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TOPIC: Re:GPS Speed vs Speedometer? Forum Tools Post New Topic Show latest posts Rules

#131755 Darn (User) Don't forget, Never forget. Platinum Boarder Posts: 7103 GPS Speed vs Speedometer? 3 Years, 7 Months 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   Logged     Free, personalized tra   The administrator has disabled public write access. #131761 Frank_W (User) Riding The Filthy Sow! Platinum Boarder Posts: 3510 Re:GPS Speed vs Speedometer? 3 Years, 7 Months 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.   Logged     My Music Whatever...   The administrator has disabled public write access. #131764 Gram (Admin) Been there, wrecked that. Admin Posts: 4328 Re:GPS Speed vs Speedometer? 3 Years, 7 Months 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   Logged       The administrator has disabled public write access. #131765 Darn (User) Don't forget, Never forget. Platinum Boarder Posts: 7103 Re:GPS Speed vs Speedometer? 3 Years, 7 Months 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???   Logged     Free, personalized tra   The administrator has disabled public write access. #131768 Gram (Admin) Been there, wrecked that. Admin Posts: 4328 Re:GPS Speed vs Speedometer? 3 Years, 7 Months ago   This is the only way I am aware of that it can be resolved: Speedo Healer   Logged       The administrator has disabled public write access. #131769 Darn (User) Don't forget, Never forget. Platinum Boarder Posts: 7103 Re:GPS Speed vs Speedometer? 3 Years, 7 Months 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   Logged     Free, personalized tra   The administrator has disabled public write access. #131771 RoadieFF (Moderator) Moderator Posts: 2594 Re:GPS Speed vs Speedometer? 3 Years, 7 Months 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.   Logged       The administrator has disabled public write access. #131775 Darn (User) Don't forget, Never forget. Platinum Boarder Posts: 7103 Re:GPS Speed vs Speedometer? 3 Years, 7 Months 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!!   Logged     Free, personalized tra   The administrator has disabled public write access. #131776 BigBoyinMS (User) I'm satisfied never being satisfied. Platinum Boarder Posts: 1705 Re:GPS Speed vs Speedometer? 3 Years, 7 Months 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.   Logged     Last Edit: 2008/10/20 15:50 By BigBoyinMS.   2006 Midnight   The administrator has disabled public write access. #131777 Gram (Admin) Been there, wrecked that. Admin Posts: 4328 Re:GPS Speed vs Speedometer? 3 Years, 7 Months 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.   Logged       The administrator has disabled public write access.

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