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        General >> Give/Need advice to/from others >> Speedo Accuracy
        
(Message started by: Scorp_Kev on Jan 29^th, 2012, 11:56am)

Title: Speedo Accuracy
Post by Scorp_Kev on Jan 29^th, 2012, 11:56am

Morning all.
Not a major problem really but just thought I would ask if anyone has had a similar problem.
While on a recent motorway trip I was using Satnav. At high speeds I noticed when my speedo was reading 80ish the Satnav was only reading 70. Only seems to be noticeable above 40 or so.

Any ideas ???

Title: Re: Speedo Accuracy
Post by Tompion on Jan 29^th, 2012, 1:10pm

On standard fitment tyres they're usually about 10% optimistic. Mine shows 33 at 30, 77 at 70 etc.

Title: Re: Speedo Accuracy
Post by PJDavis on Jan 29^th, 2012, 5:16pm

With the 225 16 tyres on the 12 spokes, mine is reading 33mph for a true 30mph, and funnily when the car is doing dead on the 100mph the sat-nav says 94mph and from that point on it seems to be 6mph out, car reading just over 125mph for a true 120mph.

Title: Re: Speedo Accuracy
Post by Scorp_Kev on Jan 30^th, 2012, 1:35pm

Thanks guys.
I will put up with it now. I suppose the sat nav reading is the most accurate though.

Kev

Title: Re: Speedo Accuracy
Post by Mike H on Feb 1^st, 2012, 1:48pm

Ditto here, I'd say up to 10% optimistic as well. Handy for when speed cameras are about though must be said ;D

As regards "put up with it", they're all like that as far as I can deduce LOL