Speedometer Appears to Read 5-6 mph Fast

st1300r said:
recalculate
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Recalculate? No, nothing that fancy for me back then. You did the routing at home with lot's of waypoints and then the route was all 'straight line'. The maps were merely background information. But I do think you could search for an address.. and then it would draw a line 'as the crow flies' to the point. You had to try and zoom and scroll to see what streets would connect ya.

You was in the high-dollar market! Ya probably had a Pentium 2 also, didn't ya?

I still have a Delorme US map cd in my stack. Requires at least a 386 and 2x cd rom. A 486 and 4x cd is recommended.
 
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My speedometer reads 5% to 6% fast, depending on tire wear. And my odometer is within 1%, as determined from a ~3500mile trip odometer vs. GPS mileage gage.

I just ignore my bike's speedometer and my eyes naturally look at the GPS speedometer.

:shrug1:
 
TripleJ said:
I discovered this as well this weekend. On the way home from a camping trip, I had my wife go 70 MPH on the freeway so that I could check my speedometer. Sure enough, I was doing 76-77 MPH, not 70. I remember reading about this on different threads, but I figured it was only some bikes, not all of them. So now I definitely agree with the 10% number.
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A lot of cars I've owned aren't much better. Have you calibrated the car you compared to?
 
In the UK a speedometer may over read by up to 10% but may not under read....

This has been the case for a very long time.... this way if you are riding at 30 mph, you may be riding a anything from 27 to 30mph but not more....

My ST1100 speedo is actually quite accurate when compared with the Satnav, often being no more than 1-2 mph out at the higher end of normal speed limits, for example 71mph at a satnav speed of 70mph.
 
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Just another thought…
Build your own speed healer from a kit. Have some fun (solder your fingers together, talk to the saints, get your SO involved for some real front line action) while learning something new. The “mid-level build” electronic kit from Jaycar will modify the pulse width from the VSS that the ECM receives by (example 10%). The ECM does its calculation and now sends the corrected value to the speedometer.
There are 4 wires at the end of your build (ground, +12Vdc, VSSin, VSSout). You just need to splice into the VSS signal which can easily be done at the back of the motor down by the oil filter or other location of choice. The programming is straight forward through the use of two dip switches. (1’s & 10’s)
http://www.jaycar.com.au/productView.asp?ID=KC5435&form=CAT2&SUBCATID=965#11
Nick

I just ignore and collect performance awards. It's a great way of meeting new people.
 
No, as usual having had my early evening post meal nap, my head is in neutral..... the actual speed on the satnav is always a little less than indicated on speedo.... but never by much.....

Fixed that in the post too....

Duh.
 
mageerc said:
I don't think I've ever owned a bike that had an accurate speedometer...
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I've seen a few that were dead-on accurate from the factory. My ZG1000 was right on and my XR650L is accurate until I tear enough knobs off the front tire. :)
 
Fearmor said:
the st1100 is the same,I,v checked it with my GPS.
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Hi Pat, how is the new st doing, I hope you get the old one going again,fitted new headlight bulbs today,very awkward job but got it done,put in osram nightbreaker plus bulbs.
I wouldn't even attempt the kind of repairs you undertake,good luck with the test 2moro
 
two_wheeled said:
I've seen a few that were dead-on accurate from the factory. My ZG1000 was right on and my XR650L is accurate until I tear enough knobs off the front tire. :)
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Its been a long time, but I seem to recall that in those dark days of 1980-82 when the US speedos only went to 85mph max, they were actually pretty accurate in the range they covered. There was no GPS to calibrate with back then, and when you were going 62 to keep from getting a ticket, maybe you were really going 58 and didn't know. But it seemed to me that about the same time the speedos got 'normal' again and could go as high as they wanted, that's when the big, obvious calibration errors seemed to show up.
 
Our 2011 Rav4 is the first car we've owned since the dawn of the GPS age that has a dead nuts on speedo.
 
dwalby said:
Its been a long time, but I seem to recall that in those dark days of 1980-82 when the US speedos only went to 85mph max, they were actually pretty accurate in the range they covered. There was no GPS to calibrate with back then, and when you were going 62 to keep from getting a ticket, maybe you were really going 58 and didn't know. But it seemed to me that about the same time the speedos got 'normal' again and could go as high as they wanted, that's when the big, obvious calibration errors seemed to show up.
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As measured against GPS the 85 mph speedometer on my 1981 BMW R100 is fairly accurate - 60 mph indicated is about 59 mph - but even that is off 2%. The example of 58 vs 62 is 6.5% which is very close to the measured error of 7% my ST1300 exhibits.
 
I read somewhere the industry standard is + or - 5 mph at 50 mph for speedometers. I have the speedohealer and am at piece with the road and will gladly buy another one for the next mc if needed.
 
The speedo on my ST1300PA is dead-on-accurate. You would Honda could do the same with the civilian model.
 
This subject comes up often. Maybe twice, three times a year.
 
Tom has it right.

Honda engineers can do it *exactly* right and Honda choice is to not provide civilian models with accurate speed indicators...
 
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