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Next: Peugeot 806 remote key fob not working.
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External
Since: Jan 09, 2008
Posts: 2
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(Msg. 1) Posted: Wed Jan 09, 2008 2:42 am
Post subject: 88 325 speedo is slow,..
Archived from groups: alt>autos>bmw (more info?)
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| I used to a HTO but now I drive legally. Since I bought this used car
I've noticed more people are tailgating me. Today I passed one of
those speed contol things the cops park by the side of the road. It
says, "your speed is 33mph but my speedo said 40. Is there a way to
fix this? Thanks again.
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>> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: Jun 22, 2004
Posts: 986
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(Msg. 2) Posted: Wed Jan 09, 2008 10:55 am
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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In article ,
cosmo wrote:
> I used to a HTO but now I drive legally. Since I bought this used car
> I've noticed more people are tailgating me. Today I passed one of
> those speed contol things the cops park by the side of the road. It
> says, "your speed is 33mph but my speedo said 40. Is there a way to
> fix this? Thanks again.
The likely thing is it's had an incorrect - probably secondhand -
component fitted at some time. Could be many things depending on model
etc. Even major parts like the final drive.
On another make I came across one model where the speedo read very slow.
This model was available with a wide choice of engines - from diesel to
V-8 through four and six cylinder - all of which used basically the same
gearbox where the speedo drive was situated. But no less than four
different rear axle ratios. The gearbox had been changed by a gearbox
'specialist' and the speedo drive was the wrong one for the rear axle. To
change the drive involved stripping the box as the drive gear is obviously
different too.
--
*Out of my mind. Back in five minutes.
Dave Plowman dave.DeleteThis@davenoise.co.uk London SW
To e-mail, change noise into sound. |
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External
Since: Mar 12, 2005
Posts: 394
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(Msg. 3) Posted: Wed Jan 09, 2008 11:00 am
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"cosmo" wrote in message
>I used to a HTO but now I drive legally. Since I bought this used car
> I've noticed more people are tailgating me. Today I passed one of
> those speed contol things the cops park by the side of the road. It
> says, "your speed is 33mph but my speedo said 40. Is there a way to
> fix this? Thanks again.
Fit the correct size wheels and tyres! >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: Sep 19, 2007
Posts: 36
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(Msg. 4) Posted: Wed Jan 09, 2008 5:18 pm
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Wed, 9 Jan 2008 11:00:01 -0000, "R. Mark Clayton"
wrote:
>
>"cosmo" wrote in message
>
>>I used to a HTO but now I drive legally. Since I bought this used car
>> I've noticed more people are tailgating me. Today I passed one of
>> those speed contol things the cops park by the side of the road. It
>> says, "your speed is 33mph but my speedo said 40. Is there a way to
>> fix this? Thanks again.
>
>Fit the correct size wheels and tyres!
~~~~~~~~~~~~~~~~~~~~~~
We have a winner... This is the most likely cause. Chances are, the
tire circumference is considerably smaller than it should be. This
means that the tires are turning faster to go the same speed which
will run the speedometer on the high side. It's also possiblr that the
instrument cluster has been changed and the wrong coding plug is
installed in the new cluster but that is fairly unlikely. Another
option is that the rear has been changed but this is fairly unlikely
as well. >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: Jan 09, 2008
Posts: 2
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(Msg. 5) Posted: Wed Jan 09, 2008 7:12 pm
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Michael Yeager wrote:
> On Wed, 9 Jan 2008 11:00:01 -0000, "R. Mark Clayton"
> wrote:
>
>> "cosmo" wrote in message
>>
>>> I used to a HTO but now I drive legally. Since I bought this used car
>>> I've noticed more people are tailgating me. Today I passed one of
>>> those speed contol things the cops park by the side of the road. It
>>> says, "your speed is 33mph but my speedo said 40. Is there a way to
>>> fix this? Thanks again.
>> Fit the correct size wheels and tyres!
> ~~~~~~~~~~~~~~~~~~~~~~
>
> We have a winner... This is the most likely cause. Chances are, the
> tire circumference is considerably smaller than it should be. This
> means that the tires are turning faster to go the same speed which
> will run the speedometer on the high side. It's also possiblr that the
> instrument cluster has been changed and the wrong coding plug is
> installed in the new cluster but that is fairly unlikely. Another
> option is that the rear has been changed but this is fairly unlikely
> as well.
You would have to make a dramatic change to your tire and wheel size to
make the speedo read well over 15% higher than your actual speed. It's
got to be something else. >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: Nov 07, 2004
Posts: 42
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(Msg. 6) Posted: Wed Jan 09, 2008 7:25 pm
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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> says, "your speed is 33mph but my speedo said 40. Is there a way to
> fix this? Thanks again.
Fit the correct diameter wheels with the original profile tyres. The speedo
is driven from a sensor on top of the diff and the speedo expects pulses
from the hall effect transmitter based on the original rolling
circumference.
Alternatively, just use GPS/Satnav for a more accurate reading.
Al. >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: Aug 24, 2005
Posts: 281
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(Msg. 7) Posted: Wed Jan 09, 2008 9:00 pm
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Dan wrote:
>
>You would have to make a dramatic change to your tire and wheel size to
>make the speedo read well over 15% higher than your actual speed. It's
>got to be something else.
True, but I have seen some pretty dramatic tire changes out there.
It's also possible the differential was swapped out for a different
ratio one.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis." >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: Mar 12, 2005
Posts: 394
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(Msg. 8) Posted: Thu Jan 10, 2008 10:58 pm
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Dan" wrote in message
> Michael Yeager wrote:
>> On Wed, 9 Jan 2008 11:00:01 -0000, "R. Mark Clayton"
>> wrote:
>>
>>> "cosmo" wrote in message
>>>
>>>> I used to a HTO but now I drive legally. Since I bought this used car
>>>> I've noticed more people are tailgating me. Today I passed one of
>>>> those speed contol things the cops park by the side of the road. It
>>>> says, "your speed is 33mph but my speedo said 40. Is there a way to
>>>> fix this? Thanks again.
>>> Fit the correct size wheels and tyres!
>> ~~~~~~~~~~~~~~~~~~~~~~
>>
>> We have a winner... This is the most likely cause. Chances are, the
>> tire circumference is considerably smaller than it should be. This
>> means that the tires are turning faster to go the same speed which
>> will run the speedometer on the high side. It's also possiblr that the
>> instrument cluster has been changed and the wrong coding plug is
>> installed in the new cluster but that is fairly unlikely. Another
>> option is that the rear has been changed but this is fairly unlikely
>> as well.
>
> You would have to make a dramatic change to your tire and wheel size to
> make the speedo read well over 15% higher than your actual speed. It's
> got to be something else.
Well maybe, but typically BMW speedos read ~5% high and we are not talking a
huge difference here. >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: Jan 09, 2008
Posts: 2
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(Msg. 9) Posted: Thu Jan 10, 2008 10:58 pm
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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R. Mark Clayton wrote:
> "Dan" wrote in message
>
>> Michael Yeager wrote:
>>> On Wed, 9 Jan 2008 11:00:01 -0000, "R. Mark Clayton"
>>> wrote:
>>>
>>>> "cosmo" wrote in message
>>>>
>>>>> I used to a HTO but now I drive legally. Since I bought this used car
>>>>> I've noticed more people are tailgating me. Today I passed one of
>>>>> those speed contol things the cops park by the side of the road. It
>>>>> says, "your speed is 33mph but my speedo said 40. Is there a way to
>>>>> fix this? Thanks again.
>>>> Fit the correct size wheels and tyres!
>>> ~~~~~~~~~~~~~~~~~~~~~~
>>>
>>> We have a winner... This is the most likely cause. Chances are, the
>>> tire circumference is considerably smaller than it should be. This
>>> means that the tires are turning faster to go the same speed which
>>> will run the speedometer on the high side. It's also possiblr that the
>>> instrument cluster has been changed and the wrong coding plug is
>>> installed in the new cluster but that is fairly unlikely. Another
>>> option is that the rear has been changed but this is fairly unlikely
>>> as well.
>> You would have to make a dramatic change to your tire and wheel size to
>> make the speedo read well over 15% higher than your actual speed. It's
>> got to be something else.
>
> Well maybe, but typically BMW speedos read ~5% high and we are not talking a
> huge difference here.
>
>
If you have a lease, 15% is a lot. My 45,000 mile, three-year lease
would start costing me $.20 per mile after 38,250 actual miles. So if I
drove 45,000 actual miles I would have to pay $1350 due to the higher
odometer reading. >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: Mar 12, 2005
Posts: 394
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(Msg. 10) Posted: Thu Jan 10, 2008 10:59 pm
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Al" wrote in message
>> says, "your speed is 33mph but my speedo said 40. Is there a way to
>> fix this? Thanks again.
>
> Fit the correct diameter wheels with the original profile tyres. The
> speedo
> is driven from a sensor on top of the diff and the speedo expects pulses
> from the hall effect transmitter based on the original rolling
> circumference.
>
> Alternatively, just use GPS/Satnav for a more accurate reading.
>
> Al.
Or time off the marker posts at the side of a motorway - this is how I found
out that my current 735i reads 405% high only two weeks ago. >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: May 23, 2005
Posts: 239
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(Msg. 11) Posted: Thu Jan 10, 2008 10:59 pm
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"R. Mark Clayton" wrote in message
>
> "Al" wrote in message
>
>>> says, "your speed is 33mph but my speedo said 40. Is there a way to
>>> fix this? Thanks again.
>>
>> Fit the correct diameter wheels with the original profile tyres. The
>> speedo
>> is driven from a sensor on top of the diff and the speedo expects pulses
>> from the hall effect transmitter based on the original rolling
>> circumference.
>>
>> Alternatively, just use GPS/Satnav for a more accurate reading.
>>
>> Al.
>
> Or time off the marker posts at the side of a motorway - this is how I
> found out that my current 735i reads 405% high only two weeks ago.
Wow, that's some error! So when you are going 50 kph, your speedo reads
202.5? What happens when you hit 60 mph/100 kph?
Tom K. >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: Jan 09, 2008
Posts: 2
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(Msg. 12) Posted: Fri Jan 11, 2008 2:18 am
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On 9 Jan 2008 19:25:27 GMT, Al wrote:
>> says, "your speed is 33mph but my speedo said 40. Is there a way to
>> fix this? Thanks again.
>
>Fit the correct diameter wheels with the original profile tyres. The speedo
>is driven from a sensor on top of the diff and the speedo expects pulses
>from the hall effect transmitter based on the original rolling
>circumference.
>
>Alternatively, just use GPS/Satnav for a more accurate reading.
>
>Al.
Wheels are original, tires are correct. The work receipts are
extensive and make no mention of final drive work, which appears to be
original.
I had problems with dash reminder lights and when I went to replace
the dash battery I found it had been replaced already at 60k miles
according to the work records. The rechargeable battery had been
replaced with a lithium battery. I guess the dealer replaces the whole
board assembly at a whopping rate and the replacement is lithium
instead of rechargeable. I just soldered in the same battery as was
there so maybe it's loosing juice already after 4 months. I wonder if
that could give things a false reading. Thanks as always. >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: Mar 12, 2005
Posts: 394
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(Msg. 13) Posted: Fri Jan 11, 2008 1:04 pm
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Tom K." wrote in message
>
> "R. Mark Clayton" wrote in message
>
>>
>> "Al" wrote in message
>>
>>>> says, "your speed is 33mph but my speedo said 40. Is there a way to
>>>> fix this? Thanks again.
>>>
>>> Fit the correct diameter wheels with the original profile tyres. The
>>> speedo
>>> is driven from a sensor on top of the diff and the speedo expects pulses
>>> from the hall effect transmitter based on the original rolling
>>> circumference.
>>>
>>> Alternatively, just use GPS/Satnav for a more accurate reading.
>>>
>>> Al.
>>
>> Or time off the marker posts at the side of a motorway - this is how I
>> found out that my current 735i reads 4-5% high only two weeks ago.
>
> Wow, that's some error! So when you are going 50 kph, your speedo reads
> 202.5? What happens when you hit 60 mph/100 kph?
> Tom K.
>
4 to 5 percent >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: May 23, 2005
Posts: 239
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(Msg. 14) Posted: Fri Jan 11, 2008 5:14 pm
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"R. Mark Clayton" wrote in message
>
> "Tom K." wrote in message
>
>>
>> Wow, that's some error! So when you are going 50 kph, your speedo reads
>> 202.5? What happens when you hit 60 mph/100 kph?
>> Tom K.
>>
>
> 4 to 5 percent
Was trying to figure out the typo but it should have been obvious as "-" is
next to "0". While 4~5% is annoying, it seems to be pretty much normal
these days.
Greatest error I ever saw was a '76 BMW R75 motorcycle which read 125 mph at
it's top speed of about 103. IIRC, Road & Track magazine in the 60's & 70's
normally published the speedo error at 30 and 60 as part of their road
tests, with some of the worst offenders being the Ferraris - as much as 20%
high.
Tom K. >> Stay informed about: 88 325 speedo is slow,.. |
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External
Since: Mar 12, 2005
Posts: 394
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(Msg. 15) Posted: Sat Jan 12, 2008 1:13 pm
Post subject: Re: 88 325 speedo is slow,.. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Tom K." wrote in message
>
> "R. Mark Clayton" wrote in message
>
>>
>> "Tom K." wrote in message
>>
>>>
>>> Wow, that's some error! So when you are going 50 kph, your speedo reads
>>> 202.5? What happens when you hit 60 mph/100 kph?
>>> Tom K.
>>>
>>
>> 4 to 5 percent
>
> Was trying to figure out the typo but it should have been obvious as "-"
> is next to "0". While 4~5% is annoying, it seems to be pretty much normal
> these days.
>
> Greatest error I ever saw was a '76 BMW R75 motorcycle which read 125 mph
> at it's top speed of about 103. IIRC, Road & Track magazine in the 60's &
> 70's normally published the speedo error at 30 and 60 as part of their
> road tests, with some of the worst offenders being the Ferraris - as much
> as 20% high.
>
> Tom K.
>
Could have been 4.5% (actually 4.4%, but the margin of error is about 0.3%.
Legal limit is 10% IIRC, and Fords were the ones most often nearest the
maximum over. >> Stay informed about: 88 325 speedo is slow,.. |
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