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post #1 of 36 (permalink) Old 09-18-2011, 09:24 AM Thread Starter
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Default Speedo Error

Got my GPS wired up and did a road trip this weekend. Noticed the Speedo has a 6 mph optimistic error everywhere from 65 mph (indicated as 71 mph) to 85 mph (indicated as 91 mph).

Don't know if that's common to all our bikes, but I would assume so.




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post #2 of 36 (permalink) Old 09-18-2011, 11:25 AM
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The only bike I've ever had that was close to accurate is my Harley Police Electra Glide with the certified speedo. My Japanese sportbikes have usually been the worst of the bunch.

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post #3 of 36 (permalink) Old 09-18-2011, 11:58 AM
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Saddlebag, It's common practice for manufacturers to make their speedos optimistic by about 5%. If I recall correctly, I read that the Feds limit that optimism to 15%. That 6mph you mention will really be a percentage. The 2 examples you provide give differing percentages. The first is a gain of 9% and the second is 7%. It's gotta be one or the other, or maybe there's some sorta glitch going on in that dial.

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post #4 of 36 (permalink) Old 09-18-2011, 12:29 PM Thread Starter
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Quote:
Originally Posted by RICZ View Post
Saddlebag, It's common practice for manufacturers to make their speedos optimistic by about 5%. If I recall correctly, I read that the Feds limit that optimism to 15%. That 6mph you mention will really be a percentage. The 2 examples you provide give differing percentages. The first is a gain of 9% and the second is 7%. It's gotta be one or the other, or maybe there's some sorta glitch going on in that dial.
Which is what I thought was odd too. At an indicated 55 mph the error was maybe 2 or 3 mph IIRC, but from 65 to 85 mph it was a pretty consistent 6 mph. In fact, there was a couple of times I set the speedo to 90 and saw 85 mph on the GPS, indicating that the speedometer was re-gaining accuracy at the higher speed.

Makes you wonder how that affects the odometer readings. If they correspond, and I don't see why they wouldn't, the guy riding highway miles is logging miles considerably faster than the city rider despite the actual distance traveled.

Anyway, it was just general info for people not to get too panicked if they see a cop when their speedo reads over 70 mph in a 65 zone. Hell, even a speedo reading of 80 mph is probably within the hard eye range.




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post #5 of 36 (permalink) Old 09-19-2011, 07:36 AM
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My previous bike (Kawasaki) was off exactly 10%. I installed a device called a Speedo-Healer to recalibrate it because the error bothered me so much.

Surprisingly, my XC speedo matches exactly with my GPS speed reading.
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post #6 of 36 (permalink) Old 09-19-2011, 11:38 AM
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Mine is also off calibration and I have read that it may have something to do with the stage 1 download. If I have a PCV, can I reset my mph calibration or is this a dealer adjustment only? I purchased my bike with a stage 1 download so I haven't had a before and after comparison.

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post #7 of 36 (permalink) Old 09-22-2011, 11:11 AM
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Quote:
Originally Posted by saddlebag View Post
Got my GPS wired up and did a road trip this weekend. Noticed the Speedo has a 6 mph optimistic error everywhere from 65 mph (indicated as 71 mph) to 85 mph (indicated as 91 mph).

Don't know if that's common to all our bikes, but I would assume so.
I use a GPS all the time. My 2011 XC is more accurate, at 70 (per GPS) it indicates 72 or so.

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post #8 of 36 (permalink) Old 09-22-2011, 06:59 PM Thread Starter
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Quote:
Originally Posted by VIC11CC View Post
Mine is also off calibration and I have read that it may have something to do with the stage 1 download. If I have a PCV, can I reset my mph calibration or is this a dealer adjustment only? I purchased my bike with a stage 1 download so I haven't had a before and after comparison.
Interesting, I hadn't heard this before, but mine also has the Stage 1 mods.




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post #9 of 36 (permalink) Old 09-22-2011, 07:00 PM Thread Starter
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I use a GPS all the time. My 2011 XC is more accurate, at 70 (per GPS) it indicates 72 or so.
Do you have the Stage 1 mods? Do any of the rest of you with accurate speedos have the Stage 1 mods?




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post #10 of 36 (permalink) Old 09-22-2011, 07:17 PM
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Quote:
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Do you have the Stage 1 mods? Do any of the rest of you with accurate speedos have the Stage 1 mods?
I have a PC-V, but NO stage 1 download. Perhaps the stage 1 download is the cause?

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