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speedo accuracy ... aded video
- Thread starter STdemoniac
- Start date
good question
i`am don`t know, but should 225 45 R17` same hight as original tyre ok, if i open instrument shield, to get access to speed arrow , remove arrow, go to motorway, take a 70mph speed follow GPS and then put arrow exactly on 70mph ??
should after speed be correct from 0 to 70mph ??
i find one thread in another forum, ist possible to change something with vag-com, but i can`t find where these settings be ??
link to forum
http://www.ilexa.co.uk/forum/index.php?topic=27072.0
link to forum
http://www.ilexa.co.uk/forum/index.php?topic=27072.0
i fix on my LC 
open vag-com, select >>> 17-instruments >>> Recode-07 >>> the, on the first field (software coding) change last digit "4" to "5" and click Do It
after this folow speedo 60mph, folow GPS 60mph , also i try change last digit to "6" and be folow speedo 60mph, folow GPS 65mhp... to mach, so 5 ist ok
open vag-com, select >>> 17-instruments >>> Recode-07 >>> the, on the first field (software coding) change last digit "4" to "5" and click Do It after this folow speedo 60mph, folow GPS 60mph , also i try change last digit to "6" and be folow speedo 60mph, folow GPS 65mhp... to mach, so 5 ist ok
can you check at all legal speed limited roads.
30 40 50 60 70
that the speedo matches or is still slower than gps.
also what gps were you using? (yes i know all should read the same, but some update slightly slower than others.)
as with others, rather speedo be slower as less chance of being nicked by plod, but curious
30 40 50 60 70
that the speedo matches or is still slower than gps.
also what gps were you using? (yes i know all should read the same, but some update slightly slower than others.)
as with others, rather speedo be slower as less chance of being nicked by plod, but curious
Glad you got it sorted!
GPS is an american Military system, which incoporates one of the most accurate clocks in the world (about 8 of them I think, not just 1)
At any time that ANY GPS system has a signal it is connected to a minimum of THREE satelites out of the 8 that are up in space. This means that it is a VERY accurate measure of speed.
However many factors can influence the speed shown on a car speedo. Also, they sometimes set lower from factory so the car manufacturers cannot be accused of allowing people to get caught speeding.
The one reason that aircraft are not allowed to use GPS as a primary navigation source is that it is controlled 100% by the US armed forces and can be switched off whenever they fancy.
GPS is an american Military system, which incoporates one of the most accurate clocks in the world (about 8 of them I think, not just 1)
At any time that ANY GPS system has a signal it is connected to a minimum of THREE satelites out of the 8 that are up in space. This means that it is a VERY accurate measure of speed.
However many factors can influence the speed shown on a car speedo. Also, they sometimes set lower from factory so the car manufacturers cannot be accused of allowing people to get caught speeding.
The one reason that aircraft are not allowed to use GPS as a primary navigation source is that it is controlled 100% by the US armed forces and can be switched off whenever they fancy.
today i make a quick video, a bit shaky fottage, but still can see, speed same (or near same) compare with GPS
http://www.youtube.com/watch?v=c0GbLu0xVKE
http://www.youtube.com/watch?v=c0GbLu0xVKE
oldskool
Guest
accurate! I was however thinking, right here he goes and hes gonna show us his top speed accuracy test at 150 mph, but i guess the German roads were pretty busy.
Interesting. Thanks for doing that video. What is the android app that you are using? Is it called "SpeedView"? Might see how much variance there is in mine.
Cheers
JP
Hero. Risking your licence and your/other people's lives. If you are going to drive like a muppet best not to brag on the forum eh?
1. Speedos should not be off by any amount.
2. The tyres on a car may be over- or underinflated, may be worn or new, tracking may be spot on or off. All these influence speedo reading. In fact, manufacturers claim that any tyre fitted to a car must be in a 3% range of original size, because any size exceeding this would cause speedometer error.
3. Leon Mk1 speedos are (seemingly) electronic, there is no speedo cable. If so, they read speed via ABS sensors (electromagnets) and the speed on the dash has to be the same as indicated in the Climatronic secret menu (it's the same or at best a 2 kph difference).
4. After checking by comparison to a street radar which indicates speed, the dash speedo is spot on when tyres are new and properly inflated, even the slightest difference may cause a 3-5 kph misread.
5. GPS based sat nav systems have a wide error range because they update their position at large time intervals (15, 30 or 60 seconds), while the car moves and follows the road contour (curves, bumps, flat tarmac, then again a bump, slowing down, accelerating etc). The error in regard to position is about 50 meters on a cheap handheld navigator, enough to show you one corner when you're already at the next one.
6. For these reasons, the sat nav on a car running down a road has a larger error possibility compared to a true speedometer and should be trusted less, not more. If the same sat nav device is brought up in a plane, which flies a straight trajectory, with constant speed and constant altitude, it will read perfectly, because in the timeframe it takes to update the position the speed and trajectory of the plane do not change.
~Nautilus
2. The tyres on a car may be over- or underinflated, may be worn or new, tracking may be spot on or off. All these influence speedo reading. In fact, manufacturers claim that any tyre fitted to a car must be in a 3% range of original size, because any size exceeding this would cause speedometer error.
3. Leon Mk1 speedos are (seemingly) electronic, there is no speedo cable. If so, they read speed via ABS sensors (electromagnets) and the speed on the dash has to be the same as indicated in the Climatronic secret menu (it's the same or at best a 2 kph difference).
4. After checking by comparison to a street radar which indicates speed, the dash speedo is spot on when tyres are new and properly inflated, even the slightest difference may cause a 3-5 kph misread.
5. GPS based sat nav systems have a wide error range because they update their position at large time intervals (15, 30 or 60 seconds), while the car moves and follows the road contour (curves, bumps, flat tarmac, then again a bump, slowing down, accelerating etc). The error in regard to position is about 50 meters on a cheap handheld navigator, enough to show you one corner when you're already at the next one.
6. For these reasons, the sat nav on a car running down a road has a larger error possibility compared to a true speedometer and should be trusted less, not more. If the same sat nav device is brought up in a plane, which flies a straight trajectory, with constant speed and constant altitude, it will read perfectly, because in the timeframe it takes to update the position the speed and trajectory of the plane do not change.
~Nautilus
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