Has anyone checked the accuracy of the speedo in the S2K. I have checked other cars without digital readouts and find that they over read by about 10% at the lower speeds and over read by about 20% at higher speeds . Due to the digital nature of the readout I was wondering if they are more accurate.


For those not in the know!

You can check speeds by timing along a motorway. There are 16 markers (the little white posts along the motorway) for every mile. Just time yourself. 60 mph shoue take one minute 90 should take 45secs!!

 

Being a little bit more techie, I've done 146mph on the speedo on a French motorway with the GPS saying it was 143mph - so that's pretty damn accurate!

Cheers

 

Mine is out for sure Varies - at about:
30 GPS says 28
40 GPS says 36
70 GPS says 64
78 GPS says 70

However there is somehting about GPS only measuring straigh lines, not bends and hills See my Origin vs Odometer thread - in search

 

On mine:

105 - GPS says 100
145 - GPS says 139

I remember this from a track day

 

Mines is similar to StevenM's and AE's, using GPS mine is out by 5% or so.

Cheers

 

Should have added that this is normal, all manufacturers build a 5-10% margin with speedo's, and they are always (should always) be set to over read.

 

Does this mean that when I think I am doing 85 I am only doing about 80? Must tell SWMBO about this so that my left ear gets a rest

 

Given that these are electronic thingies, surely there must be a calibration setting in there somewhere. I've had a look in the ESM (CD based service manual) and couldn't find anything, but am still convinced that there is an undocumented option to set it...

 

[QUOTE]Originally posted by AquilaEagle

 

on my snooper it reads

car gps.
30 29
50 48
60 59
70 69
100 98
130 128.

some of these are at heyford track.
but i can do 35 before the gps regesters i am moving.
so one of them is about 10% out.
dave