Author Topic: How do you calibrate for wheel tire size?  (Read 25034 times)

Offline Sugarqfx

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How do you calibrate for wheel tire size?
« on: July 07, 2012, 12:36:26 PM »
How do you calibrate for wheel tire size?

Offline shadescape

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Re: How do you calibrate for wheel tire size?
« Reply #1 on: July 08, 2012, 04:07:20 PM »
you find a hwy with mile markers
calibrate as per the manual

Offline Kees

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Re: How do you calibrate for wheel tire size?
« Reply #2 on: August 02, 2012, 02:53:11 PM »
Due to road works over time hwy mile markers may have been relocated and using them for distance calibration may not give you an exact result.
Another, quite convenient, way to calibrate distance is to use the speedometer of a GPS navigation device as a reference.
Adjust the distance calibration factor until the Ultragauge speed equals the speed reading of the GPS.
The higher the speed during calibration, the better the accuracy ;).

Kees

Offline subyroo

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Re: How do you calibrate for wheel tire size?
« Reply #3 on: August 02, 2012, 07:56:44 PM »
Due to road works over time hwy mile markers may have been relocated and using them for distance calibration may not give you an exact result.
Another, quite convenient, way to calibrate distance is to use the speedometer of a GPS navigation device as a reference.
Adjust the distance calibration factor until the Ultragauge speed equals the speed reading of the GPS.
The higher the speed during calibration, the better the accuracy ;).

Kees

Hi Kees,

Do you have a "Dummies How To" on 
Quote
Another, quite convenient, way to calibrate distance is to use the speedometer of a GPS navigation device as a reference.
for us challenged people.  :D

Offline Kees

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Re: How do you calibrate for wheel tire size?
« Reply #4 on: August 04, 2012, 12:12:24 PM »
Here we go

How to calibrate distance using a GPS and a calculator:

NOTE
This distance calibration method is based on using GPS speed.
GPS speed is most accurate when driving in a straight line at a constant speed.

Step 1: Add a speed gauge (e.g. on page 1 zone 1 of the Ultragauge)
            MENU  Gauge/Page Menu .. Select Gauge/Page .. Select Gauges  Select Page 1 Gauges
            Use UP & DOWN keys to Navigate to MPH or KPH
            Press MENU. This will cause the cursor to blink.
            Pressing UP or DOWN change the number to 1
            Press MENU to assign the Gauge to that Page 1 Zone 1.
            Leave the menu by selecting Back, etc
            The Ultragauge should now show the MPH or KPH on page 1
Step 2: Grab your calculator and your GPS navigation device, get in your car and head for the motorway.
Step 3: While driving at a constant high speed for at least a few seconds note down the speed readings of the Ultragauge and the GPS.
            The readings are probably different.
Step 4: Find a convenient place to stop, switch on your calculator and do the following calculation: GPS speed reading divided by Ultragauge speed reading.
Step 5: Adjust the "Distance cal." factor in the Ultragauge
            Menu - Vehicle Setup - Calibration - Calibrate Distance
            Note the distance value shown by Ultragauge and on the calculator multiply this by the factor found in step 4
            Press MENU and press UP or DOWN to adjust the distance value to the calculated value.    
            Press MENU to store the updated distance value. The Ultragauge now shows the new Distance cal. value
            Leave the menu by selecting Back, etc
            Switch off your calculator :)
Step 6: Take another drive on the motorway and check if the GPS speed reading and the Ultragauge speed reading at constant speed are now the same.
Step 7: If necessary make fine adjustments to the distance calibration value until GPS speed and Ultragauge speed are identical.


I hope this helps.

Kees

Offline shadescape

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Re: How do you calibrate for wheel tire size?
« Reply #5 on: August 05, 2012, 11:34:14 AM »
Kees- you of course haven't told the county that you say those mile markers aren't accurate-

name one state hwy with those green mile markers that aren't accurate

don't think you have a clue of how, why, and based on what- those markers are placed

Offline subyroo

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Re: How do you calibrate for wheel tire size?
« Reply #6 on: August 07, 2012, 02:00:35 AM »
Kees- you of course haven't told the county that you say those mile markers aren't accurate-

name one state hwy with those green mile markers that aren't accurate

don't think you have a clue of how, why, and based on what- those markers are placed

Shadescape, if you check Kees's profile you will see that he is in the Netherlands, not the USA.  :o  :o

Offline subyroo

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Re: How do you calibrate for wheel tire size?
« Reply #7 on: August 07, 2012, 02:17:52 AM »
Here we go

How to calibrate distance using a GPS and a calculator:

NOTE
This distance calibration method is based on using GPS speed.
GPS speed is most accurate when driving in a straight line at a constant speed.

Step 1: Add a speed gauge (e.g. on page 1 zone 1 of the Ultragauge)
            MENU  Gauge/Page Menu .. Select Gauge/Page .. Select Gauges  Select Page 1 Gauges
            Use UP & DOWN keys to Navigate to MPH or KPH
            Press MENU. This will cause the cursor to blink.
            Pressing UP or DOWN change the number to 1
            Press MENU to assign the Gauge to that Page 1 Zone 1.
            Leave the menu by selecting Back, etc
            The Ultragauge should now show the MPH or KPH on page 1
Step 2: Grab your calculator and your GPS navigation device, get in your car and head for the motorway.
Step 3: While driving at a constant high speed for at least a few seconds note down the speed readings of the Ultragauge and the GPS.
            The readings are probably different.
Step 4: Find a convenient place to stop, switch on your calculator and do the following calculation: GPS speed reading divided by Ultragauge speed reading.
Step 5: Adjust the "Distance cal." factor in the Ultragauge
            Menu - Vehicle Setup - Calibration - Calibrate Distance
            Note the distance value shown by Ultragauge and on the calculator multiply this by the factor found in step 4
            Press MENU and press UP or DOWN to adjust the distance value to the calculated value.    
            Press MENU to store the updated distance value. The Ultragauge now shows the new Distance cal. value
            Leave the menu by selecting Back, etc
            Switch off your calculator :)
Step 6: Take another drive on the motorway and check if the GPS speed reading and the Ultragauge speed reading at constant speed are now the same.
Step 7: If necessary make fine adjustments to the distance calibration value until GPS speed and Ultragauge speed are identical.


I hope this helps.

Kees

Thanks matey, I'll let you know how I get on.
We don't have distance markers (mileage/kilometer pegs) here in Australia and most road direction signs are not accurate either. We used to have mile markers but they went 'bush' with the introduction of the Metric system.

Offline shadescape

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Re: How do you calibrate for wheel tire size?
« Reply #8 on: August 07, 2012, 12:03:11 PM »
please accept my apoligies Kees

Offline Kees

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Re: How do you calibrate for wheel tire size?
« Reply #9 on: August 14, 2012, 11:53:35 AM »
Thanks Shadescape! My comment about accuracy of milemarkers was not relevant for the thread anyway...

I hope the alternative distance calibration method using a GPS is useful to other Ultragauge users.

Kees