In article ,
whisky-dave wrote:
On Tuesday, 29 September 2015 13:26:18 UTC+1, Dave Plowman (News) wrote:
In article ,
brightside S9 wrote:

Manufacturers will normally deliberately calibrate their speedos to
read 'high' by some amount between 100% and 110% to keep themselves
within the law.

It also means the car shows a higher top speed than reality. Better MPG.
And needs servicing more frequently. So a win win win for the makers.

In these days of pulse counting speedos, there is no need for the same
sort of tolerance as once. Only thing which will effect the reading is
tyre wear - which makes it read on the 'safe' side anyway.

No the thing that effects the reading is the software and the digits
it chooses to show on the display.
I thought VW emissions reading will have taught everyone that.
So whatever a car says it's doing means little.
It can't be that difficult to fudge speedometers to under read.

The police should use their methods of reading speed which should be
checked and calibrated regualry.

To the best of my knowledge, they are. The Speedwatch kit we use is checked
against an external reference every time we use it.

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