Sat Nav v's Speedo - Yamaha FZ6 Forums - International FZ6 Motorcycle Community Forum

**Nelly** · 01-13-2008, 01:17 PM

Ok we or most of us would have seen some input on the "how fast is you FZ6" thread. You will also have seen a number of posts that mention speedo error. I was using my sat nav today to take my son to a football match. I thought I would check if my nav had an difference to my speedo.

Nav FZ6
18mph 20mph
26mph 29mph (For the life of me, I can't get my bike just to sit at 30mph)
36mph 40mph
56mph 60mph
66mph 71mph
76mph 84mph

I had eight satelites tracking me the whole time so it was a reasonable signal. There were a few seconds lag whilst my nav caught up or slowed down. My speedo was also slightly obscured by the nav as I was using the wind screen sucker. So I conclude yes the speedo is way out? or is it. The literature that came with my nav specifically specifies that it is not calibrated to be used as a speed measuring device. So how accurate is a civillian nav? I was always under the impression that there was quite a window of accuracy due to potential military applications. Maybe some of the military guys can answer this.
In one of the posts it has been mentioned that you can get a speedo corrector. What are they and how do they work?

Cheers
Neil

rgatling · 01-14-2008, 12:29 PM

Here's some info for you...

YellR, makers of the YELLOW BOX speedo recalibrator

madmanmaigret · 01-14-2008, 12:37 PM

why doesn't yamaha make this correction at the factory?
it seems like the speedo (based on neil's observations) is about 5mph off. does anyone know why?

**Nelly** · 01-14-2008, 12:49 PM

Quote:

Originally Posted by rgatling

Here's some info for you...

YellR, makers of the YELLOW BOX speedo recalibrator

Have you got one? Or has anyone every used one?

rgatling · 01-14-2008, 12:54 PM

Why are the speedos off? I don't know, but it is common on all modern bikes. Check any forum for any make/model and you'll read the same thing.

I have not used one on previous bikes, but have friends that have. It works as promised. If I change my sprockets, I'll buy one to adjust the speedo and odo.

**Nelly** · 01-14-2008, 01:06 PM

I think its because the speedo is run off of the engine and not the wheel? I don't fully understand it either.

madmanmaigret · 01-14-2008, 01:32 PM

so are most cars but this doesn't seem to affect them....and if that company can fix it im sure yamaha can also.

jeff in ohio · 01-14-2008, 01:55 PM

Motorcycle Consumer New tested the 2007 and reported a 4mph error at 65mph (going by memory here). The problem with your GPS is that it is calculating your rate of travel based on FLAT travel - not up and down hills. So with a non-flat terrain, you will have speed error with your GPS....

**Nelly** · 01-14-2008, 02:11 PM

Quote:

Originally Posted by madmanmaigret

so are most cars but this doesn't seem to affect them....and if that company can fix it im sure yamaha can also.

Very true, it just adds to the mystery?

**Nelly** · 01-14-2008, 02:15 PM

Quote:

Originally Posted by jeff in ohio

Motorcycle Consumer New tested the 2007 and reported a 4mph error at 65mph (going by memory here). The problem with your GPS is that it is calculating your rate of travel based on FLAT travel - not up and down hills. So with a non-flat terrain, you will have speed error with your GPS....

Happy new year Jeff,

How flat is flat though? I did these speeds on a dual carraige way that was fairly straight and flat. I'm not getting getting at you, I do beleive that the speedo can't be that out? So it makes sense that GPS aren't as accurate as we think.

01-13-2008, 01:17 PM	#1 (permalink)
Nelly UK Moderator Join Date: Jul 2007 Location: Reading, Berkshire, UK Bike: 2005 FZ6 Silver & black Posts: 4,355 Rep Power: 53 Member #274	Sat Nav v's Speedo Ok we or most of us would have seen some input on the "how fast is you FZ6" thread. You will also have seen a number of posts that mention speedo error. I was using my sat nav today to take my son to a football match. I thought I would check if my nav had an difference to my speedo. Nav FZ6 18mph 20mph 26mph 29mph (For the life of me, I can't get my bike just to sit at 30mph) 36mph 40mph 56mph 60mph 66mph 71mph 76mph 84mph I had eight satelites tracking me the whole time so it was a reasonable signal. There were a few seconds lag whilst my nav caught up or slowed down. My speedo was also slightly obscured by the nav as I was using the wind screen sucker. So I conclude yes the speedo is way out? or is it. The literature that came with my nav specifically specifies that it is not calibrated to be used as a speed measuring device. So how accurate is a civillian nav? I was always under the impression that there was quite a window of accuracy due to potential military applications. Maybe some of the military guys can answer this. In one of the posts it has been mentioned that you can get a speedo corrector. What are they and how do they work? Cheers Neil __________________ "Some say......... His cardiac output is equal to the FZ6's 4 cylinders at 13,000rpm. All we know is he's called the STIG".:UK: Mods: K&N Airfilter, Datatool system 6 alarm, Bikerdude headlight harness, 12V power socket, Data tag, 15T Front sprocket, Speedo healer, Puig frame slders, front & back Crash bobbin axel sliders. "Dont ask me I got it from here"? Forum FAQs... My Resume...

01-14-2008, 01:06 PM	#6 (permalink)
Nelly UK Moderator Join Date: Jul 2007 Location: Reading, Berkshire, UK Bike: 2005 FZ6 Silver & black Posts: 4,355 Rep Power: 53 Member #274	I think its because the speedo is run off of the engine and not the wheel? I don't fully understand it either. __________________ "Some say......... His cardiac output is equal to the FZ6's 4 cylinders at 13,000rpm. All we know is he's called the STIG".:UK: Mods: K&N Airfilter, Datatool system 6 alarm, Bikerdude headlight harness, 12V power socket, Data tag, 15T Front sprocket, Speedo healer, Puig frame slders, front & back Crash bobbin axel sliders. "Dont ask me I got it from here"? Forum FAQs... My Resume...

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01-14-2008, 12:29 PM	#2 (permalink)
rgatling Junior Member Join Date: Jan 2008 Location: Round Rock, TX Bike: 2007 FZ6 Posts: 23 Rep Power: 4 Member #1198	Here's some info for you... YellR, makers of the YELLOW BOX speedo recalibrator

01-14-2008, 12:37 PM	#3 (permalink)
madmanmaigret Mad like crazy not angry Join Date: Dec 2007 Location: Sarasota, FL Bike: 08 FZ6 Cobalt Blue (fastest color from FZ1) Posts: 1,750 Rep Power: 983 Member #1085	why doesn't yamaha make this correction at the factory? it seems like the speedo (based on neil's observations) is about 5mph off. does anyone know why?

01-14-2008, 12:54 PM	#5 (permalink)
rgatling Junior Member Join Date: Jan 2008 Location: Round Rock, TX Bike: 2007 FZ6 Posts: 23 Rep Power: 4 Member #1198	Why are the speedos off? I don't know, but it is common on all modern bikes. Check any forum for any make/model and you'll read the same thing. I have not used one on previous bikes, but have friends that have. It works as promised. If I change my sprockets, I'll buy one to adjust the speedo and odo.

01-14-2008, 01:32 PM	#7 (permalink)
madmanmaigret Mad like crazy not angry Join Date: Dec 2007 Location: Sarasota, FL Bike: 08 FZ6 Cobalt Blue (fastest color from FZ1) Posts: 1,750 Rep Power: 983 Member #1085	so are most cars but this doesn't seem to affect them....and if that company can fix it im sure yamaha can also.

01-14-2008, 01:55 PM	#8 (permalink)
jeff in ohio Junior Member Join Date: May 2007 Posts: 40 Rep Power: 6 Member #112	Motorcycle Consumer New tested the 2007 and reported a 4mph error at 65mph (going by memory here). The problem with your GPS is that it is calculating your rate of travel based on FLAT travel - not up and down hills. So with a non-flat terrain, you will have speed error with your GPS....

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