"Michael Heiming" <michael+USENET@www.heiming.de> wrote in message
> In alt.autos.ford.focus Donald Gray
> > On Mon, 30 May 2005 15:08:00 +0000 (UTC), "Mark Allen"
> > <email@example.com> wrote:
> >>"David D" <firstname.lastname@example.org> wrote in message
> >>> Does anyone have any ideas as to why my 2004 2.0 Ghia is slower than
> >>> 1999 2.0 Ghia I traded in - (UK Car)
> > 
> >>Assuming that there are no actual faults affecting performance, the two
> >>things that initially spring to mind are either a relatively tight,
> >>low-mileage engine (if applicable?) or a more accurate speedo -
> > 
> > Or a less accurate speedo - I just got a GPS system - I used it in a
> > 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.
> Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
> mail: echo email@example.com | perl -pe 'y/a-z/n-za-m/'
> #bofh excuse 360: Your parity check is overdrawn and you're
> out of cache.
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)