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Old June 3rd, 2017, 06:04 PM   #11
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Originally Posted by N4teTheGreat View Post
Just makes me look all the more honest when I tell the cop my speed I guess since they won't think I'm lowballing them :-D
If i'm busted, I'm willing to take the hit for something less than 10mph over the limit. Once you click over 10 your in a world of hurt.
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Old June 3rd, 2017, 06:57 PM   #12
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Can a Ducati tech remove the correction factor?
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Old June 3rd, 2017, 09:14 PM   #13
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^^^ I don't believe so.
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Old June 4th, 2017, 09:52 AM   #14
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Originally Posted by Hyp Noob View Post
My unscientific observations indicate a 5% to 7% off-set based on random GPS comparisons and using stationary Radar speed signs. This is typical of all bikes I've ridden and tested.

Does the owners manual state the exact percentage of speedo off-set built into the ECU?

As stated correctly, ALL manufacturers off-set speedo readings optimistically, usually between 5% up to 10%. But ODO readings will be accurate (providing tires are stock size)

So far, I've hit 130 mph indicated on my HyperStrada. So I guess about 124 mph actual? Not bad! Wind blast about ripped me off the bike. (this done prone, head down under screen) I think in calm weather could have gone a bit more. Did not note RPM.

Anyone done top speed testing? Results?
From the 821 manual.

Speedometer is off big time after changing front sprocket to 14T
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Old June 5th, 2017, 09:58 AM   #15
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I've heard this is due to EU paranoia over the chance someone would put a much bigger tire on the back. Mustn't give some clueless owner the excuse for speeding.

However, I would support going up one on the countershaft if it corrected this... our Mazdas are spot on as is our SV650 with the SpeedoDRD. I generally gear our bikes up a bit. Need to check if one will fit.
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Old June 5th, 2017, 10:51 AM   #16
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Of all my bikes the Hyper is the least optimistic. It is usually very close to the speed signs on the highway.

Still bummed I can't fit a 14T front sprocket. It shouldn't affect anything, but somehow it does.
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Old June 5th, 2017, 01:03 PM   #17
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Originally Posted by kuksul08 View Post
Of all my bikes the Hyper is the least optimistic. It is usually very close to the speed signs on the highway.

Still bummed I can't fit a 14T front sprocket. It shouldn't affect anything, but somehow it does.
You could always go to a 520 chain kit and get a 46 tooth rear. I'm unaware if anyone makes a 46 for the stock 525 chain.
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Old June 6th, 2017, 01:11 PM   #18
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It sounds very much like the speedo gets its signal from the countershaft. So changing the final drive ratio in any way will cause a similar error. If it were tied to the ABS the final ratio would not matter.

So going down two teeth on the rear would provide a bit less than a -5% correction. For me, this plus more relaxed revs on the highway would offset any loss of roll-on performance. I can always downshift...

Last edited by zippy49; June 6th, 2017 at 01:15 PM. Reason: clarity
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Old June 7th, 2017, 05:07 AM   #19
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Originally Posted by zippy49 View Post
It sounds very much like the speedo gets its signal from the countershaft. So changing the final drive ratio in any way will cause a similar error. If it were tied to the ABS the final ratio would not matter.

So going down two teeth on the rear would provide a bit less than a -5% correction. For me, this plus more relaxed revs on the highway would offset any loss of roll-on performance. I can always downshift...
I can pretty confidently say that all bikes with Bosch ABS get their speed from the ABS sensors. We could have new ABS rings with 8% fewer pulses made over 1 revolution, and it would correct the speedo, and ABS would still work perfectly.
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Old June 7th, 2017, 07:42 AM   #20
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I can pretty confidently say that all bikes with Bosch ABS get their speed from the ABS sensors. We could have new ABS rings with 8% fewer pulses made over 1 revolution, and it would correct the speedo, and ABS would still work perfectly.
But then your odometer reading would be off.
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