| [ Total Views: 925 | Total Replies: 15 | Thread Id: 73245 ] |
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 1303Steve
A.k.a.: Steve Carter
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| posted on December 1st, 2008 at 10:32 PM |
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How accurate are GPS speedos?
Hi
I have a Garmin GPS that I use in my 2008 Toyota Hi Lux work ute.
According to speedo in the GPS the Toyota speedo is way out, at 110 kph indicated on the GPS speedo, while the Toyota speedo reads 120 kph.
Anybody have any thoughts?
Steve
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Brad
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| posted on December 1st, 2008 at 10:35 PM |
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The GPS should be accurate at speed
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11CAB
Compulsive Aussie Vee Dubber
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| posted on December 1st, 2008 at 11:17 PM |
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I've got numerous GPS units, and they all seem to agree with each other...... 
65 Meyers Manx
68 Country Buggy (KO 367)
68 Country Buggy (KO 669)
68 Country Buggy (KO 789)
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68 Baja Bug
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Sioux
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| posted on December 1st, 2008 at 11:52 PM |
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iv got a garmin nuvi 250w and have tested it in several cars against the speedo.
in a '06 falcon XR6 @ 60kph gps indicated the speedo was at 68kph
in a '07 mitsubishi express van @ 60kph gps indicated speedo was at 74kph, @ 100kph gps indicated speedo read 121kph
in a '03 mitsubishi magna @ 60kph gps indicated, speedo reads 54kph, @100kph gps indicated, 108kph
on a '06 520hp turbocharged nitrous suzuki hayabusa on a certain stretch of freshly laid bitumen @ 250kph gps indicated speedo read 251 kph. (i
wasnt riding it...bugger that ! )
i also used a navman 610 widescreen at the same time in the falcon, magna and van and both GPS's indicated the same speed. the garmin is a bit
slower to update the speed though.
oh i forgot to mention, after 39 years my beetle's speedo is spot on ! from 0kph to 130kph !
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VWCOOL
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| posted on December 2nd, 2008 at 12:25 AM |
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| Quote: | Originally
posted by 1303Steve
Hi
I have a Garmin GPS that I use in my 2008 Toyota Hi Lux work ute.
According to speedo in the GPS the Toyota speedo is way out, at 110 kph indicated on the GPS speedo, while the Toyota speedo reads 120 kph.
Anybody have any thoughts?
Steve
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Only 10km/h? sweeeeeet!
Pay your debts, CxxT
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eraser
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| posted on December 2nd, 2008 at 05:49 AM |
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The only minor problem is when they loose satellite connection they just guess, e.g tunnel or heavily treed area you can be doing 100 then slow down
to 20 and it will just assume your going 100 all the way (untill its next update)
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donn
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| posted on December 2nd, 2008 at 07:03 AM |
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oh i forgot to mention, after 39 years my beetle's speedo is spot on ! from 0kph to 130kph !
Yep, I had a car once that took nearly that long to get there.
My Garman Nuvi reads 3kmp faster at 70 on the speedo of the Crewman, at 100 k on the Crewman speedo the Garmin reads about 104, so I drive by the
Garmin (can no longer afford to get sprung, on a good behaviour licence)
I dream of a day when a chicken can cross a road without being asked for it's motive!
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rose
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| posted on December 2nd, 2008 at 07:09 AM |
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The gps is correct our Toyota Hilux is out the same as the car is made in Tialand what do you expect..
Only out huge like this in our Toyota. Other cars are only out by a couple of klms.
Haven't you noticed people going past you before you got your gps. As when your doing 100 on your speedo your really only doing 90 so your'll never
get booked for speeding.
| Quote: | Originally
posted by 1303Steve
Hi
I have a Garmin GPS that I use in my 2008 Toyota Hi Lux work ute.
According to speedo in the GPS the Toyota speedo is way out, at 110 kph indicated on the GPS speedo, while the Toyota speedo reads 120 kph.
Anybody have any thoughts?
Steve
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eraser
Fahrvergnugen
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| posted on December 2nd, 2008 at 04:37 PM |
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yeah the subarus and some toyotas are out by 10kms on purpose, something to do with speeding prevention.
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Baja Wes
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| posted on December 2nd, 2008 at 05:20 PM |
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They make them about 10% out. The ADR's allow up to 10% on the speedo. The funny thing is the ADR for the odometer has a finer tolerance, so the
odometer is more accurate than the speedo. Bikes are notorious for incorrect speed readings.
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Joel
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| posted on December 2nd, 2008 at 05:24 PM |
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out of over 8 speedos none of my dubs have ever had an inacurate speedo but thats only with the right rolling diameter tyres
worst they are out is no more than 1-2kms
the odometers on the otherhand.... dont think ive seen
one thats right
i think its cos there cable drive nothing really to go wrong
cars now are all electric- u can turn off ur ignition driving and the speedo stops working
bad voltage, dodgy sensors etc would give dicky readings
classic example, a mates fairmont crapped its alternator a few weeks ago,
he slowed down for a 60km/h speed camera and his speedo stayed on 110km/h
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1303Steve
A.k.a.: Steve Carter
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| posted on December 2nd, 2008 at 06:18 PM |
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Hi
Thanks for the replies.
When my son was learning to drive we fitted a digital speedo to his L bug/1303 that runs of magnet on the front hub. Its setup via a menu using the
tyre diameter, at 100kph on the GPS its only about 2 or 3 ks over, so I'm fairly happy with its accuracy.
While my son was on his Ls we would often get scowls from other learner drivers if we overtook them, as they probably thought we were speeding when in
fact if they were paying attention they were under the speed limit.
I would rather have my speedo spot on and then if I get booked its my fault.
Steve
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t2
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| posted on December 2nd, 2008 at 06:25 PM |
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GPS will be more accurate everytime , tyre wear will throw out your speedo reading.
i have a 2008 toyota hiace with a navman in it , the speedo reads 10 kph faster than the navman at 100kph , all the GPS has done is make me go faster
,that and i no longer look at maps
gravity wont get you high
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rose
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| posted on December 2nd, 2008 at 06:28 PM |
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So your car reads that you have travelled more than what you have so you get your car serviced more eg. every 10k you do you have really only
travelled 9k so every 100,000k you have really only travelled 90,000k so you miss out on 10,000ks of your warranty now I know why car companies do
this. and it also gives you a false fuel economy reading when you work it out as well.
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ratbug
A.k.a.: Andrew Todd
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| posted on December 2nd, 2008 at 06:56 PM |
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| Quote: | Originally
posted by eraser
yeah the subarus and some toyotas are out by 10kms on purpose, something to do with speeding prevention.
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Yep, I have the same problem with my 08 model subaru, I mentioned it when i got it serviced, and yeah got a statement from subaru saying they meet the
adrs and that they deliberately make them over read to get people to slow down. Load of nonsense. In fact, the car was a demo, when i found out it was
way out, i had thoughts that they might have fiddled with the speedo to make it appear to get up to speed quicker.
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ratbug
A.k.a.: Andrew Todd
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| posted on December 2nd, 2008 at 06:59 PM |
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Ohh and apparently the new adr's, speedo must read between 0% and (+10%+6km/h). In other words they can't read slower, but can read 10% plus another
6km/h over (116km/h reading at 100km/h is acceptable)
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