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Donald Gray
Putting ODCOMBE on the Global Village Map!
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In alt.autos.ford.focus Donald Gray <donald@safetypin.odcombe.demon.co.uk>:
>>> Does anyone have any ideas as to why my 2004 2.0 Ghia is slower than the
>>> 1999 2.0 Ghia I traded in - (UK Car)
> []
>>Assuming that there are no actual faults affecting performance, the two
[quoted text clipped - 4 lines]
> Merc and checked the speedo on the motorway - It compared spot on with
> the Merc.
> In my 2 year Focus 2L Ghia, the speedo reads 34 when the gps tells me
> that I am doing 30. The speedo consistently is 'fast' compared with
> the GPS.
> I tend to believe in the cesium clocks on the GPS than the speedo on
> the car. HOWEVER, I use the car speedo if a police car tailing me!!!
Exactly, GPS should be correct concerning speed withing +/- 0.1
km/h. The speedo on my Focus shows about +5% more then GPS, a
pretty good value for some Ford speedometer. In addition it has
the annoying feature that it stops shortly before 220 km/h, while
revs are still going up.

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Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
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Mark Allen - 04 Jun 2005 09:32 GMT
> In alt.autos.ford.focus Donald Gray <donald@safetypin.odcombe.demon.co.uk>:
>
[quoted text clipped - 22 lines]
> the annoying feature that it stops shortly before 220 km/h, while
> revs are still going up.
GPS vs. speedo comparison is similar in my experience too - speedo reads
4mph fast at all legal speeds compared to GPS, indicating it is actually a
pretty accurate unit with an in-built over-read that remains consistent. As
an aside, my GPS reads identically to these flashing roadside speed signs
that seem to be proliferating in this neck of the woods.
Just to clarify my earlier comments with regard to the OP, the more accurate
speedo reasoning relates to the newer car - if the one in the old car
over-read a lot and the one in the new car over-reads less, then this could
give the OP the impression that the new car is slower over his chosen
performance test (especially if the new car is also a bit quieter and
smoother to drive than the old one too)
Josef Erbs - 04 Jun 2005 10:44 GMT
Mark Allen schrieb:
> GPS vs. speedo comparison is similar in my experience too - speedo reads
> 4mph fast at all legal speeds compared to GPS, indicating it is actually a
> pretty accurate unit with an in-built over-read that remains consistent. As
> an aside, my GPS reads identically to these flashing roadside speed signs
> that seem to be proliferating in this neck of the woods.
Hi
I don´t know about the law in the USA, but here in Germany a speedo is
only allowed to over-read the real speed by about 10% of the max. speed
indicatable, but not a bit slower then the right speed.
This leads to speedos with a over-read of about 2-10 km/h, bad ones
until 15-20 km/h. About 5 is normaly.
bye
Jupp
Alan - 04 Jun 2005 12:36 GMT
>The speedo on my Focus shows about +5% more then GPS
While travelling on a straight road and at constant speed the GPS always
reports a road speed that is 10 percent below that reported by my 2001
UK (Geman) Focus speedometer (over the range 30 to 80 miles per hour)

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Alan
mailto:news2me_a_2003@amacleod.clara.co.uk
Michael Heiming - 04 Jun 2005 13:53 GMT
In alt.autos.ford.focus Alan <junk_news_a@amacleod.clara.co.uk>:
>>The speedo on my Focus shows about +5% more then GPS
> While travelling on a straight road and at constant speed the GPS always
> reports a road speed that is 10 percent below that reported by my 2001
> UK (Geman) Focus speedometer (over the range 30 to 80 miles per hour)
A bit much, perhaps you have mounted another wheel/tire
combination then your Focus is programmed? Can be adjusted from
your Ford dealer.

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Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
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Alan - 04 Jun 2005 14:06 GMT
>In alt.autos.ford.focus Alan <junk_news_a@amacleod.clara.co.uk>:
>
[quoted text clipped - 6 lines]
>A bit much, perhaps you have mounted another wheel/tire
>combination then your Focus is programmed?
Standard Ford wheels and recommended size of tyres (same brand/model of
tyre as originally fitted to car)

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Alan
mailto:news2me_a_2003@amacleod.clara.co.uk
Thorsten Gartung - 09 Jun 2005 22:18 GMT
>>>>The speedo on my Focus shows about +5% more then GPS
>>
>>> While travelling on a straight road and at constant speed the GPS always
>>> reports a road speed that is 10 percent below that reported by my 2001
>>> UK (Geman) Focus speedometer (over the range 30 to 80 miles per hour)
I think it's ok, my german Focus' speedometer shows more km/h than i'm
really driving. I measured it and the speedometer shows ca. 7 km/h more
than I'm actually driving.
Michael Heiming - 09 Jun 2005 23:00 GMT
In alt.autos.ford.focus Thorsten Gartung <thgartung@spammy.gmx.de>:
>>>>>The speedo on my Focus shows about +5% more then GPS
>>>
>>>> While travelling on a straight road and at constant speed the GPS always
>>>> reports a road speed that is 10 percent below that reported by my 2001
>>>> UK (Geman) Focus speedometer (over the range 30 to 80 miles per hour)
> I think it's ok, my german Focus' speedometer shows more km/h than i'm
> really driving. I measured it and the speedometer shows ca. 7 km/h more
> than I'm actually driving.
Depends, at least with my Focus on the speed:
speedometer 100 km/h - GPS 95 km/h
speedometer 200 km/h - GPS 190 km/h
(Sadly speedometer simply stops short before 220 km/h)
Anyway looks like +5%, wouldn't really care about the 10%, but
his dealer should be able to check if the tire dimension mounted
is programmed correctly, if he's curious.

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Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
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