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ChrisW
Firing on two.
Joined: February 21st, 2012, 9:01 pm Posts: 1136 Location: Avranches, Sud Manche, France
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 Speedo vs GPS
My wife is always complaining that I drive the Dyane too fast against the other vehicle she sometimes travels in my working van a Citroen Jumper/Relay. So yesterday on the way to a job I set the GPS unit to read speed and I was shocked to see that when the van speedo said 100kph the GPS ws only reading 85kph. So today I took the Dyane for a 200km drive and took the GPS out of the van to check the Dyane speedo and when the speedo was reading 100kph the GPS was reading 104kph............ The van is as it came out of Mr Citroen factory a few years ago with correct size tyres etc. so a difference of 15kph below the true speeds seems crazy.. If the GPS is correct I will have to drive slightly below the speedo speed especially in town as 50kph on the speedo is 52kph on the GPS. The long and short is my wife was correct.... 
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March 23rd, 2013, 6:31 pm |
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banjo
Firing on two.
Joined: June 5th, 2009, 9:17 am Posts: 747 Location: Staffs & France
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 Re: Speedo vs GPS
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March 23rd, 2013, 6:52 pm |
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ChrisW
Firing on two.
Joined: February 21st, 2012, 9:01 pm Posts: 1136 Location: Avranches, Sud Manche, France
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 Re: Speedo vs GPS
I have passed many speed signs on the side of the road (the one that gives you nice face and speed if under or sad face and flashing red speed if over) in the Dyane and they are very close to the speed I see on my speedo. There is a new one in a village near me (saw today for first time) and it read 49kph and I looked down and it was roughly just below 50 on speedo. I will check in the van next week what that says.
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March 23rd, 2013, 7:27 pm |
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Tripyrenees
Firing on two.
Joined: December 17th, 2012, 10:03 pm Posts: 966 Location: Luscan, Pyrenees, FRANCE
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 Re: Speedo vs GPS
The GPS is generally correct. My van reads about 5 kph to fast but I kinda like that as I see my 75 kph top speed (when it is only 70). We have a radar speed indicator coming into our village - I was doing 31 kph on the sole yesterday. But on my road bike I can top it out over 50 before I have to turn.... need more solex power And when I say GPS I am talking about the one on my road bike not a car unit.
_________________ https://www.facebook.com/GNGLuscan
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March 23rd, 2013, 8:55 pm |
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lpgo
Firing on 1-2 Spark
Joined: November 8th, 2009, 5:42 pm Posts: 2847 Location: NL
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 Re: Speedo vs GPS
ChrisW wrote: The long and short is my wife was correct....  Nothing new here......... wifes are Always correct.....
_________________
Russell wrote: Hi Geo, you've been one of the sites biggest attractions in recent years. Russ
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March 23rd, 2013, 9:46 pm |
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staf
2CV Fan
Joined: February 26th, 2012, 5:33 pm Posts: 39
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 Re: Speedo vs GPS
lpgo wrote: ChrisW wrote: The long and short is my wife was correct....  Nothing new here......... wifes are Always correct..... Even when they are not correct...
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March 24th, 2013, 2:19 am |
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J-dub
Aircooled Idiot
Joined: April 24th, 2010, 10:01 am Posts: 5733 Location: Location Location
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 Re: Speedo vs GPS
The other halfs dad said to me first time i met them - always take the blame, because in the end itll be your fault anyway so save yourself some time.
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1988 2cv 652cc 1993 Toyota Hilux Surf 3000cc runs on Bio Diesel 2004 Toyota Landcruiser Amazon 4200cc runs on Bio Diesel 1998 Daihatsu Hijet 1300cc 2005 Susuki Bandit 650cc
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March 24th, 2013, 8:26 am |
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Sean
Firing on two.
Joined: April 22nd, 2009, 11:06 pm Posts: 3684 Location: Ecosse
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 Re: Speedo vs GPS
Im always RIGHT!
- unless She is Righter
_________________ Kissing the Lash
 "Any advice of a technical nature is given on the understanding that I've actually done this shit, not just read about it in D*lly club mag some time ago.
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March 24th, 2013, 10:04 am |
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Little Louis
Field Plougher
Joined: February 8th, 2009, 12:07 am Posts: 2357
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 Re: Speedo vs GPS
ChrisW wrote: The van is as it came out of Mr Citroen factory a few years ago with correct size tyres etc. so a difference of 15kph below the true speeds seems crazy..
There is usually around a 10% optimistic tolerance on speedos so 15kph is a little high but not un-expected.
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March 24th, 2013, 6:40 pm |
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richardmorris
Firing on two.
Joined: July 9th, 2009, 10:27 am Posts: 493 Location: Bagshot Park
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 Re: Speedo vs GPS
I've just come round a bit of the M25 at an indicated 70mph on the speedo which was 67 on the tomtom. 30 is spot on, indicated 40 about 38.
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March 24th, 2013, 7:12 pm |
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