2nd Gen R56 Cooper Speedo Innacuracies

My Garmin will only show the speed when I do not have a route programed in, or if it will I don't know how to make it. Then it shows ETA in the lower left corner. I notice a slight lag in the numbers between the Garmin and the scan guage at times by one mph. Then they catch to to each other.

Jim

 

I could understand it if you lost satellite signal, but this was with all five signals.

 

Jim, I don't know which model Garmin you have, but you can touch the screen in the right spot even when you have a route plugged in and it will switch screens to one that gives speed, along with miles traveled, miles to go, time etc. I'll have to go look at my wife's 660 to give you more accurate instructions as I've gotten used to my 1490T, which works slightly differently....

 

Thanks, I'll try that. I have the 760 and it most likely does a lot of things I have not figured out yet.

Jim

 

That's correct - or at least they mustn't read under. So all manfacturers set the average speedo readout above true speed so that production variations never let them go under true.

For the statisticians, I read once that they are allowed less than 3 standard deviations to read under true speed (which would be an intelligent way to define compliance) but I've never seen that again.

 

Well, as I've noted several times - they don't ALL do it. All BMWs and MINIs might, but I've owned my share of new MBZ, Audi, VW and Jaguars, and they were all pretty much dead on. Likewise my Lexus cars and new Toyota trucks have all been pretty much dead on too.....

 

Tested my new 2011 S against my GPS. MINI indicates 3 MPH higher than actual speed by GPS. Just one more experience to factor into the mix......

Kent

 

Get a Scan Gauge. It will give you MPH and let you adjust it up or down so that it is correct. Not sure if the Garmin will do that or not.

Jim

 

No.

Mark

 

I guess that fits under the heading of, "garbage in, garbage out". :cornut:

Jim

 

Why would it need to?

the Garmin gets the speed from GPS data.... It shouldn't need scaling... So I guess it's more of "good data doesn't need a fudge factor."

Matt

 

You bring up an interesting point Doc. The Garmin can get mph data on its own, but Mark is using the HD device that sends the information to the Garmin via the OBDII port, using blue tooth. Can the Garmin separate what it gets from where?

Jim

 

I have no clue...

but I would hope so! It would be just dumb if it couldn't...

Matt

 

With just the Garmin GPS you see speed from satellite tracking , if you get it from the OBD via the HD guages you get from the car, which is the same as the speedo. The OBD feed is only seen on the gauges screen.

Mark