beansbaxter
Needs a life
Posts: 5911
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posted March 17, 2004 10:33 AM
How much error is in a speedometer?
If the speedometer says you are going 180mph, how fast are you really going?
   
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frEEk
Administrator
ummm... yeah
Posts: 9660
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posted March 17, 2004 10:44 AM
depends on alot of factors. u have stock gearing? stock tire size & brand? changing either makes a diff. a good rule of thumb for a bone stock bike would be in the 10% area. i think i measured mine (against a bored cop with radar) at about 7%.
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Megabyte
Pro
Posts: 1047
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posted March 17, 2004 11:18 AM
quote:
If the speedometer says you are going 180mph, how fast are you really going?
On the dyno,(stock gearing, wheels) @ revlimit, speedo said 210 mph, Dyno said 194 mph which is about a .924 of my speedo's 210 mph.
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We First make our habits and then our habits make us.
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swft
Needs a life
Full throttle!
Posts: One MEEEEEELLION
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posted March 17, 2004 11:59 AM
Unless you get nabbed by state patrol...Then it reads 50mph slow. 
"But officer, my speedo said 70 mph! No way was I going 120!" 
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Hells Dark Lord
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living life, and loving it.
Posts: 7981
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posted March 17, 2004 12:12 PM
Beans the easiest way to get an accurate speed.....velcro a GPS on the upper clamp and use it as a speedo, or atleast to check and see what the error is, the GPS is accurate to within 1/10th of a MPH.....dropping one tooth in the front and using a190 rear tire, my speedo reads 63 MPH when the GPS says 55 MPH....
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When in doubt, lean farther and go faster....
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swft
Needs a life
Full throttle!
Posts: One MEEEEEELLION
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posted March 17, 2004 02:04 PM
Hold the speed steady when you do that. GPS speed may be accurate, but it's rate of change can't match what the bike can do. Run a steady speed for a minute, you'll have a good measurement.
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Hells Dark Lord
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living life, and loving it.
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posted March 17, 2004 07:02 PM
right on with that Swft....takes my GPS about 10 seconds to update.....others vary...I run the GPS on my bike all the time....Mine gives me and averages speed top speed miles traveled, direction location and speed currently traveling....my GPS is my key chain for my bike, and it velcros right on the top triple clamp....
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When in doubt, lean farther and go faster....
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beansbaxter
Needs a life
Posts: 5911
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posted March 17, 2004 07:10 PM
I wish I could find a bored cop with a radar.
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Hells Dark Lord
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living life, and loving it.
Posts: 7981
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posted March 17, 2004 07:25 PM
can buy a GPS for about 100 bucks....much cheaper than having mr popo tell you how fast you were going....lol...
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When in doubt, lean farther and go faster....
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EastBayDave
Needs a job
Posts: 2245
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posted March 20, 2004 07:25 AM
mine said 220 when it was actually 194 on the dyno....
KAW speedo's historically are 11-15% off.....
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Enjoy the ride!
02' ZRX1200
00' ZX12R sold
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Hawkman
Zone Head
Posts: 747
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posted March 20, 2004 11:31 PM
Speedo said 200. GPS said 180.
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beansbaxter
Needs a life
Posts: 5911
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posted March 20, 2004 11:33 PM
Well as soon as I type it up in my next thread, you will soon realize that my speedo must have some error in it, err at least the cop didnt believe me...
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Hells Dark Lord
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living life, and loving it.
Posts: 7981
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posted March 21, 2004 05:09 AM
they all have some error, my little ZX6RR is about 4 MPH off at 60, I am actually doing 56....my wifes bike is the same way....and it changes more and more with everything you do to it.....gears tires...etc.....
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When in doubt, lean farther and go faster....
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zrexpilot
Expert Class
Posts: 470
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posted March 23, 2004 07:50 PM
so if I go one down on the front, what can I do to correct the speedo. cause it will be way off.
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Hells Dark Lord
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living life, and loving it.
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posted March 26, 2004 08:33 AM
yellow box......I think Muzzy makes it.....
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When in doubt, lean farther and go faster....
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zx12richard
Pro
The Green Monster..
Posts: 1133
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posted March 26, 2004 08:48 AM
Black robotics makes the yellow box...
http://www.blackrobotics.com/
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Hells Dark Lord
Needs a life
living life, and loving it.
Posts: 7981
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posted March 26, 2004 01:08 PM
ok thank Richard....I wasnt sure....I do need to pick one up though.....
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When in doubt, lean farther and go faster....
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