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TOPIC: Re:GPS Speed vs Speedometer?
#131755
Darn Oldie (User)
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GPS Speed vs Speedometer? 2 Months, 2 Weeks ago  
When I first bought my 07 Silverado I thought I was moving a little slow for the posted speed, and plenty of other vehicles were passing me on the Hi-way. Normally around Green Bay our drivers are very speed conscious and don't normally do more than 5mph over the posted Hi-way speeds. I found myself doing 75-80 in a 65 to just keep up.

Recently I added a Tom Tom GPS to my ride and found that according to the GPS (which is fairly accurate in my car) that showed my speedo to be off by 5mph at 65. 65 on the GPS was 70 on the bikes speedo.

Is this fixable, or just something I have to live with.
By the way, the bike is stock, no tire mods or engine mods of any kind.

HELP
 
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#131761
Frank_W (User)
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Re:GPS Speed vs Speedometer? 2 Months, 2 Weeks ago  
In my Jeep, I have a Garmin and use the speedometer on it, because with the larger tires, the Jeep's speedometer is goofed.
 
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#131764
Gram (Admin)
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Re:GPS Speed vs Speedometer? 2 Months, 2 Weeks ago  
Darn Oldie wrote:
When I first bought my 07 Silverado I thought I was moving a little slow for the posted speed, and plenty of other vehicles were passing me on the Hi-way. Normally around Green Bay our drivers are very speed conscious and don't normally do more than 5mph over the posted Hi-way speeds. I found myself doing 75-80 in a 65 to just keep up.

Recently I added a Tom Tom GPS to my ride and found that according to the GPS (which is fairly accurate in my car) that showed my speedo to be off by 5mph at 65. 65 on the GPS was 70 on the bikes speedo.

Is this fixable, or just something I have to live with.
By the way, the bike is stock, no tire mods or engine mods of any kind.

HELP


This is normal. They are all like that. I can't remember why
 
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#131765
Darn Oldie (User)
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Re:GPS Speed vs Speedometer? 2 Months, 2 Weeks ago  
I know, the GPS is typically very close to correct, what I need to know, is there a fix for it? If you think about it, every 6500 actual miles my bike will have registered 7000 miles, that doesn't help calculate mileage, for fuel, tires, warranty, resale.... etc...

What's a guy to do???
 
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#131768
Gram (Admin)
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Re:GPS Speed vs Speedometer? 2 Months, 2 Weeks ago  
This is the only way I am aware of that it can be resolved:

Speedo Healer
 
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#131769
Darn Oldie (User)
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Re:GPS Speed vs Speedometer? 2 Months, 2 Weeks ago  
Just looked up the speedo-healer, sounds like it will do the trick, and only about $110.

Thanks!!! I'll let you know if it works, hopefully it won't take to long to get and will be easy enough to install that even I can do it.

Darn
 
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#131771
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Re:GPS Speed vs Speedometer? 2 Months, 2 Weeks ago  
I believe if you correct the speedo your odo will then be off. It's one of those deals where you need to decide which is more important to you. Since I know my speedo is off I can correct that with simple math, I'd prefer my odo to be on.
 
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#131775
Darn Oldie (User)
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Re:GPS Speed vs Speedometer? 2 Months, 2 Weeks ago  
??

So you are saying that if I ride 60 miles (measured by map or GPS), my ODO will read that I traveled 65 miles, even thou the speedo says I am traveling 70 miles per hour for an hour?

Now I feel a math lesson coming on.... I'm on a train heading north at 70, how long before I reach 65??

My calculus is really bad... Help!!
 
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#131776
BigBoyinMS (User)
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Re:GPS Speed vs Speedometer? 2 Months, 2 Weeks ago  
Yamaha speedos are approximately 7-8% off but the odometer is supposedly correct. Yamaha's way of keeping us legal.

I read this somewhere but I don't if it's correct.

EDIT: I never thought to test the odo with the GPS. I'll let y'all know next time I'm out on the Venture.
 
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Last Edit: 2008/10/20 15:50 By BigBoyinMS.
 
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#131777
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Re:GPS Speed vs Speedometer? 2 Months, 2 Weeks ago  
You might want to just take it out on the hiway and measure a few miles traveled along the milemarkers to what your odo says. Considering how far the speedo is off, I would would check the odo as I hit a marker, then drive for five or ten mile markers and check again.
 
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