Author Topic: Speedo error  (Read 9554 times)

Offline alans1100

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Re: Speedo error
« Reply #25 on: May 08, 2016, 09:14:11 PM »
My ST1300's speedometer is woefully inaccurate.  According to my GPS's, it under reads by around 5km/h to 10km/h (the faster I'm going, the greater the error).  If I never go over the posted speed limit (according to the speedometer), I don't think I would ever get a speeding ticket.


The under read is within ADR specs for a speedometer as annoying as it maybe.

http://www.racq.com.au/cars-and-driving/safety-on-the-road/driving-safely/speedo-accuracy

After 1 July 2006
From 1 July 2006 all newly introduced models of a vehicle available on the market must comply with ADR 18/03:
•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, and so there is no accuracy requirement


My current TomTom GPS gives me a speed of 97 K/H for an indicated 100 and 105 K/H for 110.
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Offline Gadget

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Re: Speedo error
« Reply #26 on: May 08, 2016, 10:16:53 PM »
My VW Golf displays 102 at 100 GPS.

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Offline ppopeye

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Re: Speedo error
« Reply #27 on: May 09, 2016, 08:59:27 PM »
Ruby's speedo is like most of the 13's. About 103 at 110 on speedoWoeful. Pearl the Landcruiser is 100 at 100, 110 at 110.
And 1CE the pug 308 is in between reads 104 at 100.

The speed check on the Western Hwy is operating but I found it to be intermittent


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Offline basadia

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Re: Speedo error
« Reply #28 on: May 12, 2016, 06:04:41 PM »
Got my speedo healer a couple of days ago, took a couple of hours to fit as I have never had the plastics off my 1300. Biggest issue was getting the cable through under the seat. Finally got everything in place and calibrated the unit as per the web site instructions and now the speedo is spot on by the GPS, very happy though at around $140 not the cheapest.
Keith
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Offline Gadget

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Re: Speedo error
« Reply #29 on: May 12, 2016, 08:25:58 PM »
Got my speedo healer a couple of days ago, took a couple of hours to fit as I have never had the plastics off my 1300. Biggest issue was getting the cable through under the seat. Finally got everything in place and calibrated the unit as per the web site instructions and now the speedo is spot on by the GPS, very happy though at around $140 not the cheapest.
Did you check with the GPS it at a variety of speeds?

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Gary
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Offline basadia

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Re: Speedo error
« Reply #30 on: May 13, 2016, 07:28:55 AM »
Got my speedo healer a couple of days ago, took a couple of hours to fit as I have never had the plastics off my 1300. Biggest issue was getting the cable through under the seat. Finally got everything in place and calibrated the unit as per the web site instructions and now the speedo is spot on by the GPS, very happy though at around $140 not the cheapest.
Did you check with the GPS it at a variety of speeds?

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I've checked at 60 and 80, have not had a chance to check at 110 on the freeway. I'm going for a ride on Saturday so I'll get back to you with the results but I'm confident that it should be good at higher speed.
Keith
05 ST1300
 

Offline Gadget

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Re: Speedo error
« Reply #31 on: May 13, 2016, 07:29:49 AM »
:popcorn

Being a calibration technician, I'm expecting it will be good. But I am curious.

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Gary
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Offline STroppy

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Re: Speedo error
« Reply #32 on: May 13, 2016, 07:56:57 AM »
Fitted the speedo healer back in 2013 . . . Have found it to be accurate at all speeds. Of course after a tyre change one should check it and recalibrate if necessary.  Be aware that the odometer/trip meters will underread by the same percentage as the adjustment made. Not a big concern to me, I just use the GPS tripmeter when needing to record distance . . As in FarRides etc . .
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Offline basadia

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Re: Speedo error
« Reply #33 on: May 13, 2016, 11:39:59 AM »
Fitted the speedo healer back in 2013 . . . Have found it to be accurate at all speeds. Of course after a tyre change one should check it and recalibrate if necessary.  Be aware that the odometer/trip meters will underread by the same percentage as the adjustment made. Not a big concern to me, I just use the GPS tripmeter when needing to record distance . . As in FarRides etc . .
so doesn't that mean the odometer will be more accurate with the speedo healer on as it is now reading the correct speed?
If the odometer is true to the speed then on average the speedo can be out by up to 10% then for every 10,000 ks you do it can be adding up to 1000 ks to your odometer.
I'll need to do one of those odometer checks they have on the freeway to test how accurate it is now.
Keith
05 ST1300
 

Offline Gadget

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Re: Speedo error
« Reply #34 on: May 13, 2016, 06:00:34 PM »
Fitted the speedo healer back in 2013 . . . Have found it to be accurate at all speeds. Of course after a tyre change one should check it and recalibrate if necessary.  Be aware that the odometer/trip meters will underread by the same percentage as the adjustment made. Not a big concern to me, I just use the GPS tripmeter when needing to record distance . . As in FarRides etc . .
so doesn't that mean the odometer will be more accurate with the speedo healer on as it is now reading the correct speed?
If the odometer is true to the speed then on average the speedo can be out by up to 10% then for every 10,000 ks you do it can be adding up to 1000 ks to your odometer.
I'll need to do one of those odometer checks they have on the freeway to test how accurate it is now.
Or use google maps or spotwalla over a longer distance.  The longer the distance the smaller the margin of error.
Cheers,
Gary
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Offline alans1100

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Re: Speedo error
« Reply #35 on: May 13, 2016, 07:39:12 PM »
Fitted the speedo healer back in 2013 . . . Have found it to be accurate at all speeds. Of course after a tyre change one should check it and recalibrate if necessary.  Be aware that the odometer/trip meters will underread by the same percentage as the adjustment made. Not a big concern to me, I just use the GPS tripmeter when needing to record distance . . As in FarRides etc . .
so doesn't that mean the odometer will be more accurate with the speedo healer on as it is now reading the correct speed?
If the odometer is true to the speed then on average the speedo can be out by up to 10% then for every 10,000 ks you do it can be adding up to 1000 ks to your odometer.
I'll need to do one of those odometer checks they have on the freeway to test how accurate it is now.
Speedo and odo have different tolerances. +/- 4 percent of distance where the speedo can be no more 10% plus 4 kph; if the speedo indicates a speed of 100km/h, the vehicle's true speed must be between 87.3 km/h and 100km/h.

Speedo healer might fix your indicated speed but not so much the odometer unless they allow for the difference in tolerances.
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Offline STroppy

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Re: Speedo error
« Reply #36 on: May 13, 2016, 07:46:07 PM »
so doesn't that mean the odometer will be more accurate with the speedo healer on as it is now reading the correct speed?
If the odometer is true to the speed then on average the speedo can be out by up to 10% then for every 10,000 ks you do it can be adding up to 1000 ks to your odometer.
I'll need to do one of those odometer checks they have on the freeway to test how accurate it is now.

I'm really not sure, the only thing I can think of is that vehicle manufacturers seem to be happy to have their vehicles speedos over read . . Probably because that means the vehicle operator cannot sue them if they happen to get booked for speeding. However the odometer/tripmeter should be accurate at the higher displayed speed. The link between the instruments that display speed and the distance travelled is fixed, so when, with the speedo healer, one adjusts the speed display to be accurate . . Usually down, then the odometer/tripmeters will also reduce their readings by the % adjustment made. At least this is what I have found with the speedo healer fitted to my ST1300.
Terry, Canberra 0412499625
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