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Topic: Speedo reading out (Read 386 times) |
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macattack
Newbie
'97 2.3 Ultima Estate
Posts: 12
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Speedo reading out
« on: Jul 25th, 2005, 11:00pm » |
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anyone find the speedo reading out on their Scorp?
got a new road angel the other day and fitted it, road angel is reporting the speedo to be about 10% slow (according to the road angel) timed the car over a measured mile and yup it appears to be off.
strange thing is that if i reset the average mph while the cruise is set to 60 on the road angel the electronic averge mph read's 60 even though the needle is saying 67!!
I have check the tyre sizes and have the correct 225-50-16's fitted but even if they were changed and the originals were the 205-55-15's it would be 10% off the other way??
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Geoff_W
Senior Member
98 Ulti2.5tdi Auto
Posts: 1340
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Re: Speedo reading out
« Reply #1 on: Jul 25th, 2005, 11:06pm » |
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Welcome 
Yes you spotted it, you have been 10% more law abiding than most other motorists.
Interesting variance using cruise, usually the in dash computer shows accurate measurement when reset.
Seems to be a standard undocumented feature across the range.
Geoff
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The winding road goes on and on... or at least it does in Northumberland
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Paul B
Senior Member
'98 24V Ultima saloon
Posts: 2442
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Re: Speedo reading out
« Reply #2 on: Jul 26th, 2005, 7:22am » |
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Yes, Geoff's right. They all do that. So don't worry about your tyre size.
Still, if you stick to what it says on the speedo, at least you won't get a ticket. 
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Two hundred & seven horses and only one jockey!
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Fitzy
Full Member
WILMAAAAAAA !!!!!!!!!!!!
Posts: 254
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Re: Speedo reading out
« Reply #3 on: Jul 26th, 2005, 2:44pm » |
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You'll find that nearly all cars speedo's show you are going faster than you actually, because this is a legal requirement for all production cars, to read faster than the true speed, so that you do not go over the speed limits unless you intentionally mean to do so. My Navman Sat-Nav also shows a figure about 10% less than my speedo and i have used the SAt-Nav in my Scorpio, a Lincoln Towncar Stretch Limo and a 50 seater coach although the coach was only out by about 2 miles per hour, any vehicle fitted with a tachograph has been speed calibrated for the tachograph machine.
HTH
Fitzy  
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DON'T KNOW HOW OR WHY I DO IT......BUT I LOVE IT...........
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nitram
Junior Member
'96 2.0 16v Ultima - Loden Green
 
Posts: 74
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Re: Speedo reading out
« Reply #4 on: Jul 26th, 2005, 3:38pm » |
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Same here, Speedo shows a speed 10% lower than the Trip computer and TomTom.
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macattack
Newbie
'97 2.3 Ultima Estate
Posts: 12
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Re: Speedo reading out
« Reply #5 on: Jul 26th, 2005, 9:44pm » |
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cheers all, guess i'll be driving by the road angel or tach from now on!!
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Dave
Senior Member
Tourmallard 24v (ex-owner)
Posts: 1984
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Re: Speedo reading out
« Reply #6 on: Jul 27th, 2005, 6:33pm » |
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I like the fact it's so out. I do '80' on the motorway, which is really only about 72, and passengers will often say "ooh, isn't it quiet at 80 miles an hour?"
Yeaassss.
D
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Life after the Scorpio ain't easy..
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