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Buell Forum » Big, Bad & Dirty (Buell XB12X Ulysses Adventure Board) » BB&D Archives » Archive through May 30, 2007 » How accurate is the Uly Speedo? « Previous Next »

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Dirt
Posted on Thursday, May 17, 2007 - 04:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Can any of you guys with GPS units tell me how it compares with the Uly speedometer. I don't have a GPS to compare with, but my bike feels like it's moving 5 mph slower than what the speed indicates. I'm just curious.

Thanks
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Roadrailer
Posted on Thursday, May 17, 2007 - 04:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

No GPS yet, but the town I live in has one of those "your speed is..." signs they park on the side of the road. At 40 mph indicated on the speedo the sign reads 37-38 mph. Good enough for me. YMMV.
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Evileye
Posted on Thursday, May 17, 2007 - 04:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Mine is about 5mph off at 60 mph,slow that is.
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Ft_bstrd
Posted on Thursday, May 17, 2007 - 04:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I think error creeps in as speed increases. Take a look at the "Top Speed on a Uly" thread. It's as much as 12 MPH off at top speeds.

Must have been designed by the Yamaha tach people. ;)
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Dirt
Posted on Thursday, May 17, 2007 - 04:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I thought so. I usually cruise at about 75 mph, but it sure feels like 70 mph.
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Lowflyer
Posted on Thursday, May 17, 2007 - 05:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My experience has shown the speedo error is somewhere around 5 percent.
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Lowflyer
Posted on Thursday, May 17, 2007 - 05:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

That is, 5% on my bike using my own high-sensitivity differential GPS.
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Lorazepam
Posted on Thursday, May 17, 2007 - 06:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

mine is between 3-6 mph different depending on speed, using a garmin 2610
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Ft_bstrd
Posted on Thursday, May 17, 2007 - 07:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I think error creeps in as speed increases. Take a look at the "Top Speed on a Uly" thread. It's as much as 12 MPH off at top speeds.

Must have been designed by the Yamaha tach people. ;)
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Hooliken
Posted on Thursday, May 17, 2007 - 07:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My Magellan says 63 when my Uly says 60.

Good one Ft_bstrd.
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Froggy
Posted on Thursday, May 17, 2007 - 08:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I was wondering this too, on my Buell Quest GPS, it will say a few MPH less than what my bike says. Typically the gauge will say about 60 and my GPS will say 56 or 57. It seems to get a bit worse as you get higher, like GPS saying 75 while the gauge said 80. I took the GPS in my car and went for a 3 hour drive, and it was always within 1mph whenever i looked.
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Ridetherejk
Posted on Thursday, May 17, 2007 - 08:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Most bikes are off 5%-10% in speed. This may sound stupid but 2 reasons this is done is
1. Now you can speed without really doing so.
2. This raises your odometer higher than it should be. After awhile you'll see how this increases the profits of the dealers servicing your bikes. ( I know, a lot service their own, but a lot do not.)
A number of car companies do the same. Even the warranty expires sooner. A win win for the manufacturers.

(Message edited by ridetherejk on May 17, 2007)
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Jackbequick
Posted on Thursday, May 17, 2007 - 08:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

As of 1997, federal standards in the United States allow a maximum 5% error on speedometer readings on new cars sold here.

Also, the displayed speed is a calculated from the engine speed and tire size. A change in tires, even from one brand to another of the same size, can change things a little. Changing to a taller tire makes your speedo read low.

Jack
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Kurbennett
Posted on Thursday, May 17, 2007 - 08:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Varies somewhat, but usually the GPS is 5 miles an hour faster than the speedo.
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Jk3campbell
Posted on Thursday, May 17, 2007 - 08:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Mine is right around 5% compared to the GPS. Which is much better than the 10% from the SV. It also will get worse as the tires wear and become smaller.
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Thunderbox
Posted on Friday, May 18, 2007 - 04:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I know that in our jurisdiction the only certified way to test a speedometer acurately for court is to use a Radar. Hey I can do that. I do it all the time on our police cruisers. I think I will and I will. We test at 50-80 and 100 kph. I will get back at you all.
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Brown_e
Posted on Saturday, May 19, 2007 - 09:20 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My GPS reads 58 mph at 60 mph on the speedometer. 2 mph less than actual which is 3% error.
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Retired_cop
Posted on Saturday, May 19, 2007 - 09:45 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My speedo is 5-7% higher than the GPS readings at all speeds.
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Sanchez
Posted on Monday, May 21, 2007 - 08:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My GPS says 77 when my speedo says 80.
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Etennuly
Posted on Tuesday, May 22, 2007 - 09:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

It seems as though there is a consensus on the average Speedo error being about 2% to 5% based on GPS comparisons. Has anyone looked into the accuracy of our tachometers? Using the formula for speed/RPM/gear ratio/tire diameter, should give the most accurate speed at a given RPM, if the tach is accurate and tire wear is taken into account.

Ahh how things have changed. We used to look up formulas and figure things out, and maps to see where we are, now we look at the face of a $500 GPS unit and take the thinking away. Life is becoming a video game more and more, every day.

Ride'm while you got'em folks. The next generation will ask why did you go to all of that expense and effort to go out in the elements for a ride on a dangerous machine like that?
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Aeholton
Posted on Wednesday, May 23, 2007 - 07:50 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

35mph speedo = 32 mph gps
65mph speedo = 59 mph gps

YMMV
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Lousirider
Posted on Friday, September 19, 2008 - 08:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

So, heres a stupid question.. Is there any "fix" for the speedo error? I hate to resurrect this thread just to ask...but I have to know. My 06 12X is apparently showing "slower than go" speed.
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Lowflyer
Posted on Friday, September 19, 2008 - 09:04 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I fixed mine with a Zumo.

I rarely pay much attention to the speedo. I mostly watch the tach. If I want to know exact speed, I look at the gps.
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Sanchez
Posted on Friday, September 19, 2008 - 09:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yep, you need a Speedohealer. http://www.pashnit.com/product/speedohealer.html
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Court
Posted on Friday, September 19, 2008 - 09:27 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I fixed mine with a Zumo.
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Froggy
Posted on Friday, September 19, 2008 - 09:37 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I intensionally broke the speedo on my bike, makes it a bit easier to stretch the truth to the cops : )

Anyway, i got a Veypor VR2 and Garmin Zumo that i use for getting the speed.



Remember, its 60mph at 3000rpm in 5th, and 10mph in 500 rpm increments. 70 is 3500, 80 is 4000, 90 is 45, etc. : )
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