Speedometer accuracy - Wrist Twisters
 
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post #1 of 18 Old 10-29-2011, 10:40 PM Thread Starter
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Speedometer accuracy

Does anyone know how accurate the speedometers are on the 919s. It seems that it goes effortlessly at 80 or above and people are passing me quite often. Which makes me wonder if the speedo is correct. Thanks mike

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post #2 of 18 Old 10-29-2011, 11:08 PM
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It's not.

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post #3 of 18 Old 10-29-2011, 11:53 PM
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with stock gearing 16/43 (pretty sure at those numbers) your lookin at about right at a speedo reading of 8-9% high (that is 55mph is actually right close to 50 in real life)... yet odometer reading is less than 1.5% off.

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post #4 of 18 Old 10-30-2011, 04:28 AM
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As ND4S said above, 8%. Those that have compared GPS reading to the speedo have confirmed this. I experience the same thing as you often. Lately, though, I've had cars going exactly the speed limit as shown on my speedo. Maybe theirs are off too? I need to do the GPS test for my peace of mind because I factor the error into my "acceptable risk" speed.

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post #5 of 18 Old 10-30-2011, 08:15 AM
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I've always stop watched every vehicle I've bought against mile markers. Of course now we have inexpensive GPS units. At 60 my 919 is just about on the money.

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post #6 of 18 Old 10-30-2011, 09:35 AM
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Mine was about about 9 % between the speedo error and the change from stock to 16/45 gearing. I put a speedo healer on it and it's now spot on at 100 kph as confirmed by a chassis dyno.

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post #7 of 18 Old 10-30-2011, 09:49 AM
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Every bike I've had has been about 10% off. The change to 17/44 gearing brought me closer to accuracy, but exactly how close I don't know.

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post #8 of 18 Old 10-30-2011, 10:53 AM
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the problem with getting the speedo reading proper speeds is now your odometer is going to be vastly off.

To be honest i like having my 919's speedo read high, its guaranteed to of saved me from a speeding ticket or two.

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post #9 of 18 Old 10-30-2011, 05:16 PM Thread Starter
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Thanks
I will have to try the gps.

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post #10 of 18 Old 10-30-2011, 09:27 PM
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I don't know what the heck you guys are talking about. My speedo is DEAD on, even verified with GPS.


OOOH.........nm............
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post #11 of 18 Old 10-30-2011, 09:42 PM
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Quote:
Originally Posted by g00gl3it View Post
I don't know what the heck you guys are talking about. My speedo is DEAD on, even verified with GPS.


OOOH.........nm............
well.... u got one dem der fancy koso things.

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post #12 of 18 Old 10-30-2011, 10:01 PM
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With a 17 tooth counter sprocket, I read 46 mph when a local radar clocks me at 45 mph. I don't know how accurate that radar is...but, it seems about right to me.

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post #13 of 18 Old 10-30-2011, 10:39 PM
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Quote:
Originally Posted by Blackheart View Post
With a 17 tooth counter sprocket, I read 46 mph when a local radar clocks me at 45 mph. I don't know how accurate that radar is...but, it seems about right to me.
that would definitely get it close as you would be down 6.25% in rpms to go the same speed.

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post #14 of 18 Old 11-01-2011, 12:20 AM
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I believe most modern bikes n cars are around 7-10% out, mainly to help you not get done in radar trap, hence the leeway most police farces give...

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post #15 of 18 Old 11-02-2011, 08:59 AM
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Quote:
Originally Posted by g00gl3it View Post
I don't know what the heck you guys are talking about. My speedo is DEAD on, even verified with GPS.


OOOH.........nm............
Do you have a shot of how you have that mount attached? Looks pretty cool.

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post #16 of 18 Old 11-02-2011, 09:40 AM
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The wifes 919 when the gps is showing 70 her speedo is 78. My ZRX's are about the same with my cruiser 1100 speedo showing between 125 and 130 the gps was at 116. My ZX14 is also reading fast because at 85 I am not passing people very fast.

My beemer with the cruise set at 90 shows 89 on the gps and my jeep at 80 is 79 on the gps.

919 and the 14 will get speed healers before riding time next year.

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post #17 of 18 Old 11-02-2011, 09:44 AM
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Quote:
Originally Posted by fritzwilliam View Post
Do you have a shot of how you have that mount attached? Looks pretty cool.
Which mount, the GPS or the gauges?

The gauge mounts were built by the PO, Arctic954. Just some gauge metal bolted to the stock triple.


The GPS was just a cheapie $4 Amazon hanldebar mount for Garmin GPS units.

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post #18 of 18 Old 11-02-2011, 03:17 PM
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Quote:
Originally Posted by Bobby View Post
919 and the 14 will get speed healers before riding time next year.
Save yourself some coin and just wait for the 919 to need new chain and sprocket, then go with the 17/44 gearing. Wheelies are harder to come by, but still doable, the cruising RPM at highway speed is less buzzy, and the speedo is corrected. Much better than the stock 16/43.

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