Thread: speed accuracy?

Believe the GPS. Speedos must always read higher than the actual speed by law.

Sent from my SM-G900I using AULRO mobile app

Our Toyota vans generally show speed on dash around 5 % higher than actual.

Thanks Guys,
Think i'll run it by the dealer and see if anything can be done.

Fossicker,
Did you get any joy from the dealer?
My new DS MY17 reads 64 when the GPS tells me 60. My understanding of the ADR is that the speedo is not allowed to read low, but must read no more than 10% high. My previous car (Audi) read 101 at 100kph and proportional at lower speed, so accuracy is possible.
The other interesting thing is that, according to the manual, Lane Departure Warning is active above 60kph. In my car it activates when the speedo says - you guessed it - 64kph. Coincidence? Don't know. Has anyone else seen this?
Roman

Originally Posted by Romeo

Fossicker,
Did you get any joy from the dealer?
My new DS MY17 reads 64 when the GPS tells me 60. My understanding of the ADR is that the speedo is not allowed to read low, but must read no more than 10% high. My previous car (Audi) read 101 at 100kph and proportional at lower speed, so accuracy is possible.
The other interesting thing is that, according to the manual, Lane Departure Warning is active above 60kph. In my car it activates when the speedo says - you guessed it - 64kph. Coincidence? Don't know. Has anyone else seen this?
Roman

That is correct. The car knows the correct speed and distance and the settings in the configuration file increases the displayed speed by a certain amount, which can be adjusted in the configuration. On the D4 it is 2kph + 3.5% from what I can gather. I don't know what it is for a DS yet.


On my ex VW Multivan the speed was even more optimistic than the DS but the DS seems to be pretty similar to the D4.

I wouldn't worry. I have never owned a car that showed accurate speedo reading. It was always off by upto 10% higher than the actual speed you are doing.

Bob

"...The car knows the correct speed and distance and the settings in the configuration file increases the displayed speed by a certain amount, which can be adjusted in the configuration..."

I'm new to this. Where can I found out more about this "configuration file" and can I/how do I see it or tweak it?

I'm unashamedly one of those people who don't appreciate big brother pretending I'm going faster than I am - I have a wife for that. Give me the info and let ME deal with it, not some *** who thinks he knows better

Roman

As far as I know we can't access the CCF yet as no one has made a diagnostic tool for the DS. I assume that the GAP IID BT tool will read it in the future as it does for most other Land Rover products, including the Evoque and the Freelander. When it does, you will be able to adjust the CCF as you can on the D4, for example. I will then add it to my existing D4 license for the tool.