jailcop
Novice Class
Posts: 100
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posted June 01, 2008 04:18 PM
Speedo Error Confirmed
I just checked my speedometer against 2 GPS units (my Garmin Nuvi 350 and my friends Zumo) and the results were identical. At 100 MPH indicated on the speedo both GPS units registered 95.8. Also at lower speeds the indication was about the same, the speedo reads about 4 MPH higher than your actually moving. What struck me as odd is even at an indicated 45 MPH it's off almost exactly the same as it is a 100.
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That, That Does Not Kill Me Can Only Make Me Stronger
  
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oncourse
Expert Class
I hate flies!!!
Posts: 467
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posted June 01, 2008 04:29 PM
It is still reeeeaaaalllll close for a bike!! 4.2mph at 100 ain't bad at all. Hey it does 4 mph just sitting there not even running 
Rob
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True intellegence is not measured by your degrees.
04 klr 250 Lots of mods and 70 MPG!!
08 Connie 2 bros. Carbon. Helibars. Flies out, PC3!!!
2003 kx 500 SOLD
2004 KX 500 In service now, whata BEAST!
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DrewHerc130
Expert Class
Posts: 140
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posted June 02, 2008 09:44 AM
 Edited By: DrewHerc130 on 2 Jun 2008 10:53
I noticed that mine indicates right at 4 mph high. I noticed this when approaching one of those radar speed signs that flash your speed as you approach a lower speed zone. I was going 45 and the sign said like 40 or 41. I've gone that way a few times and same thing every time.
Jailcop, what tolerance are GPS speedometers accurate to? Surely they too have their limitations.
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2008 C14, flies out, Area P-Carbon, BMC, PC3, Spencer Seat Mod, Alaska Leather, Helibars with Ram GPS mount, Nuvi 250W
"Life moves pretty quick. If you don't stop and look around once in a while, you could miss it."
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jailcop
Novice Class
Posts: 100
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posted June 02, 2008 10:35 AM
quote:
I noticed that mine indicates right at 4 mph high. I noticed this when approaching one of those radar speed signs that flash your speed as you approach a lower speed zone. I was going 45 and the sign said like 40 or 41. I've gone that way a few times and same thing every time.
Jailcop, what tolerance are GPS speedometers accurate to? Surely they too have their limitations.
I don't know what their limits are but I found it interesting that both indicated the exact same speed in my little test. I'm going to try to get in touch with one of my Police friends (I have a few) and see if I can test it against one of there radar guns..
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That, That Does Not Kill Me Can Only Make Me Stronger
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drewherc130
Expert Class
Posts: 140
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posted June 02, 2008 12:55 PM
That's a good idea, since what the cops see is really all that matters.
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2008 C14, flies out, Area P-Carbon, BMC, PC3, Spencer Seat Mod, Alaska Leather, Helibars with Ram GPS mount, Nuvi 250W
"Life moves pretty quick. If you don't stop and look around once in a while, you could miss it."
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oncourse
Expert Class
I hate flies!!!
Posts: 467
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posted June 02, 2008 02:11 PM
My garmin says 1/10 of 1 mph.
Rob
____________
True intellegence is not measured by your degrees.
04 klr 250 Lots of mods and 70 MPG!!
08 Connie 2 bros. Carbon. Helibars. Flies out, PC3!!!
2003 kx 500 SOLD
2004 KX 500 In service now, whata BEAST!
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jailcop
Novice Class
Posts: 100
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posted June 02, 2008 03:38 PM
Well I finally opened my C14 up
Well I finally opened my C14 up all the way, Damm It's faster than I thought...LOL
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That, That Does Not Kill Me Can Only Make Me Stronger
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oncourse
Expert Class
I hate flies!!!
Posts: 467
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posted June 02, 2008 05:02 PM
I can't even imagine that one, I guess I would leave the flies in if I were you as it really does fly! What, 3 turbos with nitrous and higher gearing?? The zx-14 and 'busa guys must be banngin' their heads...  
Rob
____________
True intellegence is not measured by your degrees.
04 klr 250 Lots of mods and 70 MPG!!
08 Connie 2 bros. Carbon. Helibars. Flies out, PC3!!!
2003 kx 500 SOLD
2004 KX 500 In service now, whata BEAST!
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Drewherc130
Expert Class
Posts: 140
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posted June 02, 2008 08:29 PM
Rob which garmin gps do you have? One tenth of a mph is pretty good!
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2008 C14, flies out, Area P-Carbon, BMC, PC3, Spencer Seat Mod, Alaska Leather, Helibars with Ram GPS mount, Nuvi 250W
"Life moves pretty quick. If you don't stop and look around once in a while, you could miss it."
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oncourse
Expert Class
I hate flies!!!
Posts: 467
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posted June 03, 2008 01:55 AM
It's a handheld 60csx, it even works in my basement and there is nothing but concrete down there, very sensitive!
Rob
____________
True intellegence is not measured by your degrees.
04 klr 250 Lots of mods and 70 MPG!!
08 Connie 2 bros. Carbon. Helibars. Flies out, PC3!!!
2003 kx 500 SOLD
2004 KX 500 In service now, whata BEAST!
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garvin6
Novice Class
us citizen
Posts: 35
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posted June 03, 2008 03:48 PM
I noticed the speedo error right from the get go. I would drive the same road in a car and note the speed and then drive on the bike and get much higher readings while doing the same speed. I have just adjusted accordingly. 80 in a 65 and 90 in a 70, just slowly moving a little faster than the rest of the traffic.
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Kevin F. Garvin
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