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the_machine
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spedo inacurate
« on: Sep 14th, 2006, 9:41pm » |
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anyone know how to calibrate the speedo (if poss)
97 cosworth
its about 6mph out.
according to my sat nav anyway, it does feel wrong, it shows im going faster than i am
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the_machine
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Re: spedo inacurate
« Reply #1 on: Sep 14th, 2006, 9:54pm » |
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i mean the speedo reads too fast
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TiberiuS
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Ex. 1996 2.3 Ultima - RIP P789 KHJ
 
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Re: spedo inacurate
« Reply #3 on: Sep 14th, 2006, 10:18pm » |
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Well, one thing which I don't think can lie, you should be getting 2650rpm@70mph in overdrive, overdrive (at least on the 2.3) should kick in at 50mph if your foot isn't too deep in the pile 
hth, Bruce.
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Bruce - '07 Jaguar XKR coupe, '95 Jaguar XJ Sport 4.0, '82 Ford Capri 2.0 Ghia, '15 Honda Civic (sloooooww..)
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nuttyscorp
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1998 (R) 2.3 ultima
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Re: spedo inacurate
« Reply #4 on: Sep 14th, 2006, 10:30pm » |
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its not uncommon for ford speedos to show up to 10% higher than actual speed, so 66mph could well be 60 mph (ish), with all the cameras and speed traps on the roads, i'd be inclined to leave it as it is.
Russ
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the_machine
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Re: spedo inacurate
« Reply #5 on: Sep 15th, 2006, 1:03am » |
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on Sep 14th, 2006, 10:02pm, Kjetil S wrote:| Speedo reading too high is normal. How fast are you going when it measures 6mph too much? |
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hi,
im doin about 70 and it reads 76 error increases as speed does ( i guess a natural phenomenon)
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Kjetil S
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2001 BMW 520iat
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Re: spedo inacurate
« Reply #6 on: Sep 15th, 2006, 7:38am » |
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Mine is close to 5km/h off when approaching 100km/h, so I guess yours is normal
I do actually believe this is a feature, not a bug, atleast on Norwegian ones, as this has been common on just about every car I know of, and it is usually better to be driving slightly slow then to get a speeding ticket
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http://uncyclopedia.org/wiki/Norway
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kev2scorps
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Re: spedo inacurate
« Reply #7 on: Sep 15th, 2006, 10:43am » |
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I noticed about a 5km/h difference between my Navman display and the car display at 100km/h also.
I have also noticed that if I set the car at 60mph on cruise, and swap the trip computer to average speed, then reset it, my trip computer gives an average speed of 58mph!
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2L 16V, 2.3 GHIA SALOONS,2L 8V GHIA EST 2L GRANNIE
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taliban aka Cheekyboy2
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Re: spedo inacurate
« Reply #8 on: Sep 15th, 2006, 1:28pm » |
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speedo inaccuracy on cars and bikes is common, and its normally a 'rising rate' i.e. 1mph out at 30 might be 4 or 5 at 70....
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RobRob
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Re: spedo inacurate
« Reply #9 on: Sep 15th, 2006, 3:37pm » |
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100mph on clock is 90mph. 70mph is about 65mph on mine.
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Snoopy
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Re: spedo inacurate
« Reply #10 on: Sep 15th, 2006, 7:57pm » |
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It would appear that the Ford Speedo'd on ALL the scorpios are on average 10% out ( read Fast ) all the way up the scale from 10mph to legal limit .
It is a well know and published problem and AFAIK NOT fixable.....
unless you are preapred yo get a calibrated speedo and they cost hundreds
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wickedteen
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sorry guys, its not your speedo its the satnav, i have noticed this on a lot of cars the speedo reading faster then the satnav, its a common thing and nothing to worry about.
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Highlander
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Re: spedo inacurate
« Reply #12 on: Sep 18th, 2006, 5:04pm » |
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No its the speedo  Satnav is more accurate
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on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
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wickedteen
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so if you get caught speeding i dont think that if you went to court they would accept that your satnav was saying you were doing 70mph when your speedo says 80mph, personally i think there are too many satnav's now and they are giving in accurate information.
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Snoopy
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Re: spedo inacurate
« Reply #14 on: Sep 18th, 2006, 7:41pm » |
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If you check the speedo against the trip computer by reseting the av speed whilst on cruise control you will find that the speed on the speedo is actually reading 10% faster that the trip computer.....
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wickedteen
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so is it worth getting your speedo calibrated , cos would they do it properly or just put back to how it already is "advanced". so really what is the point in having a speedo if its not going to be accurate !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Kjetil S
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2001 BMW 520iat
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Re: spedo inacurate
« Reply #16 on: Sep 18th, 2006, 8:59pm » |
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To give you an idea of how fast you are going. If you need something more accurate, you can get a good GPS speedo
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http://uncyclopedia.org/wiki/Norway
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TiberiuS
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Re: spedo inacurate
« Reply #17 on: Sep 18th, 2006, 9:42pm » |
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So all those times I think I'm being a little devil by doing 34 in a 30 past the cameras, I'm really only doing 30?
I feel really deflated now 
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Bruce - '07 Jaguar XKR coupe, '95 Jaguar XJ Sport 4.0, '82 Ford Capri 2.0 Ghia, '15 Honda Civic (sloooooww..)
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Highlander
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Re: spedo inacurate
« Reply #18 on: Sep 18th, 2006, 11:00pm » |
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This is why the police dont normally charge you for speeding until you are doing 10% + 2mph over the limit, because by then your speedo is showing you are speeding for definite including the "error"
if they clock you at 70 your speedos probably showing nearly 80 and they know it..
ever been stopped and the speed they quote you as doing is less than you thought??
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on Oct 17th, 2011, 12:35pm, Simmo wrote:| I give up ! Too much for an old boy! |
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howiedintheplace
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Re: spedo inacurate
« Reply #19 on: Sep 18th, 2006, 11:44pm » |
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If you have no fancy gadget then use your rev counter to work out your speed based on your transmission ratio's & tyres. It will be closer than your speedo
Do a search to find a calculator.
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Dave
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