Johnnylane
Moderator
I took my Tom Tom out to determine the error in the speedometer ('08). I read the Tom Tom at three indicated speeds, 20, 40, and 60 mph. The Tom Tom gave me 18, 36, and 54 mph. That's an 11% error, low.
Speedometer Error
- Thread starter Johnnylane
- Start date
jlewis02
Moderator
If you changed the gearing any it will be off alot even stock they are off some.
Get you a speedo healer.
Get you a speedo healer.
Johnnylane
Moderator
That is stock.
I'm playing with it because I am installing a SH. The data allows the calculation of the correction factor.
I'm playing with it because I am installing a SH. The data allows the calculation of the correction factor.
Steve F
Well-Known Member
Johnny
That's interesting. I thought the speedometer error was such the bike usually reads higher than true speed. I thought I saw that somewhere, but I'm not sure now.
FWIW, yesterday I went past one of those electronic signs that say, "Speed Limit Is 25. Your Speed is XX." It said I was going 32 which agreed exactly with my speedometer. The same sign agrees with my car at about the same speed.
I have a Tom Tom too, but I use it in the car only. How do you mount it to the bike? I've been having fun lately just getting lost on some the the back roads here in NJ that I never knew where they lead. I'm sure to get lost soon so having the Tom Tom to get me home would be great. Especially at twilight. I'm turning 50 soon. My eyes at night aren't what they used to be. Glare is a big problem. So getting home before darkness quickly via Tom Tom would be a nice thing to have. Soon the days will be getting shorter-arghhh!
Ride safe all!
That's interesting. I thought the speedometer error was such the bike usually reads higher than true speed. I thought I saw that somewhere, but I'm not sure now.
FWIW, yesterday I went past one of those electronic signs that say, "Speed Limit Is 25. Your Speed is XX." It said I was going 32 which agreed exactly with my speedometer. The same sign agrees with my car at about the same speed.
I have a Tom Tom too, but I use it in the car only. How do you mount it to the bike? I've been having fun lately just getting lost on some the the back roads here in NJ that I never knew where they lead. I'm sure to get lost soon so having the Tom Tom to get me home would be great. Especially at twilight. I'm turning 50 soon. My eyes at night aren't what they used to be. Glare is a big problem. So getting home before darkness quickly via Tom Tom would be a nice thing to have. Soon the days will be getting shorter-arghhh!
Ride safe all!
stonesie
Well-Known Member
i think its less teeth gives you a higher than normal speed reading and more teeth less .(thats teeth on your drive sprocket)
Scuba
Member
MC speedometers are notorious for being inaccurate...usu between 5-10%. My FJR is off about 5% and my FZ1 was off about 10%.
Grommit
Well-Known Member
The speedo should read between 0-10% high. The manufactures calculate it slightly differently but it should never read low.
Johnnylane
Moderator
I just stuck it in the clear top pouch of my tank bag. Believe me, it reads easier than it really was. Find a place with some distance between traffic, hold the speed constant, and try and read the stupid Tom Tom's micro print.
drzsmrider
Member
speedo error
my 08 fz1 showed 74 at 70.3 by my garmin.and 126 at 120.about 5.3%error.it's stock.wonder how much %is allowed or does it matter to yamaha.
my 08 fz1 showed 74 at 70.3 by my garmin.and 126 at 120.about 5.3%error.it's stock.wonder how much %is allowed or does it matter to yamaha.
va_rider
Wizard
11% is a heck of a factory error! According to the speedohealer website, the average error is around 5%...