WJBertrand
Ventura Highway
Seems like Yamaha has regressed as my '15 is only 1-2 MPH off.RicoChet said:
News from 12oClockLabs plug&play ES speedometer healer
- Thread starter klingklang
- Start date
fredz43
Well-Known Member
Founding Member
2011 Site Supporter
2012 Site Supporter
2013 Site Supporter
2014 Site Supporter
As I posted above USA Gen 2 bikes speedos are very accurate. Others are still as inaccurate as all Gen 1's.
Please keep this thread to 12 o'Clock Labs. We have plenty of other threads we can resurrect about speedo error and why it exists.
(See Post 38 here: http://www.yamahasupertenere.com/index.php?topic=1485.msg102196#msg102196)
Thanks
(See Post 38 here: http://www.yamahasupertenere.com/index.php?topic=1485.msg102196#msg102196)
Thanks
spinalator
Member
Sorry to resurrect this old thread, but I am still wondering if anyone has heard anything? My inquiry was almost a year ago now. TIA
Cycledude
Well-Known Member
Sorry but that link ain’t much help. According to my GPS The speedometer on on my 2013 usually read 5-6 mph fast, the speedometer on my new 2018 usually reads 1-2 mph fast and that’s plenty accurate enough for me. Now that I have cruise control I don’t have to worry nearly as much about watching my speed.
dannyv
Active Member
Remember the GPS indicated speed can be off a bit too. Especially with heavy tree cover (or tunnels). It is just a calculated average.
I'll toss another monkey wrench out here- is the odometer in sync with the speedometer? i.e., if your Gen one bike is off a bunch, is the indicated mileage off too? From my rally days- I could make very close approximations of checking both accuracy of speedo and odo, by using the mile markers on the interstate, and a stop watch. Drive at an indicated 60 mph. Now time how long to cover ten miles on the interstate, being very careful to hold your speed steady. (did it take exactly 10 minutes?) Then, using your odometer (interpolating to 1/100 of a mile as best you can) see what your bike measures for the next ten miles of markers. I know most of my cars are off a fair amount, on both measurements. My bike is off too, knowledge gained from warning radar signs.
I'll toss another monkey wrench out here- is the odometer in sync with the speedometer? i.e., if your Gen one bike is off a bunch, is the indicated mileage off too? From my rally days- I could make very close approximations of checking both accuracy of speedo and odo, by using the mile markers on the interstate, and a stop watch. Drive at an indicated 60 mph. Now time how long to cover ten miles on the interstate, being very careful to hold your speed steady. (did it take exactly 10 minutes?) Then, using your odometer (interpolating to 1/100 of a mile as best you can) see what your bike measures for the next ten miles of markers. I know most of my cars are off a fair amount, on both measurements. My bike is off too, knowledge gained from warning radar signs.
I put a speedohealer on my 13 model when it was almost brand new. It always reads within 1mph of the gps. I didn't check the odometer when the bike was stock, but with the SH the odometer reads 3% low. 100 miles on the odometer = 103 miles on the gps. May have been better or worse when stock, I don't know.
jbrown
Active Member
The speed reported by a GPS reveiver is very accurate as long as a clear path to a few satelites exists. GPS speed is calculated from the doppler shift of the GPS signal. It does not do the distance traveled / time calculation because the GPS position is not accurate enough. The satellite signal frequency control mandated by government standards is very accurate, allowing for .006 m/sec speed measurement (about 0.013 MPH). Lower accuracy references in GPS receivers will generally put the expected accuracy in the low tenths of a MPH. If you have a stable signal at all, you should expect to be within 1 MPH.
So jbrown, are you saying that the distance measurement on the gps will not be correct? I know that I have ran some certified races and my Garmin watch always reads longer than the certified race distance. I know you have to account for running wide in curves and around corners as the certified distance cuts the inside of all corners and is the shortest route on the course. I've done some straight line runs with almost no curves and the watch always reads a longer distance. Next time I'm out on the interstate I'll check the odometer and the gps against a ten mile run with mile markers and see which one is the closest.
Nikolajsen
"Keep it simple"
In a straight line, there wil not be a great difference.
It is in the curve the GPS meassure different, due to the straight line between the meassure point on GPS.
But have a lot to do with the software on GPS
"a little later"
https://www.singletracks.com/blog/mtb-gear/do-gps-units-always-overestimate-trail-distances-no/
It is in the curve the GPS meassure different, due to the straight line between the meassure point on GPS.
But have a lot to do with the software on GPS
"a little later"
https://www.singletracks.com/blog/mtb-gear/do-gps-units-always-overestimate-trail-distances-no/
Curves, hills, varying speed, and tree cover can all alter GPS results. So can other electronic items on the bike or nearby.
Longdog Cymru
Well-Known Member
My Gen 2 is doing 74mph when the Speedo is reading 80-81mph according to my Garmin satnav and yes, it is still on the originalBridgestone tyres. By the way, my previous bike, a Kawasaki Versys 1000 read exactly the same.