How accurate is the SV speedo?

[mikerj]

Originally Posted by kaivalagi

Good to know, the newer dashs are digital rather than the old fashioned wind up things so it would make sense they are accurate in distance and inflated in speed

It doesn't make any difference, there is no inherent reason why a digital odometer would be more or less accurate than a mechanical one. A mechanical speedometer is different as it relies on the strength of magnets and a hair spring and has precision bearings that get gunked up over time, so accuracy is inevitably compromised, but an odometer is a simple geared system with no opportunity for the calibration to move other than through normal tyre wear/inflation or failure of some internal part.

[kaivalagi]

I am not sure you got where I was coming from, based on earlier posts?

Firstly can we assume a new type dash which has a digital speedo doesn't compromise the digital odometer even though it is 9% more than actual speed...i.e. if it reads 77mph even when doing 70 will the odometer still track correctly and record 70 miles for an hours travel or will that also be inflated by that 9/10% margin too?

I was suggesting if the odometer was accurate on a new dash even with this inflation would the older type still suffer as the odometer was driven by the speed recorded?

Please enlighten me though as I am only making assumptions....would the odometer be inflated by 10% just like the speedo regardless of tech or not?

Time for a road trip. Someone? Anyone? I can't do it, they wouldn't let me bring mine to Afghan land.

[squirrel_hunter]

Originally Posted by sath182

Confirmed with GPS that my '09 is 9% fast while on a trip around the States.

Originally Posted by kaivalagi

I can confirm also from my GPS on the pointy, 77 actually 70, 66 actually 60 etc...

What makes you so sure your GPS is accurate?

depends om tyre size does it mmmmmmmmmmmmmm
my thou runs off the gears

[kaivalagi]

Originally Posted by squirrel_hunter

What makes you so sure your GPS is accurate?

mmmm, because it's GPS, granted accuracy for position for civvy land is not the best but at speed it's plenty good enough...and if more than 1 of us are getting the same results then that's confirmation enough for me

Originally Posted by kaivalagi

mmmm, because it's GPS, granted accuracy for position for civvy land is not the best but at speed it's plenty good enough...and if more than 1 of us are getting the same results then that's confirmation enough for me

+1, my V7 sat nav and my Samsung GPS smartphone and a colleagues HTC GPS smartphone agreed to one decimal point what the speed was on a motorway (though they quite possibly use the same GPS chipset), when using cruise control. It was a long journey, and we were bored!

Bluepete has said in the past that his TomTom is bang on compared to the calibrated speedos in his job cars.

We could get into a whole argument about how accurate they are for positioning or altitude (you only need to speak to someone who does geocaching to know that one can be 100 metres out from the reading of another, not that I understand why), but when it comes to measuring a constant speed, they are accurate enough for my needs.

[kaivalagi]

Next time out on the bike (and if I remember) I'm going to use my android phone to record my route using "My tracks" or similar so I can find out the distance travelled versus what the trip meter says...or use the tomtom if it has the feature (?). I am just not convinced either way if the odometer on the bike is accurate or inflated like the speedo....if inflated I'd say getting a speedohealer might be cost effective if you use your bike a lot!

Originally Posted by kaivalagi

Next time out on the bike (and if I remember) I'm going to use my android phone to record my route using "My tracks" or similar so I can find out the distance travelled versus what the trip meter says...or use the tomtom if it has the feature (?). I am just not convinced either way if the odometer on the bike is accurate or inflated like the speedo....if inflated I'd say getting a speedohealer might be cost effective if you use your bike a lot!

+1 I like this idea. Hadn't really thought of it. Just remember to reset your trip

[squirrel_hunter]

Originally Posted by kaivalagi

mmmm, because it's GPS

And you know thats accurate because?

Originally Posted by kaivalagi

granted accuracy for position for civvy land is not the best but at speed it's plenty good enough...

Now I know that position for civilian applications is not as accurate as it could be (based on first hand system developer accounts), so why would the speed be?

Originally Posted by kaivalagi

and if more than 1 of us are getting the same results then that's confirmation enough for me

And may I present to you:

Originally Posted by sath182

Confirmed with GPS that my '09 is 9% fast while on a trip around the States. Breakes it in to factors of eleven; 55=50, 77=70, etc.

Originally Posted by kaivalagi

I can confirm also from my GPS on the pointy, 77 actually 70, 66 actually 60 etc...

I'm just wondering you see if by your reasoning more than one has the same results, how do you know which one is accurate, the GPS or the speedo? And based on what?