Incorrect Speedo?

[briggd01]

Anybody seen issues with there speedo and correct speed?

Mine seems to be out; at 90 on the speedo my snooper reads 85, and i've tested with 2 x different types of Snooper with the same results.

Any idea's?

 

[DPJ]

It is perfectly normal for all car speedos to over read. There has been much discussion about this on here.

 

[markoos]

Every speedo is out by some margin or other.

 

[ChrisUK]

Every car is mate - its the way they are all built

 

[BCM]

yup, ever car is, my old vts, 145 on speedo, 133 on Road angel!

 

[briggd01]

Cool, it's not just me then!

 

[stuart86]

join the club lol

mine is out aswell

 

[probee]

i've thought about this.... that means i'm putting more miles on my car than im actually doing... i think we should look at getting some compensation from Seat

 

[andycupra]

i've thought about this.... that means i'm putting more miles on my car than im actually doing... i think we should look at getting some compensation from Seat

not necessarily.

the speedo depends how the needle and print is manufactured on the dash is manufactured. this is a indicator and not actually the speed recorded.
the mileage id imagine is calcualted via the speed indicated by the ecu. (can be found on the aircon 'hidden read outs') which i believe reads more accurately.

the speedo is conservative as you would soon sue seat when you got done for speeding!

 

[JKM]

Most cars are out and its not just on VAG platform cars, we see it all of the time on our rolling road.
For example, the Rolling road lets us know 'true 70MPH' and it is not atall uncommon for cars to read wrong, and it is usually that they are over reading.

 

[RikH]

also will be out if you have aftermarket wheels on
if you go from 17-18 etc or width

 

[stuart86]

also will be out if you have aftermarket wheels on
if you go from 17-18 etc or width

not all the time tho

as if you increase wheel size but decrease tyre hieght you can get a same rolling overall diameter
theres online calculators to work this out

 

[briggd01]

join the club lol

mine is out aswell

Stuart86 - Where did you buy your Leon from? Wasn't SMC Datchet?

 

[Nutkin]

not all the time tho

as if you increase wheel size but decrease tyre hieght you can get a same rolling overall diameter
theres online calculators to work this out

Ahh but you can only get close. No two combinations are exactly the same.


The speedo on all cars overead by about 8% as industry standard due to the speeding part as it makes sure they arnt sued.

It is also , I think, partly to do with making you think the car is a bit sportier than it is.

Your cruising at 80mph on the motorway thinking yeah this is awesome when really your doing about 73-74.

 

[Deleted member 20482]

prob a bit of both...personally i think its the sat navs...baring in mind it has to go up in "space" and then ping back down... cant see how its that accurate..
it does it on my garmin..shows slower than my speedo
also had car tested on rolling road...mine is pretty well spot on...did it after speeding fine and i contested it in court..
somthing we have to live with

 

[Neg.]

ppersonally i think its the sat navs...baring in mind it has to go up in "space" and then ping back down... cant see how its that accurate..

10 nano seconds error in time, which equates to an accuracy of approximately 3meters. So personnaly, id say it has a minute part to play.....