Accuracy - MVAgusta.net
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post #1 of 20 (permalink) Old 07-01-2012, 01:33 PM Thread Starter
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Accuracy

Just checked out the bike speedo read out in comparison with MCN Ride GPS logger, without disclosing the speed, bike reading was indicating 17mph, yes 17mph above the data recorded on the GPS logger
I just cannot believe the variation, has anybody checked their bike out, or have any comments as to why there should be such a difference

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post #2 of 20 (permalink) Old 07-01-2012, 03:54 PM
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Quote:
Originally Posted by Bruce Taylor View Post
Just checked out the bike speedo read out in comparison with MCN Ride GPS logger, without disclosing the speed, bike reading was indicating 17mph, yes 17mph above the data recorded on the GPS logger
I just cannot believe the variation, has anybody checked their bike out, or have any comments as to why there should be such a difference
This is common on ALOT of sportbikes. I have seen the Japanese sportbikes read 20+ mph over what the actual speed they were moving. The faster your actual speed the higher the error. Most 600's will read as high as 180+ mph top speed and we all know thats not going to happen. They even make devices that will fix the speedo inaccuracy like this one here.

http://www.calsportbike.com/sh/

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post #3 of 20 (permalink) Old 07-01-2012, 05:07 PM
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Quote:
Originally Posted by Bruce Taylor View Post
Just checked out the bike speedo read out in comparison with MCN Ride GPS logger, without disclosing the speed, bike reading was indicating 17mph, yes 17mph above the data recorded on the GPS logger
I just cannot believe the variation, has anybody checked their bike out, or have any comments as to why there should be such a difference
Pretty common, my mk5 Golf speedo reads 80 mph when the tomtom says 72 mph

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post #4 of 20 (permalink) Old 07-01-2012, 05:56 PM
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There is no limit to how high they are allowed to read, they just are not allowed to read lower than actual speed. Most car manufacturers will spec a 5-10% over read in speedo's. Japanese manufacturers tend to be a little higher. You don't calculate it by how many mph or kmh out it is, it's in percentage. So i.e a speedo that is 5% out would read 105 at 100 actual 210 at 200 actual, etc, etc

"You live more for five minutes going fast on a bike than other people do in all their life" #58

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post #5 of 20 (permalink) Old 07-01-2012, 05:57 PM
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So you not disclosing the speed actually makes your statement worth nothing really at all because we don't know the percentage it was out by

"You live more for five minutes going fast on a bike than other people do in all their life" #58

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post #6 of 20 (permalink) Old 07-01-2012, 09:34 PM
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the speedo is running 10% to high. had 400km on GPS on my last trip and the speedo showed 437km
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post #7 of 20 (permalink) Old 07-01-2012, 11:19 PM
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the speedo is running 10% to high. had 400km on GPS on my last trip and the speedo showed 437km
That is quite normal for most vehicles

"You live more for five minutes going fast on a bike than other people do in all their life" #58

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post #8 of 20 (permalink) Old 07-02-2012, 08:51 AM Thread Starter
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So you not disclosing the speed actually makes your statement worth nothing really at all because we don't know the percentage it was out by
18% to be precise
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post #9 of 20 (permalink) Old 07-02-2012, 09:28 AM
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ALL Japanese motorcycles read fast (7~10% is the standard) and have for as long as I have been involved in bikes. My 910R reads much more accurately than my friend's Yamaha cruiser.

Also remember that different tires can change accuracy as can tire wear and pressure....and forget everything if you change gearing.

Gearing changes are the real reason the "Speedo Healers" were brought to market.

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post #10 of 20 (permalink) Old 07-02-2012, 11:10 AM
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Quote:
Originally Posted by esq'z me View Post
Also remember that different tires can change accuracy as can tire wear and pressure....and forget everything if you change gearing.

Gearing changes are the real reason the "Speedo Healers" were brought to market.
gearing doesn't effect Aprilias.....speedo reads off the sprocket bolts, something Aprilia got right

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