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        General >> Problems >> spedo inacurate
        
(Message started by: the_machine on Sep 14^th, 2006, 9:41pm)

Title: spedo inacurate
Post by the_machine on Sep 14^th, 2006, 9:41pm

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

Title: Re: spedo inacurate
Post by the_machine on Sep 14^th, 2006, 9:54pm

i mean the speedo reads too fast

Title: Re: spedo inacurate
Post by Kjetil S on Sep 14^th, 2006, 10:02pm

Speedo reading too high is normal. How fast are you going when it measures 6mph too much?

Title: Re: spedo inacurate
Post by TiberiuS on Sep 14^th, 2006, 10:18pm

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.

Title: Re: spedo inacurate
Post by nuttyscorp on Sep 14^th, 2006, 10:30pm

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

Title: Re: spedo inacurate
Post by the_machine on Sep 15^th, 2006, 1:03am

on 09/14/06 at 22:02:18, Kjetil S wrote:

Speedo reading too high is normal. How fast are you going when it measures 6mph too much?

hi,
im doin about 70 and it reads 76 error increases as speed does ( i guess a natural phenomenon)

Title: Re: spedo inacurate
Post by Kjetil S on Sep 15^th, 2006, 7:38am

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 ;)

Title: Re: spedo inacurate
Post by kev2scorps on Sep 15^th, 2006, 10:43am

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!

Title: Re: spedo inacurate
Post by taliban on Sep 15^th, 2006, 1:28pm

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....

Title: Re: spedo inacurate
Post by RobRob on Sep 15^th, 2006, 3:37pm

100mph on clock is 90mph. 70mph is about 65mph on mine.

Title: Re: spedo inacurate
Post by Snoopy on Sep 15^th, 2006, 7:57pm

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

Title: Re: spedo inacurate
Post by wickedteen on Sep 18^th, 2006, 4:50pm

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.

Title: Re: spedo inacurate
Post by Highlander on Sep 18^th, 2006, 5:04pm

No its the speedo ;D Satnav is more accurate ;D

Title: Re: spedo inacurate
Post by wickedteen on Sep 18^th, 2006, 5:09pm

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.

Title: Re: spedo inacurate
Post by Snoopy on Sep 18^th, 2006, 7:41pm

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.....

Title: Re: spedo inacurate
Post by wickedteen on Sep 18^th, 2006, 8:38pm

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 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Title: Re: spedo inacurate
Post by Kjetil S on Sep 18^th, 2006, 8:59pm

To give you an idea of how fast you are going. If you need something more accurate, you can get a good GPS speedo ;)

Title: Re: spedo inacurate
Post by TiberiuS on Sep 18^th, 2006, 9:42pm

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 :(

Title: Re: spedo inacurate
Post by Highlander on Sep 18^th, 2006, 11:00pm

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?? ;)

Title: Re: spedo inacurate
Post by howiedintheplace on Sep 18^th, 2006, 11:44pm

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.

Title: Re: spedo inacurate
Post by Highlander on Sep 19^th, 2006, 6:45am

"good evening Sir, do you know what speed you were doing there?"

"Hang on, i'll get my calculator" ;D

Title: Re: spedo inacurate
Post by howiedintheplace on Sep 19^th, 2006, 9:17am

;D ;D ;D ;D

Yeah would be funny that 8)

I meant if you want a idea of how far your speedo is out, you will see that the faster you go the more the speedo over reads ;)

Title: Re: spedo inacurate
Post by Highlander on Sep 19^th, 2006, 10:22am

So the rev counter would be quite accurate once you got it worked out what revs was what speed?

Title: Re: spedo inacurate
Post by howiedintheplace on Sep 19^th, 2006, 7:18pm

Yeah that's it.
I know that my Sierra 12V TT hits 150mph @ 5300rpm in top but the speedo is off the clock hitting the zero stop which would be about 170 - 180 if the numbers went that far ;D

Title: Re: spedo inacurate
Post by wickedteen on Sep 19^th, 2006, 7:35pm

oh! you becareful you dont get caught at that speed, lol

Title: Re: spedo inacurate
Post by howiedintheplace on Sep 19^th, 2006, 8:18pm

:D
Cars are too fast to go for it on the road but I do race up & down my local airfield a fair bit testing them.

I have hit 166mph so far, a bit more boost & I think I can crack 175mph ;D

The 24V TT will be 200mph capable in the right conditions. {} If I ever have the balls ;D