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Re: Speedo error
Miscellaneous UK car topics Other UK car topics (uk.rec.cars.misc)
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#1
 
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Re: Speedo error -
08-16-2003
, 03:08 PM
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It's good to know this stuff, because assuming the pigs always use the 10%+2 mph rule on speed traps, this equates to 35mph in a 30 limit. Add the speedo error of 4mph, then I can do up to 39mph without getting done (only in an innapropriate speed limit, not in a genuinely hazardous environment of course |
"weren't exceeding the limit" when they get pulled for 37 in a 30, but as
you can see, their speedo will be pointing _well_ past 40, hardly a
"slight oversight".
FWIW, I know my speedo over-reads by 7-8%, so I know that if I keep it to
under 35 in a 30, I should be OK.
Pete.
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#2
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It's good to know this stuff, because assuming the pigs always use the 10%+2 mph rule on speed traps, this equates to 35mph in a 30 limit. Add the speedo error of 4mph, then I can do up to 39mph without getting done (only in an innapropriate speed limit, not in a genuinely hazardous environment of course!). Similarly 70mph+10%+2 = 79mph. Add 6mph speedo error and I can do a maximum of 85mph indicated without trouble. In the interest of fuel economy, I normally adhere to an indicated 70mph though. |
take it into account.
This is probably one of the contributory factors in my recent speeding
ticket.
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Steve H
http://www.italiancar.co.uk - Honda VFR800
VW Golf GL Cabrio - Alfa 75 TS - Alfa 33 16v (dead) - Alfa 33 1.7ie
BoTAFOT #87 - BoTAFOF #18 - MRO # - UKRMSBC #7 - Apostle #2 - YTC #
#3
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I bought a GPS reciever ready for when I got lost during my trip to africa. I was playing about with it today to figure out how to operate it, and found it could measure speed. With my old dear driving the escort, I found that 35 mph on the speedo equates to 31 on the GPS, 45 equates to 40 on GPS and 70 equates to 64 on the GPS. The front tyres are barely worn, so I guess it'll even further out of calibration by the time they are due for replacement. Another 3% perhaps? |
indicates about 10% faster than an eMap gps.
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Mike @ www.lefkada-homes.com
#4
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I bought a GPS reciever ready for when I got lost during my trip to africa. I was playing about with it today to figure out how to operate it, and found it could measure speed. With my old dear driving the escort, I found that 35 mph on the speedo equates to 31 on the GPS, 45 equates to 40 on GPS and 70 equates to 64 on the GPS. The front tyres are barely worn, so I guess it'll even further out of calibration by the time they are due for replacement. Another 3% perhaps? My lorry was 0.5 kph out at 90 kph but only because the tyres are part |
That means that when we say lorries do 56, they do do 56 and not the 65
peolpes speedos show.
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________________________
Conor Turton
conor_turton (AT) hotmail (DOT) com
ICQ:31909763
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#5
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This is probably one of the contributory factors in my recent speeding ticket. |
http://italiancar.no-ip.org/~steveh/...s/Image12.html
http://italiancar.no-ip.org/~steveh/...s/Image13.html
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________________________
Conor Turton
conor_turton (AT) hotmail (DOT) com
ICQ:31909763
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#6
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In article <1fzsy2v.1wqge8vi7bp7N%steve (AT) italiancar (DOT) co.uk>, steve (AT) italiancar (DOT) co.uk says... This is probably one of the contributory factors in my recent speeding ticket. More like this was: http://italiancar.no-ip.org/~steveh/...s/Image12.html http://italiancar.no-ip.org/~steveh/...s/Image13.html |
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Pete
#7
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I bought a GPS reciever ready for when I got lost during my trip to africa. I was playing about with it today to figure out how to operate it, and found it could measure speed. With my old dear driving the escort, I found that 35 mph on the speedo equates to 31 on the GPS, 45 equates to 40 on GPS and 70 equates to 64 on the GPS. The front tyres are barely worn, so I guess it'll even further out of calibration by the time they are due for replacement. Another 3% perhaps? I'm going to try it in the cav next, because that feels a lot slower than what the speedo claims. I reckon that when the speedo claims 70, it's only doing 60ish. It's good to know this stuff, because assuming the pigs always use the 10%+2 mph rule on speed traps, this equates to 35mph in a 30 limit. Add the speedo error of 4mph, then I can do up to 39mph without getting done (only in an innapropriate speed limit, not in a genuinely hazardous environment of course!). Similarly 70mph+10%+2 = 79mph. Add 6mph speedo error and I can do a maximum of 85mph indicated without trouble. In the interest of fuel economy, I normally adhere to an indicated 70mph though. It's even got a backlight so I can see it whilst driving in the dark ;-) No doubt someone will aim the flame thrower at me for suggesting that I might exceed the speed limit.... Just out of interest do they ALL do this or would I need a specific type?? |
TIA
Mark (new to the thoughts of GPS... so would love recommendations and
prices of what peeps have and what "special" features they have and whether
they think them good or not. tia again)
#8
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Just out of interest do they ALL do this or would I need a specific type?? (speed Measuring) |
(but only to 110mph)
#9
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In article <bhluld$r0u5$1 (AT) ID-151362 (DOT) news.uni-berlin.de>, itsonlymee (AT) talk21 (DOT) com says... I bought a GPS reciever ready for when I got lost during my trip to africa. I was playing about with it today to figure out how to operate it, and found it could measure speed. With my old dear driving the escort, I found that 35 mph on the speedo equates to 31 on the GPS, 45 equates to 40 on GPS and 70 equates to 64 on the GPS. The front tyres are barely worn, so I guess it'll even further out of calibration by the time they are due for replacement. Another 3% perhaps? My lorry was 0.5 kph out at 90 kph but only because the tyres are part worn. That means that when we say lorries do 56, they do do 56 and not the 65 peolpes speedos show. |
only 56mph, not 60-65 as indicated by the various cars I drive. One was only
doing 54, must have had very worn tyres :-)
Police officer: So why did you crash into the back of this lorry?
Me: I was just checking his speed on the GPS, and didn't see him brake, guv!
The Dervboy
#10
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In article <1fztrqk.bawxe2icmlw1N%steve (AT) italiancar (DOT) co.uk>, steve (AT) italiancar (DOT) co.uk says... I'm not even going to bother with the explanation this time, you've already made twat of yourself in 2 other groups by posting this. You didn't exactly say what a stupid act it was. |
)The Dervboy
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