Jamie
Member
Registered: 1st Apr 02
Location: Aberdeen
User status: Offline
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Only 2mph out 
Megane Coupe on 17s
Quite suprised as L33LEG thought it would be +10(ish) and I thought it would read faster than you were.
Anyway **mph past a "Safety" camera. Am i to expect an SP30?
Dont normally speed as such but was late for college and traffic was moving faster than normal.
[Edited on 17-05-2005 by J-Me]
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ed
Member
Registered: 10th Sep 03
User status: Offline
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Mines exact up to 70mph, at about 77 though it is really meant to show 80 and then on I don't know because my car doesn't go any faster than that.... Thats with 18's on too.
[Edited on 17-05-2005 by 1800ed]
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Jamie
Member
Registered: 1st Apr 02
Location: Aberdeen
User status: Offline
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Ah well was in the wrong no biggy
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Skinz
Member
Registered: 15th May 03
User status: Offline
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gps receivers arent 100% accurate, although theyre a darn sight more accurate than the speedo
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Richie
Member
Registered: 3rd Dec 02
Location: Newport, Wales
User status: Offline
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All depends on the quality of the GPS reciever.
For example, my gps mouse that i bought is accurate to feet, the GPS equipment that ordinance survery people used are accurate to 2cm
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Skinz
Member
Registered: 15th May 03
User status: Offline
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that aint how it works richie, its takes a reference from up to 11 satellites and uses "points" to work it out from so it doesnt matter how accurate the gps is to your current location if all 11 satellites have the same margin of error its very accurate, most gps receivers arent any more accurate than 10 meters, i dont believe your mouse is accurate to feet as it would cost thousands, the ones the council use to locate drains n stuff are accurate to 1 meter and they cost Łkkk's trust me
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John
Member
Registered: 30th Jun 03
User status: Offline
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Its for security purposes they aren't accurate to cm. The maths to work it out from a few satellites are probably extremely easy.
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garyelphick1
Member
Registered: 21st Apr 05
Location: Eastbourne
User status: Offline
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speedos are made so they are 1-2 miles out check it on any camera!
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James_DT
Member
Registered: 9th Apr 04
Location: Cambridgeshire
User status: Offline
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10 metres accuracy is still small when you're talking miles.
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Icy
Member
Registered: 31st Jan 01
Location: Edinburgh Drives: Mk3 Golf Gti
User status: Offline
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mines usually 5mph out
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1.4__SRi
Banned
Registered: 14th Apr 05
User status: Offline
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quote:
Originally posted by garyelphick1
speedos are made so they are 1-2 miles out check it on any camera!
er every car iv been in the speedo has overread buy about 10%, some are more accurate than others, i dont know how you can claim speedos are made 1-2 miles per hour 
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ed
Member
Registered: 10th Sep 03
User status: Offline
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quote:
Originally posted by 1.4__SRi
quote:
Originally posted by garyelphick1
speedos are made so they are 1-2 miles out check it on any camera!
er every car iv been in the speedo has overread buy about 10%, some are more accurate than others, i dont know how you can claim speedos are made 1-2 miles per hour
The speedo is driven by a pick up from the gearbox. The gearbox turns the final drive, which is the wheels in this case. If you change size of the wheels on a car you are changing the final drive ratio. This normally remove some of the inaccuracy thats built into the speedo's set up. So it makes your speedo under read less, or in some cases over read. Also, not all speedos are exactly 10% out, thats the legal maximum limit for under and over reading, but not all speedos are the same...
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1.4__SRi
Banned
Registered: 14th Apr 05
User status: Offline
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isnt that what i was saying, just without how it all works 
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Rebrabuk
Member
Registered: 28th Mar 04
Location: North East
User status: Offline
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At 120mph on my speedo, RoadAngel says 117mph. Police speed camera also said 117mph..
Not quite 1-2mph out, but only 3mph.. 
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L33 LEG
Banned
Registered: 6th Jan 03
Location: Blackburn . Drove: Dimma Saxo VTR
User status: Offline
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quote:
Originally posted by J-Me
Only 2mph out
Megane Coupe on 17s
Quite suprised as L33LEG thought it would be +10(ish) and I thought it would read faster than you were.
Anyway **mph past a "Safety" camera. Am i to expect an SP30?
Dont normally speed as such but was late for college and traffic was moving faster than normal.
[Edited on 17-05-2005 by J-Me]
i said 8mph 
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Richie
Member
Registered: 3rd Dec 02
Location: Newport, Wales
User status: Offline
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I meant 20cm, not 2cm.
Ordinance survey staff use Carrier Phase recievers, he had to phone through to the office several times to get references.
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