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Inaccurate speedometers Accords

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est...@my-deja.com

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Dec 31, 1999, 3:00:00 AM12/31/99
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Discovered accidently (no pun) that my 98 V6 Accord has a speedo that
is off by at least 10%. When it says 70 on the dial I'm doing around
62. Honda just sent me a letter saying that their speedometers are
manufactured to a 10%plus or minus accuracy standard. So they won't
replace since I am within their 10% +/- standard. Anyone else discover
this problem with speedometer readings. Honda says it has been
following the 10% error standard since 1982. Actually the faster one
drives the greater the variance. It is accurate (almost) at 30 mph and
at 75mph it is well over 10%. Can this be fixed? E-mail me and I'll
send you a copy of their letter. Doesn't make sense to me and goes
against Honda's great reputation.


Sent via Deja.com http://www.deja.com/
Before you buy.

est...@my-deja.com

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Dec 31, 1999, 3:00:00 AM12/31/99
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ry

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Dec 31, 1999, 3:00:00 AM12/31/99
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we have an '89 toyota supra with the same situation. my '96 acura integra
is nowhere near as bad as the supra.
you have to get in the habit of using your trip odometer and watching the
clock...

<est...@my-deja.com> wrote in message news:84j94n$vqm$1...@nnrp1.deja.com...

Saintor

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Dec 31, 1999, 3:00:00 AM12/31/99
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It is true on mine, too.

Probably not 10%. My wife was following me and we use to cruise at 118km/h
(ah! cops!) She passed me and she told me later that I was significantly
slower than what I was thinking.

In another situation, the local cops leave a stationary radar with display.
While I was at 30 km/h, the display was 28.

Peter Doherty

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Jan 1, 2000, 3:00:00 AM1/1/00
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The 91 civic wagon I drove read 60 when you were going about 55....my
current 94 hatchback is much more accurate. But don't forget that things
like tire size can effect the speedo....


<est...@my-deja.com> wrote in message news:84j8td$vhb$1...@nnrp1.deja.com...

gmccx

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Jan 1, 2000, 3:00:00 AM1/1/00
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This was just recently discussed in a small email Honda list group, and
it
appears that possibly *no* Honda has ever been made with a speedometer
that was any more accurate than this. As far as I know, the Feds only
require that +-10% mentioned in an earlier note, and they are within
that
rule...but I'm afraid i just can't imagine that a company as large as
Honda
can't come up with enough technology to make their stupid speedos read
right.
I've personally had the same problem with two different Hondas I've
owned
recently, and I do think that this sort of sloppy engineering work
could
well have some effect on my buying decisions next time.

--

Have (a) nice day(s)...

George

conANDave

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Jan 1, 2000, 3:00:00 AM1/1/00
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<est...@my-deja.com> wrote in message news:84j8td$vhb$1...@nnrp1.deja.com...
: Discovered accidently (no pun) that my 98 V6 Accord has a speedo that
: is off by at least 10%. When it says 70 on the dial I'm doing around
: 62. Honda just sent me a letter saying that their speedometers are
: manufactured to a 10%plus or minus accuracy standard. So they won't
: replace since I am within their 10% +/- standard. Anyone else discover
: this problem with speedometer readings. Honda says it has been
: following the 10% error standard since 1982. Actually the faster one
: drives the greater the variance. It is accurate (almost) at 30 mph and
: at 75mph it is well over 10%. Can this be fixed? E-mail me and I'll
: send you a copy of their letter. Doesn't make sense to me and goes
: against Honda's great reputation.

I remember reading once that a lot of automakers do this, with the error in
their speedometers, always greater (in this case 10% greater than actual
speed) to protect themselves from lawsuits. The reasoning was that if they
made speedometers that were exact, undoubtably there would be some that
would be inaccurate by minor percentages anyway. If the speedometer read a
speed that was less than actual speed, and the vehicle owner was driving by
what he believed was less than or equal to the actual speed limit but, in
reality, was driving above the speed limit, and as a result, was pulled over
due to this error, than automakers, like Honda, would be opening an
automotive Pandora's Box for themselves.

I don't know if this is actually the case, but this is the reason I was told
why and it sounds logical enough to me.

na

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Jan 2, 2000, 3:00:00 AM1/2/00
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When I worked for ford the ten percent thing was the same there too,
although I have never seen one that fucked up.
conANDave wrote in message ...

sti...@cat.box

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Jan 2, 2000, 3:00:00 AM1/2/00
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My 2k Ody is about 3mph fast @ 30, and 5 @ 75.
I verified that with a radar speed check unit and GPS.
My Caravan was about 3mph fast also.
Mfgs justify it by saying it keeps you from speeding. If it was slow
you probably could get them to do something. I say bullshit. I want it
accurate. So now I just add 5mph and drive 10mph over the limit
instead of 5.

Rberq

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Jan 2, 2000, 3:00:00 AM1/2/00
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My 87 Civic consistently reads 5 MPH faster than I am actually going,
regardless whether it is 25 or 75.

Robert Snow

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Jan 2, 2000, 3:00:00 AM1/2/00
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I replaced the awful Michelin MXV4 "green" 195/60 15 tires on my Accord with
205/60 15 Dunlop D60A2 tires. Got rid of my speedometer error and improved
handling considerably. Manufacturers always er on the "safe" side. That's
why there are nearly two gallons left in the tank when the gas gauge reads
empty!

L. Lenox

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Jan 2, 2000, 3:00:00 AM1/2/00
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Don't forget that your fuel consumption is 5-10% worse than calculated
using your odometer. For example 30 mpg calculated is only 27 to 28 mpg.
manufacturers prefer it this way.

My 83 Civic has between 5 and 7% error depending on tire wear.

est...@my-deja.com wrote in message <84j8td$vhb$1...@nnrp1.deja.com>...


>Discovered accidently (no pun) that my 98 V6 Accord has a speedo that
>is off by at least 10%. When it says 70 on the dial I'm doing around
>62. Honda just sent me a letter saying that their speedometers are
>manufactured to a 10%plus or minus accuracy standard. So they won't
>replace since I am within their 10% +/- standard. Anyone else discover
>this problem with speedometer readings. Honda says it has been
>following the 10% error standard since 1982. Actually the faster one
>drives the greater the variance. It is accurate (almost) at 30 mph and
>at 75mph it is well over 10%. Can this be fixed? E-mail me and I'll
>send you a copy of their letter. Doesn't make sense to me and goes
>against Honda's great reputation.
>
>

na

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Jan 3, 2000, 3:00:00 AM1/3/00
to
I read another post where someone said something about using GPS to
determine speed more correctly than timing and mile markers. I was using my
GPS today (didn't really have enough time to average it out) and it seems
when pegging sixty my real speed is right about 57 to 58 mph. 1996
accord ex with stock 195/60/15 tires/ wheels. I will be doing some more
testing on this later when people get the hell out of my way on the freeway
so I can put on my cruise control
Robert Snow wrote in message ...

Victor Grubsky

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Jan 3, 2000, 3:00:00 AM1/3/00
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Robert Snow wrote:

> handling considerably. Manufacturers always er on the "safe" side. That's
> why there are nearly two gallons left in the tank when the gas gauge reads
> empty!

Correction: that's 3 gallons in the new Accord.

Victor Grubsky

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Jan 3, 2000, 3:00:00 AM1/3/00
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ry wrote:

> we have an '89 toyota supra with the same situation. my '96 acura integra
> is nowhere near as bad as the supra.
> you have to get in the habit of using your trip odometer and watching the
> clock...
>

Some data for my 2000 LX V6 coupe that I measured yesterday on a freeway with
the cruise control at 70 mph. I made two runs in opposite directions on the
same freeway.

Run #1: 5.0 miles - 4:34
Run #2: 5.0 miles - 4:34

Pretty consistent, as you can see. The actual speed (assuming the odometer is
correct) is 65.7 mph.


Victor


Don Enderton

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Jan 3, 2000, 3:00:00 AM1/3/00
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No, speedometer error does not automatically mean odometer error. You are
incorrect, based on my own experience with several vehicles. I usually find
the odometer is much more accurate than the speedometer (have tested both).

-- Don

Peter Doherty

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Jan 4, 2000, 3:00:00 AM1/4/00
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I disagree. I believe they both work from the same sensor, and generally
are inaccurate together. I know that a trip from home to work was ALWAYS
15.7 miles in my old Honda, and I knew the speed was a little off...my new
car reads that trip as 16.0 miles...

so you're saying that your odometer is accurate to the mile markers on the
highway, but the speedo is off?? that seems quite odd...


"Don Enderton" <Ende...@NoSpam.org> wrote in message
news:38717F76...@NoSpam.org...

Lee C

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Jan 4, 2000, 3:00:00 AM1/4/00
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Peter Doherty wrote:
>
> I disagree. I believe they both work from the same sensor, and generally
> are inaccurate together. I know that a trip from home to work was ALWAYS
> 15.7 miles in my old Honda, and I knew the speed was a little off...my new
> car reads that trip as 16.0 miles...
>
> so you're saying that your odometer is accurate to the mile markers on the
> highway, but the speedo is off?? that seems quite odd...

Stretches of I95 in Virginia has 1/10 mile markers. I had to drive
my car for 20 miles before it was completely off by one 1/10 mile
marker. So my odometer is accurage to .5% by my casual observation.

I'll do some speed runs to see what happens. I have a feeling that
my speedometer is fast by about 5mph.

--
Lee Cao - www.leecao.com

Alex Ciurczak

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Jan 4, 2000, 3:00:00 AM1/4/00
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On my last car (Integra GS-R) they were most definitely not from the
same sensor. I took the car in to the dealer because the darn
speedometer was 5 mph fast at 70 mph. (timed with mile markers back
East). It was a lease and I was concerned about the mileage being that
much off as well. Dealer gave me a xerox of a Honda tech bulletin,
stating that if the speedometers were within 10%, it was operating
within specs, and also said that the odometer had nothing to do with
the speedometer. Annoyed, I went out and tested the odometer with the
same mile markers, and it turned out to read about 1% below actual, so
I didn't worry about it anymore.

-Alex
98 Prelude SH
99 TL

--
_______________________________
alex ciurczak
al...@ciurczak.nospamhere.com
(remove nospamhere for replies)
http://www.ciurczak.com
_______________________________

Derek U.

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Jan 4, 2000, 3:00:00 AM1/4/00
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And you trust mile markers? Some joe-bob in his truck driving 1 mile according
to his odometer --- the smacking the stake in the ground? Hardly precise.

Lee C

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Jan 4, 2000, 3:00:00 AM1/4/00
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"Derek U." wrote:
>
> And you trust mile markers? Some joe-bob in his truck driving 1 mile according
> to his odometer --- the smacking the stake in the ground? Hardly precise.

I doubt they can do that. Because accumulated error would have
been disasterous.

Derek U.

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Jan 4, 2000, 3:00:00 AM1/4/00
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Lee C wrote:

they certainly dont get out there with one of those little walking rulers to
trot off 1 mile.


Don Enderton

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Jan 5, 2000, 3:00:00 AM1/5/00
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They can both work off the same sensor, but differ in accuracy. That is not odd
at all, if you are an engineer. The odometer is measuring distance; the
speedometer is indicating (approximate) speed. They can use the same source
data, but in different ways.

Peter Doherty wrote:

> I disagree. I believe they both work from the same sensor, and generally
> are inaccurate together. I know that a trip from home to work was ALWAYS
> 15.7 miles in my old Honda, and I knew the speed was a little off...my new
> car reads that trip as 16.0 miles...
>
> so you're saying that your odometer is accurate to the mile markers on the
> highway, but the speedo is off?? that seems quite odd...
>

Don Enderton

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Jan 5, 2000, 3:00:00 AM1/5/00
to
That's not how mile markers in California are placed. What state do you live in,
and how do you know how this is done?

"Derek U." wrote:

> And you trust mile markers? Some joe-bob in his truck driving 1 mile according
> to his odometer --- the smacking the stake in the ground? Hardly precise.
>

> Alex Ciurczak wrote:
>
> > On my last car (Integra GS-R) they were most definitely not from the
> > same sensor. I took the car in to the dealer because the darn
> > speedometer was 5 mph fast at 70 mph. (timed with mile markers back
> > East). It was a lease and I was concerned about the mileage being that
> > much off as well. Dealer gave me a xerox of a Honda tech bulletin,
> > stating that if the speedometers were within 10%, it was operating
> > within specs, and also said that the odometer had nothing to do with
> > the speedometer. Annoyed, I went out and tested the odometer with the
> > same mile markers, and it turned out to read about 1% below actual, so
> > I didn't worry about it anymore.
> >
> > -Alex
> > 98 Prelude SH
> > 99 TL
> >
> > In article <38720EE3...@leecao.com>, Lee C <l...@leecao.com> wrote:
> >

> > > Peter Doherty wrote:
> > > >
> > > > I disagree. I believe they both work from the same sensor, and generally
> > > > are inaccurate together. I know that a trip from home to work was ALWAYS
> > > > 15.7 miles in my old Honda, and I knew the speed was a little off...my new
> > > > car reads that trip as 16.0 miles...
> > > >
> > > > so you're saying that your odometer is accurate to the mile markers on the
> > > > highway, but the speedo is off?? that seems quite odd...
> > >

> > > Stretches of I95 in Virginia has 1/10 mile markers. I had to drive
> > > my car for 20 miles before it was completely off by one 1/10 mile
> > > marker. So my odometer is accurage to .5% by my casual observation.
> > >
> > > I'll do some speed runs to see what happens. I have a feeling that
> > > my speedometer is fast by about 5mph.
> > >

> > > --
> > > Lee Cao - www.leecao.com
> >

aciu...@my-deja.com

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Jan 6, 2000, 3:00:00 AM1/6/00
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The right way to do it is to count 5 or more mile
markers and divide. And do it multiple times over
a number of different highways. In my case, they
always came out spot on. I'd put more faith in
them then you think...

-Alex

In article <38724F05...@beast.amd.com>,
"Derek U." <der...@beast.amd.com> wrote:


> Lee C wrote:
>
> > "Derek U." wrote:
> > >
> > > And you trust mile markers? Some joe-bob in
his truck driving 1 mile according
> > > to his odometer --- the smacking the stake
in the ground? Hardly precise.
> >

> > I doubt they can do that. Because accumulated
error would have
> > been disasterous.
> >

> > --
> > Lee Cao - www.leecao.com
>

> they certainly dont get out there with one of
those little walking rulers to
> trot off 1 mile.
>
>

Sent via Deja.com http://www.deja.com/
Before you buy.

aciu...@my-deja.com

unread,
Jan 6, 2000, 3:00:00 AM1/6/00
to
The right way to do it is to count 5 or more mile
markers and divide. And do it multiple times over
a number of different highways. In my case, they
always came out spot on. I'd put more faith in
them then you think...

-Alex


98 Prelude SH
99 TL

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