How did I do that!? Changing ODO from Miles to KM
Discussion
In the process of calibrating my speedometer and entering the correct number for my wheel size I have managed to change my odometer display from Miles to KM.
This is the gauge I am talking about: http://caterhamparts.co.uk/product.php?id_product=...
Instead of the 1800 odd miles I had on the clock, it now displays 2920.
There were 2 screens after going into setup and I ended up in the DTS... option. In the process of trying to get out of the screen I seemed to have changed the ODO display from miles to kms.
But I cannot work out how to change it back!
Anyone know this?
This is the gauge I am talking about: http://caterhamparts.co.uk/product.php?id_product=...
Instead of the 1800 odd miles I had on the clock, it now displays 2920.
There were 2 screens after going into setup and I ended up in the DTS... option. In the process of trying to get out of the screen I seemed to have changed the ODO display from miles to kms.
But I cannot work out how to change it back!
Anyone know this?
Edited by rotorwings on Friday 25th April 23:01
Ok, so now my ODO shows 12,000+ miles! That appears to be 10,000 miles driving in two days!
But at least I now know why.... (it was no 'miles to km' change as I thought)
What I had done was to exit the setup (dstppu) without setting anything (00000), then the speedo adds some crazy amount of miles for every METER travelled. Newbie mistake - make sure you don't accidentally reset it because zero apparently means something closer to infinity in this case.
Then before you know it I looked and saw 2900 miles on the odo. It seems it was just a coincidence that this was about 1.6 times the 1800miles I was expecting to see.
Trying to work out what the problem was this morning cost me another 9000+ miles!
Now the speedo needs to go back to Caerbont to be set back to 1800/1850 miles (which I really should be 1700ish miles because of the 10% over-read that was the problem in the first place, but hey-ho I'll stick with the 1850). Not the end of the world as one of the backlights had gone and needed fixing anyway.
But at least I now know why.... (it was no 'miles to km' change as I thought)
What I had done was to exit the setup (dstppu) without setting anything (00000), then the speedo adds some crazy amount of miles for every METER travelled. Newbie mistake - make sure you don't accidentally reset it because zero apparently means something closer to infinity in this case.
Then before you know it I looked and saw 2900 miles on the odo. It seems it was just a coincidence that this was about 1.6 times the 1800miles I was expecting to see.
Trying to work out what the problem was this morning cost me another 9000+ miles!
Now the speedo needs to go back to Caerbont to be set back to 1800/1850 miles (which I really should be 1700ish miles because of the 10% over-read that was the problem in the first place, but hey-ho I'll stick with the 1850). Not the end of the world as one of the backlights had gone and needed fixing anyway.
How do these electronic speedos take their reading? Wires running from the gauge to a sensor on the drive shaft or similar? I'm ideally after a KPH mechanical one but I'm looking into what it would take to get an electronic one up and running.
Sorry to not be of help to your problem though!
Sorry to not be of help to your problem though!
I believe the sensor is down at one of the rear wheels and is a hall effect sensor generating 43 pulses per wheel revolution.
Basically, all the speedo does is convert these pulses into a calculated speed and distance.
In the speedo you can enter the number of pulses per mile and the speedo will use this in its calculations.
The formula is:
(number of teeth on the sensor) X (number of revolutions of the wheel per mile) = pulses per mile.
In my case this worked out to be 43 X 920.3 = 39,573
This gave me a starting point, but the speedo was still reading nearly 10% over. So, I just added 9% to the number of pulses per mile and got 043140.
Now the speedo read exactly the same as my GPS.
Basically, all the speedo does is convert these pulses into a calculated speed and distance.
In the speedo you can enter the number of pulses per mile and the speedo will use this in its calculations.
The formula is:
(number of teeth on the sensor) X (number of revolutions of the wheel per mile) = pulses per mile.
In my case this worked out to be 43 X 920.3 = 39,573
This gave me a starting point, but the speedo was still reading nearly 10% over. So, I just added 9% to the number of pulses per mile and got 043140.
Now the speedo read exactly the same as my GPS.
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