[DeTomaso] Speedometer

Julian Kift julian_kift at hotmail.com
Mon Aug 3 11:48:18 EDT 2020 

If you have owned the car from new it's unlikely the angle drive has been changed. What rear wheel tire combination are you running?

There are speedometers shops that can recalibrate your speedometer, also GPS units with a mechanical drive to eliminate the gearbox drive. but easiest would probably be to get an in-line mechanical gear driven ratio adapter, available in a wide range of ratios.

Julian
________________________________
From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of Thomas Tornblom <thomas at hax.se>
Sent: Monday, August 3, 2020 5:49 AM
To: Jim Kosloskey <jim.kosloskey at jim-kosloskey.com>
Cc: 'List DeTomaso Forum' <detomaso at server.detomasolist.com>
Subject: Re: [DeTomaso] Speedometer

Check the stamped number on the drive.

There are four types of drives, two each of VDO and Borletti, 1210 revs
per mile and 1610 revs per mile.

Checking the parts catalog it seems there are really three types of
speedos, one KPH using the 1210 drive and both KPH and MPH speedos using
the 1610 drive.

The VDO drives have the ratio stamped on the end of the drive and
Borletti 50-0804 is 1610 and 50-0806 is 1210 revs per mile.

Thomas

Den 2020-08-03 kl. 14:04, skrev Jim Kosloskey:
> Thomas,
>
> I have not done that. How does one verify which one has?
>
> I bought this car new in 1974 in the US. The speedo read properly then. I had it resto/modded in 2015. The ZF was rebuilt but I don't know that the rebuilder changed that drive or why he would have. But it is best to be safe.
>
> Thanks for the insight,
>
> Jim Kosloskey
>
> -----Original Message-----
> From: Thomas Törnblom [mailto:thomas at hax.se]
> Sent: Sunday, August 02, 2020 4:54 PM
> To: Jim Kosloskey <jim.kosloskey at jim-kosloskey.com>
> Cc: List DeTomaso Forum <detomaso at server.detomasolist.com>
> Subject: Re: [DeTomaso] Speedometer
>
> Have you verified that you have the correct angle drive? A kph drive with an mph speedo will show around 42 mph when it should show around 56.
>
> Thomas
>
>> 2 aug. 2020 kl. 20:06 skrev Jim Kosloskey <jim.kosloskey at jim-kosloskey.com>:
>>
>>    All,
>>
>>
>>    My Speedometer was gyrating. A new cable fixed that but now it reads
>>    incorrectly (42-45 mph when really doing around 55 mph).
>>
>>
>>    When I had it restored, 17 inch wheels with Michelin tires were
>>    applied. I suspect the rolling circumference has changed which is what
>>    is affecting the speedo reading.
>>
>>
>>    My question: is there a source for different speedometer gears so I can
>>    get the speedo back in line?
>>
>>
>>    Thanks,
>>
>>
>>    Jim Kosloskey
>>
>>
>>
>> _______________________________________________
>>
>>
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>>
>> !DSPAM:5f270099197341867929216!
>
>
>
>
> !DSPAM:5f27fd7b241781426928224!
>


--
Real life:   Thomas Törnblom             Email:    thomas at hax.se
Snail mail:  Banvallsvägen 14            Phone:    +46 18 32 31 18
              S - 754 40 Uppsala, Sweden  Mobile:   +46 76 209 8320
_______________________________________________


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-------------- next part --------------
   If you have owned the car from new it's unlikely the angle drive has
   been changed. What rear wheel tire combination are you running?

   There are speedometers shops that can recalibrate your speedometer,
   also GPS units with a mechanical drive to eliminate the gearbox drive.
   but easiest would probably be to get an in-line mechanical gear driven
   ratio adapter, available in a wide range of ratios.

   Julian
     __________________________________________________________________

   From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of
   Thomas Tornblom <thomas at hax.se>
   Sent: Monday, August 3, 2020 5:49 AM
   To: Jim Kosloskey <jim.kosloskey at jim-kosloskey.com>
   Cc: 'List DeTomaso Forum' <detomaso at server.detomasolist.com>
   Subject: Re: [DeTomaso] Speedometer

   Check the stamped number on the drive.
   There are four types of drives, two each of VDO and Borletti, 1210 revs
   per mile and 1610 revs per mile.
   Checking the parts catalog it seems there are really three types of
   speedos, one KPH using the 1210 drive and both KPH and MPH speedos
   using
   the 1610 drive.
   The VDO drives have the ratio stamped on the end of the drive and
   Borletti 50-0804 is 1610 and 50-0806 is 1210 revs per mile.
   Thomas
   Den 2020-08-03 kl. 14:04, skrev Jim Kosloskey:
   > Thomas,
   >
   > I have not done that. How does one verify which one has?
   >
   > I bought this car new in 1974 in the US. The speedo read properly
   then. I had it resto/modded in 2015. The ZF was rebuilt but I don't
   know that the rebuilder changed that drive or why he would have. But it
   is best to be safe.
   >
   > Thanks for the insight,
   >
   > Jim Kosloskey
   >
   > -----Original Message-----
   > From: Thomas Toernblom [[1]mailto:thomas at hax.se]
   > Sent: Sunday, August 02, 2020 4:54 PM
   > To: Jim Kosloskey <jim.kosloskey at jim-kosloskey.com>
   > Cc: List DeTomaso Forum <detomaso at server.detomasolist.com>
   > Subject: Re: [DeTomaso] Speedometer
   >
   > Have you verified that you have the correct angle drive? A kph drive
   with an mph speedo will show around 42 mph when it should show around
   56.
   >
   > Thomas
   >
   >> 2 aug. 2020 kl. 20:06 skrev Jim Kosloskey
   <jim.kosloskey at jim-kosloskey.com>:
   >>
   >>    All,
   >>
   >>
   >>    My Speedometer was gyrating. A new cable fixed that but now it
   reads
   >>    incorrectly (42-45 mph when really doing around 55 mph).
   >>
   >>
   >>    When I had it restored, 17 inch wheels with Michelin tires were
   >>    applied. I suspect the rolling circumference has changed which is
   what
   >>    is affecting the speedo reading.
   >>
   >>
   >>    My question: is there a source for different speedometer gears so
   I can
   >>    get the speedo back in line?
   >>
   >>
   >>    Thanks,
   >>
   >>
   >>    Jim Kosloskey
   >>
   >>
   >>
   >> _______________________________________________
   >>
   >>
   >> Detomaso Email List is not managed by POCA Posted emails must not
   >> exceed 1.5 Megabytes DeTomaso mailing list
   >> DeTomaso at server.detomasolist.com
   >> [2]http://server.detomasolist.com/mailman/listinfo/detomaso
   >>
   >> To manage your subscription (change email address, unsubscribe,
   etc.) use the links above.
   >>
   >> Members who post to this list grant license to the list to forward
   any message posted here to all past, current, or future members of the
   list. They also grant the list owner permission to maintain an archive
   or approve the archiving of list messages.
   >>
   >> !DSPAM:5f270099197341867929216!
   >
   >
   >
   >
   > !DSPAM:5f27fd7b241781426928224!
   >
   --
   Real life:   Thomas Toernblom             Email:    thomas at hax.se
   Snail mail:  Banvallsvaegen 14            Phone:    +46 18 32 31 18
                 S - 754 40 Uppsala, Sweden  Mobile:   +46 76 209 8320
   _______________________________________________
   Detomaso Email List is not managed by POCA
   Posted emails must not exceed 1.5 Megabytes
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   DeTomaso at server.detomasolist.com
   [3]http://server.detomasolist.com/mailman/listinfo/detomaso
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References

   1. mailto:thomas at hax.se
   2. http://server.detomasolist.com/mailman/listinfo/detomaso
   3. http://server.detomasolist.com/mailman/listinfo/detomaso

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