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Today's topics:
* Speedometer error - 2 messages, 2 authors
http://groups.google.com/group/rec.autos.makers.honda/t/dd0e0cb203486443?hl=en
* Garmin nüvi 255W 4.3-Inch Widescreen Portable GPS Navigator 52% Discount - 1
messages, 1 author
http://groups.google.com/group/rec.autos.makers.honda/t/14057de69cbf2e80?hl=en
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TOPIC: Speedometer error
http://groups.google.com/group/rec.autos.makers.honda/t/dd0e0cb203486443?hl=en
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== 1 of 2 ==
Date: Thurs, Nov 19 2009 6:45 pm
From: "Charles"
Nasty wrote:
> I'd have to go to 225/65 to compensate with tires.
> Isn't there a gear I could replace or are they electronic?
Typically, they are electronic although you should confirm that with the
service manual. Honda is not likely to provide you with the schematic for
the speedometer, so you'll have to pull it out and reverse-engineer it. If
you have lived a pure and wholesome life, you'll find a set of switches or
jumpers in there clearly marked with the divider values. Often the design
engineers build in some adjustability for the various tire sizes likely to
be delivered with the vehicle.
On another point, as Joe Sixpack points out, your readings are off more than
the usual amount of a few miles per hour. Is that normal for that model? If
possible, find another vehicle identical to yours and determine whether
_that_ vehicle is off as much. I suspect that yours has another problem.
Usually there are magnets on the drive shaft that pass a reed switch. As the
drive shaft turns, a series of electrical pulses is sent to the speedometer
which counts them and converts that number into miles per hour. Perhaps one
of the magnets is missing or not quite in the right position. Perhaps the
switch or sensor is askew. Maybe there is a defect in the speedometer so
that it is missing some of the incoming pulses.
It wouldn't hurt to confirm the speedometer reading with a measured mile. I
went so far as to borrow a police radar gun to verify my speedometer. If the
GPS, the stopwatch and the radar agree, look at the pulse circuitry.
--
Chuck
== 2 of 2 ==
Date: Sat, Nov 21 2009 9:48 pm
From: Dillon Pyron
Thus spake Tegger <invalid@invalid.inv> :
>Nasty <nasty@tampabay.rr.com> wrote in news:4b01c85e$0$4857
>$9a6e19ea@unlimited.newshosting.com:
>
>> My 2000 Accord speedometer is off by about 8 mph according to my gps.
>> It's kind of a good thing, it'll read 70 but I'm actually doing about
>> 62. Is there a fix for this?
>>
>> TIA
>
>
>
>
>GPS's are not definitively accurate. There is a fairly large built-in error
>in all GPS's. GPS satellites are the property of the US Department of
>Defense, and the military doesn't want you having the same thing they've
>got for reasons of national security. This is outlined in all the new-car
>PDI docs issued by Honda for vehicles that have NAVI.
Way incorrect. SA/CA went out long ago. During Desert Storm they had
to disable it because the DoD couldn't get enough MilSpec GPS units
and was buying civilian units from Magellan.
Hell, my iPhone regularly puts me not only at the right address, but
at the right location in my house. I can observe it track me from the
back door to the front door.
If the FAA is happy with GPS, so am I. And with the added accuracy of
WAAS, cat 3C landings are possible at some airports.
>
>In addition to that, speedometers are designed to be "fast" on account of
>liability laws. Add the two together, and it could well be 8mph at 62 or
>70.
Are you sure? I've been told that's a myth. I've had three different
GPS units agree to within about 1 mph on my speedo, along with two
different radar guns hitting me at the same time (voluntarilly). For
clarity, one gun was used in conjunction with one test, another with
anohter.
>
>If you really want to know your car's speedo/odo accuracy, you need to
>spend some time with a piece of chalk and a long tape measure.
Even better, get a metering wheel (fifth wheel).
--
- dillon I am not invalid
"Get a shot off fast. This upsets him long enough to
let you make your second shot perfect."
-- Lazurus Long
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TOPIC: Garmin nüvi 255W 4.3-Inch Widescreen Portable GPS Navigator 52%
Discount
http://groups.google.com/group/rec.autos.makers.honda/t/14057de69cbf2e80?hl=en
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== 1 of 1 ==
Date: Sat, Nov 21 2009 1:42 am
From: jolly
Garmin nüvi 255W 4.3-Inch Widescreen Portable GPS Navigator 52%
Discount
http://www.techespot.com/2009/11/garmin-nuvi-255w-43-inch-widescreen.html
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