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Topic: Speedo Accuracy (Read 568 times) |
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Scorp_Kev
Full Member
Scorp Ultima 2.3 1998
 
Posts: 221
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Speedo Accuracy
« on: Jan 29th, 2012, 11:56am » |
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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 
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2932
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Re: Speedo Accuracy
« Reply #1 on: Jan 29th, 2012, 1:10pm » |
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On standard fitment tyres they're usually about 10% optimistic. Mine shows 33 at 30, 77 at 70 etc.
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ABS multiplug wheel sensor pins MK IV or MK 20
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PJDavis
Senior Member
2 x 1995 Jag X300 3.2 / 4.0 (Henley) 1957 XK140
Posts: 1476
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Re: Speedo Accuracy
« Reply #2 on: Jan 29th, 2012, 5:16pm » |
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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.
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I love 'Movvy'
1995 Jaguar XJ6 X300 3.2 (Henley)
1995 Jaguar XJ6 X330 4.0 (Dopey)
1957 Jaguar XK140 USA (converted to RHD, and to have fitted Mk10 420G Engine with BW 65 Auto Trans)
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Scorp_Kev
Full Member
Scorp Ultima 2.3 1998
Posts: 221
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Re: Speedo Accuracy
« Reply #3 on: Jan 30th, 2012, 1:35pm » |
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Thanks guys.
I will put up with it now. I suppose the sat nav reading is the most accurate though.
Kev
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Speedo Accuracy
« Reply #4 on: Feb 1st, 2012, 1:48pm » |
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Ditto here, I'd say up to 10% optimistic as well. Handy for when speed cameras are about though must be said 
As regards "put up with it", they're all like that as far as I can deduce LOL
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Mike H
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