RedDogDarren
Well-known member
My bike reads 110 kph when in reality I am doing 100 kph exactly. Neat trick for everyone who says the odometer is correct when it gets its info from the speedo as a package. My bike has stock gearing.
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Motorcycle Speedo" never right!
- Thread starter Vroom
- Start date
GSXMAER
Well-known member
your friend knows what he's talkin about.....the GPS has a lag time....going up to space and all the way back down...
its NOT light speed.....so its off....only the gps units for aircraft are accurate...you get what you pay for
everyone go out on the highway.....pace any car on your right that you can see the big LED speedo at 100kph....
you have to match their speed...takes a bit of time....and see what you get
my bikes have always read exactly what the car is doing....
gps is off....the faster you go.....
at 300.....the gps reads about 5 to 7 klm behind....so im like at fuitland rd...but the gps says I'm at centenial....and the speed says 260
yet cops have got me at 270.....when I was doing 270....so bikes speedo's are correct
go out and find YOUR own answers......
its NOT light speed.....so its off....only the gps units for aircraft are accurate...you get what you pay for
everyone go out on the highway.....pace any car on your right that you can see the big LED speedo at 100kph....
you have to match their speed...takes a bit of time....and see what you get
my bikes have always read exactly what the car is doing....
gps is off....the faster you go.....
at 300.....the gps reads about 5 to 7 klm behind....so im like at fuitland rd...but the gps says I'm at centenial....and the speed says 260
yet cops have got me at 270.....when I was doing 270....so bikes speedo's are correct
go out and find YOUR own answers......
TheDirty
Well-known member
No signal goes up to the satellite so your entire premise is incorrect. It tracks entirely by syncing signals from multiple satellites.
The GPS is correct.
That ^
Here are a couple of links a good simple read:
http://electronics.howstuffworks.com/gadgets/travel/gps.htm
http://gpssystems.net/accurate-gpsbased-speedometer/
http://electronics.howstuffworks.com/gadgets/travel/gps.htm
http://gpssystems.net/accurate-gpsbased-speedometer/
May I add that yes, GPS reads "behind", but the more you stay at constant speed, the more accurate it becomes. So, 5-10 seconds at constant speed will read a quite accurate value on the GPS, and the more you stay at that speed, the more the error will be disappearing and approaching zero.
Does this just piss off me, or does anyone else find it annoying that your speedo is usually reading 5km or more faster than your going! (Compared with what a GPS shows you doing) I would tend to trust the GPS! Come on---- its electronic, how hard is it to program in tire rotations per km to get it right! Thats how you get it right in a transport truck--each tire manufacturer lists each one of their tires rev/per km. You just enter that in the computer and wa-la, right speed. Now it will vary a bit with tire wear, but is reasonably close! Do the bike manufactures not give their service people at the dealerships access or do they just not care!!! (After you have spent in some cases as much as a car would cost you) Anyone have an answer--maybe you can??
I made a complaint to my dealership but couldn't get a straight answer from them. I later found that there is a way to correct this. But like everything else comes at a cost. You can buy what's called a "SpeedoHero" made by HealTech. It costs around $150 and its a plug-and-go little device. I can give you the link if you're interested.
Speedos show, on average, 10% faster than your actual speed. In some cases more.
It's called SpeedoHealer and I have it moved to a second bike already, works like a charm: www.speedohealer.com
Stephen W.
Well-known member
I suppose I shouldn't be surprised at the number of people who are not aware of "speedo error" with all types of vehicles. Not everyone grew up with a father like mine who, among many other things, rebuilt / recalibrated mechanical speedometers, (on the kitchen table). However it has been in the news over the years. The most recent to my knowledge was about a year ago when Subaru admitted that it's speedos where out 5% and so extended their 100,000 kilometres warranty to 105,000 kilometres. I think I had 123,000 on my STi when I got my letter. hehehehe
I have a Garmin GPS unit that I use as my speedo in the car.
My 900 SS FE has a cable drive off the front wheel so changing rear gearing makes no difference to the reading. As others have stated, I adjust my speed based on knowing it's optimistic 8 - 10%.
heheheheI have a Garmin GPS unit that I use as my speedo in the car.
My 900 SS FE has a cable drive off the front wheel so changing rear gearing makes no difference to the reading. As others have stated, I adjust my speed based on knowing it's optimistic 8 - 10%.
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