location: Sydney
Post: #7
RE: Speedo - accurate?

I checked against my iPhone GPS and the speedo was within 2 kph.

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18-08-2012 10:23pm
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Sensorian
 

Posts: 43
Joined: Feb 2012
Location: Manchester
Post: #8
RE: Speedo - accurate?

(18-08-2012 10:23pm)Barneyridge Wrote:  I checked against my iPhone GPS and the speedo was within 2 kph.

You might as well have checked it with a windsock Laughing

Dynamic Barolo Black, Black interior, Panoramic roof, plus pack, style 6 wheels, Meridian upgrade
19-08-2012 06:57am
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Urban Splash
 

Posts: 487
Joined: Jan 2011
Location: North East
Post: #9
RE: Speedo - accurate?

I just use the digital readout. It would be great if you could make the speed reading bigger..

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19-08-2012 09:58am
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Cedric
 

Posts: 213
Joined: Jan 2012
Location: Belgium
Post: #10
RE: Speedo - accurate?

(18-08-2012 10:23pm)Barneyridge Wrote:  I checked against my iPhone GPS and the speedo was within 2 kph.

52kph = 50 actual speed
73kph = 70
124 = 120

There is also some kind of tolerance on the speed cameras in Belgium. So I can drive around 130kph on the speedo without getting a ticket (120 allowed). Most people drive around 120 on the speedo to avoid getting tickets, which gives me a comfortable speed to overtake them. Unfortunately that speed also explains my poor mpg, but I like driving at this speed.
19-08-2012 10:05am
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