Speedo Healer

Honda Pan-European 2nd generation (Japanese design)

Re: Speedo Healer

Postby Critters » 07 Jan 2015, 16:22

steve974 wrote:
cammy_moir wrote:Never knew that, thanks. I wonder how the police spec models got around that problem?


We were only told that the speedos were calibrated but no techie details!


I remember that discussion in the office, you don't need to know how its done, its just done and the certificate to prove it is in that file.
Brian


Disclaimer: The above is probably bollox. If it sounds like advice or that I am knowledgeable, that is purely coincidental. Following anything suggested above may be detrimental to you health.
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Re: Speedo Healer

Postby WJBertrand » 09 Jan 2015, 05:25

Derek-Dex-French wrote:Fantastic contribution. Thank you Jeff.


All part of the regular service Derek!


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Re: Speedo Healer

Postby Gareth R » 09 Jan 2015, 12:53

WJB - same as mine so at least Honda are consistent in their error.
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Re: Speedo Healer

Postby alans1100 » 09 Jan 2015, 13:38

Our speedos by law can not over read

From 1 July 2006 all newly introduced models of a vehicle available on the market must comply with the following requirements:
•The speedo must not indicate a speed less than the vehicle’s true speed or a speed greater than the vehicle’s true speed by an amount more than 10 percent plus 4 km/h.
•The speedo must always read 'safe', meaning the vehicle's true speed must not be higher than the speed indicated by the speedo. So if a vehicle travelling at a true speed of 100km/h, the speedo must read between 100km/h and 114km/h. Another way of looking at this is if the speedo indicates a speed of 100km/h, the vehicle's true speed must be between 87.3 km/h and 100km/h.
•There is now no requirement to have an odometer

So we get the situation where 5 cars can do an indicated 100 k/h and the actual speed of each single car can be anything between 87.3 and 100 k/h.

My car on average reads 5 k/h less than indicated @ 100....compared to GPS
The bike will vary a little. The T30r GT spec gives a truer reading over the older BT 23.....93-4 for an indicated 100 K/h.
OzStoc Member ( http://www.ozstoc.com ) FarRider No. 921

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Re: Speedo Healer

Postby mbrST1100 » 09 Jan 2015, 16:50

In comparison with the GPS "speed over ground" indication the speedo on the ST1100 with 3" front wheel, 110/80 tire is pretty dead on...
With the partly serious optimistic offset of the speedometers in other vehicles I operate, this bears quite a risk when maintaining a +10kph routine... I shall not do that on my ST, when the thang displays 60 it already is 60 ;-)
Keep tires down, ATGATT, STOC# 637 (Sept.'97), PanEuro# 42 (Oct.'97), candy glory red '92 (sold), re-furbed '94 (wicked), strawberry '00 (daily)
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Speedo Healer

Postby WJBertrand » 09 Jan 2015, 19:14

My ST1100 had exactly the same percent error as my ST1300 has. One's mechanically driven by cable and the other electronic. Coincidence? Not likely. I too believe the error is deliberate and designed in. Martin, yours is the only ST I've heard of with an accurate speedo from the factory, but maybe Honda calibrates the metric ones more accurately??


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Re: Speedo Healer

Postby mbrST1100 » 09 Jan 2015, 23:06

WJBertrand wrote:...yours is the only ST I've heard of with an accurate speedo...

Methinks this is owned to dimension & circumference of the tire used... (Exedra in my case)

The speedo on the post '96 ST's with their 3.5" rim and 120/70 tire is also crooked...
Keep tires down, ATGATT, STOC# 637 (Sept.'97), PanEuro# 42 (Oct.'97), candy glory red '92 (sold), re-furbed '94 (wicked), strawberry '00 (daily)
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Re: Speedo Healer

Postby WJBertrand » 10 Jan 2015, 01:47

mbrST1100 wrote:
WJBertrand wrote:...yours is the only ST I've heard of with an accurate speedo...

Methinks this is owned to dimension & circumference of the tire used... (Exedra in my case)

The speedo on the post '96 ST's with their 3.5" rim and 120/70 tire is also crooked...


I had a '93 with the 110/80 front tire and Exedra's were also my favorite tires - still had the error, even had the same error with my second favorite tire which were the Avons available at the time. I sold that bike almost 10 years ago. Other STers that have gone through any kind of objective analysis, as I did, reported the same exact error within a few 10ths of a percent. Of course these were all US bikes with MPH speedometers.
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Re: Speedo Healer

Postby mbrST1100 » 10 Jan 2015, 12:30

WJBertrand wrote:I had a '93 with the 110/80 front tire and Exedra's were also my favorite tires - still had the error...
<snip>
Of course these were all US bikes with MPH speedometers.

Weird...compared with the Quest-I (as well as various, official [your speed is ... ] indicators to be found at city limits) the speedo of the prev '92 and the current '94 and '00 non-ABS ST's doesn't show more offset then the width of the pointer... in the 160kph/100mph range it starts to open to like 5kph/3.13mph optimistic...
Odd as the speedos of the cars do have noticeable >10kph/6.25mph optimistic readings... IMO designed to compensate the permissible various tire/dimensions... with the current winter tires the Toyota shows like +12~15kph/8.75mph... at indicated 70kph I'm only doing true 57, still safe within the safety margin of the speed cams over here...
I however must not do this stunt on the ST, the indicated 70 are like 69, within city limits enough to loose your license...

The instrument of a friend's '96 ABS-II is like >6kph/3.75mph optimistic, and I would need to inquire the guys owing a ST1300 about their clocked speedo offset...

I do have a dual display ST1100 speedo here, indicating kph and mph side by side, I've no idea if the increments on that are identical with a pure MPH unit, but did some samples:
30kph - per calculation 18.75mph, mph dial reads ~18mph
50kph - per calculation 31.25mph, mph dial reads ~30mph
70kph - per calculation 43.75mph, mph dial reads ~44mph
100kph - per calculation 62.50mph, mph dial reads ~64mph
120kph - per calculation 75.00mph, mph dial reads ~75mph
160kph - per calculation 100.00mph, mph dial reads ~102mph
180kph - per calculation 112.50mph, mph dial reads ~114mph
200kph - per calculation 125.00mph, mph dial reads ~126mph
240kph - per calculation 150.00mph, mph dial reads ~151mph

I'd have to install it into an ST to compare it to live GPS field readings... but besides the efforts I'm not sure it would be legal over here...
Keep tires down, ATGATT, STOC# 637 (Sept.'97), PanEuro# 42 (Oct.'97), candy glory red '92 (sold), re-furbed '94 (wicked), strawberry '00 (daily)
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Re: Speedo Healer

Postby Uncle Phil » 10 Jan 2015, 12:39

All three of my ST1100s are 'optimistic' also - two 1997s and one 2002.
97 ST1100 STD +150,000 / 02 ST1100 ABS +102,000/ 97 ST1100 ABS +65,000
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