R7 gps speed (1 Viewer)

Capstick

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Has anyone tested the accuracy of the gps speed on the R7?
 

doubledge

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Only observing my Spedo and the R7 and they are typically within 1 mph of each other.
 

wjbertrand

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Assuming the speed on my Garmin is accurate, which I believe to be a very good assumption, then the speed shown on the R7 is dead on.


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DC Fluid

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I have run 6 GPS units at the same time.
Phone, Garmin x2, detectors x2, and Ford Sync GPS.
They are all within 1 kph of each other, other than when your speed is changing, refresh rates of the different devices result in a second or two lag time until they adjust.
I use them to calibrate my speedometer for tire size differences winter/summer sets.
All very accurate.
 

Capstick

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Thanks mine is off by 7mph. This is due to tire size. I was just curious on accuracy.
 
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apple2gs

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Has anyone tested the accuracy of the gps speed on the R7?
My R7 always shows 1 mile per hour faster then I am driving. I tested my speed at many "Speed Signs", and other cars driving with me.
 

DC Fluid

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All these GPS speedometers will also round up to the next mph when over by 1/2 mph.
Pretty good results, within 1 mph or kph to any speed signs I get.
 

VariableWave

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My R3s and R7 are 1.5 - 2 mph over the true mph. Many devices are including the vehicle itself. This is maybe for two reasons... 1. tire wear, as the tire wears down to be within the tolerance..2. faster for vehicle to end warranty. Over time I did a calculation that over time per miles driven and time period, I would drive about 140+ miles more. To correct that, I dropped down from 40series to 35 series and near corrected that change.

When running Radar/Laser targeting, this has reflected that change as well.

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awyeah2

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It’s dead-on for me.
 

user

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Thanks mine is off by 7mph. This is due to tire size. I was just curious on accuracy.
Do you mean that you think your R7 gps speed is off by 7 mph due to tire size?
 

Capstick

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My truck speedometer is off due to adding 35” tires. It reads 7 mph slower than the R7
 

awyeah2

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You may want to compare it to another device (like your phone) that uses GPS to display speed.
 

UnidenSupport

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A few MPH off is perfectly normal. This all depends on environmental factors.
 

wjbertrand

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I don't see how changing tire size can affect GPS speed, it would only affect the speedometer of the vehicle itself. In my experience most cars and motorcycle speedometers indicate higher than actual speed.
-- Double Post Merged: --

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My R3s and R7 are 1.5 - 2 mph over the true mph. Many devices are including the vehicle itself. This is maybe for two reasons... 1. tire wear, as the tire wears down to be within the tolerance..2. faster for vehicle to end warranty. Over time I did a calculation that over time per miles driven and time period, I would drive about 140+ miles more. To correct that, I dropped down from 40 series to 35 series and near corrected that change.

When running Radar/Laser targeting, this has reflected that change as well.

Sent from my VS996 using Tapatalk
Dropping tire profile (aspect ratio) will reduce overall wheel/tire diameter and would result in more revolutions per mile thereby worsening over-mileage and overspeed error (as indicated on the vehicles odometer) rather than correcting for it

I would trust GPS speed to be more accurate than the vehicles speedometer.
 
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Irondad

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Thanks mine is off by 7mph. This is due to tire size. I was just curious on accuracy.
If your tire size is changed your speedometer is off, not your R7. Try something like Waze and see how that speed compares to your R7. Waze uses the phone's internal GPS and the R7 uses its internal GPS.
 

VariableWave

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Dropping tire profile (aspect ratio) will reduce overall wheel/tire diameter and would result in more revolutions per mile thereby worsening over-mileage and overspeed error (as indicated on the vehicles odometer) rather than correcting for it

I would trust GPS speed to be more accurate than the vehicles speedometer.
Here is my calculations for the other year... Did the number crunching (Speed Error so reverse the to) to correct the offset of MPH... ran them for a year, and then looked to change over to 17... so did that calculations, and now running 17x235 45 on the car.. got them numbers crossed.
1564022124401.png
 
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