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Author Topic: Africa 1000 Topspeed and speedo accuracy  (Read 1137 times)

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Offline Battlestar

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Africa 1000 Topspeed and speedo accuracy
« on: April 13, 2018, 10:41:57 am »
So here I am cruising along at an indicated 160kph thinking yoh this motor just purrs at high speeds. I then give it the berries and take her to terminal velocity at an indicated 221kph. Now im smiling as based on what im seeing this machine is quick and moves rapidly.....

Fast forward 3 weeks and I have now fitted my GPS and oh my word the speedo over reads chronically! At an indicated 120kph im only doing 108 @ an indicated 160kph true speed 144 and the biggest leveler is at an indicated 220kph true speed is 200kph.  Effectively a 10% over read. Not sure if it annoys me or not. At least it will keep the speeding fines down  :deal:
« Last Edit: April 13, 2018, 12:36:35 pm by Battlestar »
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Offline m0lt3n

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Re: Africa 1000 Topspeed and speedo accuracy
« Reply #1 on: April 13, 2018, 10:47:20 am »
haha welcome to our world!

Agreed on speeding fines being kept down, but its still a huge frustration
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Offline iamgigglz

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Re: Africa 1000 Topspeed and speedo accuracy
« Reply #2 on: April 13, 2018, 10:50:09 am »
10% is on the high end of normal.
My Transalp was 6% over. My 990 is about 8%
At least 10% is easy to calculate on the fly. You get used to it.
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Offline Battlestar

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Re: Africa 1000 Topspeed and speedo accuracy
« Reply #3 on: April 13, 2018, 10:58:42 am »
10% is on the high end of normal.
My Transalp was 6% over. My 990 is about 8%
At least 10% is easy to calculate on the fly. You get used to it.
True

Makes for good pub talk tho. On the top end it almost appears as if the bike is soft limited to 200kph.
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Offline armpump

Re: Africa 1000 Topspeed and speedo accuracy
« Reply #4 on: April 13, 2018, 10:59:25 am »
haha welcome to our world!



NOT anymore  :)

 

Offline Ian in Great Brak River

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Re: Africa 1000 Topspeed and speedo accuracy
« Reply #5 on: April 13, 2018, 02:55:08 pm »
6% on my AT according to GPS, on my S10 it was 8%.
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Offline Battlestar

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Re: Africa 1000 Topspeed and speedo accuracy
« Reply #6 on: April 13, 2018, 03:06:39 pm »
6% on my AT according to GPS, on my S10 it was 8%.

Alot better than mine. Im running standard Dunlop tyres. Not sure where the pick up is
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Offline Ian in Great Brak River

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Re: Africa 1000 Topspeed and speedo accuracy
« Reply #7 on: April 13, 2018, 09:23:17 pm »
6% on my AT according to GPS, on my S10 it was 8%.

Alot better than mine. Im running standard Dunlop tyres. Not sure where the pick up is

It's in the gearbox I believe, test it on center stand and in 2nd gear.
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Offline DavidMorrisXp

Re: Africa 1000 Topspeed and speedo accuracy
« Reply #8 on: April 14, 2018, 06:17:32 am »
With a 15t on my CS on the AT, the over read is closer to 17%
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Offline 171steve

Re: Africa 1000 Topspeed and speedo accuracy
« Reply #9 on: April 14, 2018, 08:23:32 pm »
I do think the pickup is on the back wheel.
I remember the one i had for the weekend to test overread alsoaboutb10kmph on the std dunlops
With tractioncontrol off you can even se the speedo jump as it starts spinning the rear wheel it was just over 20kmph slower and not only from spinning on the gravel i had the same overreading on tarmac.
« Last Edit: September 03, 2018, 07:18:07 am by 171steve »
 

Offline BikerJan

Re: Africa 1000 Topspeed and speedo accuracy
« Reply #10 on: May 28, 2018, 01:36:46 pm »
The speedo on my bike is also overreading with 10+%, which is frustrating!

Is there a way to fix this? It is uncomfortable to check the speed on the GPS the whole time
 

Offline Grunder

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Re: Africa 1000 Topspeed and speedo accuracy
« Reply #11 on: May 28, 2018, 02:00:20 pm »
So here I am cruising along at an indicated 160kph thinking yoh this motor just purrs at high speeds. I then give it the berries and take her to terminal velocity at an indicated 221kph. Now im smiling as based on what im seeing this machine is quick and moves rapidly.....

Fast forward 3 weeks and I have now fitted my GPS and oh my word the speedo over reads chronically! At an indicated 120kph im only doing 108 @ an indicated 160kph true speed 144 and the biggest leveler is at an indicated 220kph true speed is 200kph.  Effectively a 10% over read. Not sure if it annoys me or not. At least it will keep the speeding fines down  :deal:

The only way to keep the speeding fines down is not to know the speedo is 10% over reading  :lol8:

Its like setting your watch 5 mins ahead  >:D
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Offline armpump

Re: Africa 1000 Topspeed and speedo accuracy
« Reply #12 on: May 28, 2018, 02:10:13 pm »
Mph speedo is more accurate i read
 

Offline edgy

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Re: Africa 1000 Topspeed and speedo accuracy
« Reply #13 on: May 28, 2018, 02:18:19 pm »
With a 15t on my CS on the AT, the over read is closer to 17%
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Offline armpump

Re: Africa 1000 Topspeed and speedo accuracy
« Reply #14 on: May 28, 2018, 02:22:39 pm »



Option perhaps
« Last Edit: May 28, 2018, 02:23:12 pm by armpump »
 

Offline Leftless

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Re: Africa 1000 Topspeed and speedo accuracy
« Reply #15 on: June 03, 2018, 09:00:55 pm »
I found a bit of an anomaly..  With the speedo over reading by around 10% compared to my GPS, I found that the trip meter is surprisingly accurate - on a 220 KM leg the trip meter on the bike was 700m short compared to the GPS trip.
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