Home » Public Forums » GMCnet » Speedo and odometer way of
| Speedo and odometer way of [message #276114] |
Sat, 18 April 2015 01:58  |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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Just wondering
My speedo odemeter is about 12% off compared with tomtom. I believe tomtom to be right. Also compared with the milage. Just wondering why it can be so much off. That is showing less mph. It is the original with a new cable, butnow without powersteering. Manny trans rebuild in theNetherlands.
Otherwise I found a limit to Olga s abilitys. We wanted to visit a castle at Lindoso, northern Portugal. A rainy day, a not so steep incline and wet cobblestones. New Micheline summer tires. Just spinning, leaving rubber on the cobbles, bad smell
Going to Paris, France tomorrow, seeing the. http://albert-kahn.hauts-de-seine.net/venir-au-musee/informations-pratiques/http://albert-kahn.hauts-de-seine.net/venir-au-musee/informations-pratiques/
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: Speedo and odometer way of [message #276115 is a reply to message #276114] |
Sat, 18 April 2015 02:09  |
Gadabout
Messages: 124
Registered: March 2013
Location: Edmonton
Karma: 2
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Tire size and gear ratio will affect the speedo.
12% sounds like the gear ratio may have been changed.
There are adapters that will correct the accuracy.
Here us a link for tire size conversion:
http://gmcmotorhome.info/tires.html
Carl Harr : Driver NASCAR Pro Series #2
1978 Gadabout-Restoring
1978 Palm Beach
1976 Glenbrook
Prevost Featherlite H3-45
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| Re: [GMCnet] Speedo and odometer way of [message #276116 is a reply to message #276114] |
Sat, 18 April 2015 02:11 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Not helpful, but I found the speedometer on my GMC to be off as well, by
around 4-5mph.
Luckily, we did not experience any cobblestone while touring
VA,NC,MA,PA,WV :D
--
Best regards
Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA
'76a Eleganza II, VA
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: Speedo and odometer way of [message #276117 is a reply to message #276114] |
Sat, 18 April 2015 04:07 |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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Thanks for the replys. Forgpt to write tiresize 225x75x16. Alcoas
Was wondering about the fd. But seems to be the original 3.07?
Peer good you did not meet the cobblestones, but then you are meeting all these interesting people. Wish I could have same pf these to do my steering.
Happy trails
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: Speedo and odometer way of [message #276136 is a reply to message #276114] |
Sat, 18 April 2015 11:24 |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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They both are 12% LOWER then TomTom. Like 50 mh is 56 on Tom. Same with the odometer. 100 miles will be 112 on The dashboard app
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] Speedo and odometer way of [message #276150 is a reply to message #276116] |
Sat, 18 April 2015 16:27 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Peer Oliver Schmidt wrote on Sat, 18 April 2015 00:11Not helpful, but I found the speedometer on my GMC to be off as well, by
around 4-5mph.
Luckily, we did not experience any cobblestone while touring
VA,NC,MA,PA,WV 
--
Best regards
Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA
'76a Eleganza II, VA
I found the same as Peer. Mine is off about 3 with the original 3.07 final drive. Perhaps it is tires, although I got the size (16") that the experts assured us were the same diameter. For a short time I had a 3.55 final drive with the converter. Still off. Then I had a 2.73 for a shorter time. Bought a converter... Still off. Now I have a 3.21 with the special 3.21 metal gear and yup... still off.
TomTom says the speed is off and mileage is off. Mile markers say mileage is off. I think maybe it is off.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] Speedo and odometer way of [message #276155 is a reply to message #276153] |
Sat, 18 April 2015 17:48 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Am 19.04.2015 um 00:36 schrieb Robert Mueller:
> G'day,
>
> I think the question should be; "What is the manufacturing tolerance for a GMC speedometer?"
>
> If your speedo is off by 5 mph at highway speeds it is highly unlikely that you will ever get a speeding ticket.
>
The problem could be, that it is off the wrong way. ie. I drive faster
than it shows. And *if* I were like the average driver I come to notice
in the US, I would be able to plaster the whole interior of my GMC with
speeding tickets :*)
--
Best regards
Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA
'76a Eleganza II, VA
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: Speedo and odometer way of [message #276156 is a reply to message #276114] |
Sat, 18 April 2015 17:57 |
dmumert
Messages: 46
Registered: December 2006
Location: Canada
Karma: 0
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If you have 2.73 gears installed instead of the standard 3.07 your speedometer will be reading 50 mph when you are going 56.23mph. Some folks have installed a 'new' final drive and ended up with a 2.73 ratio from a car.
Dave Mumert
Dave Mumert
Olds, AB
[Updated on: Sat, 18 April 2015 17:58] Report message to a moderator |
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| Re: [GMCnet] Speedo and odometer way of [message #276158 is a reply to message #276157] |
Sat, 18 April 2015 18:03 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Rob,
they drive different on the Interstate than on the Autobahn.
I wouldn't be able to quantify it as better or worse, as it is a
different situation. On the Autobahn it is common to expect speed
differences of 100+km/h, in the US, everybody drives a similar speed.
Well, except that stupid German that only goes just below the speed
limit in his history vehicle :D
--
Best regards
Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA
'76a Eleganza II, VA
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Speedo and odometer way of [message #276159 is a reply to message #276158] |
Sat, 18 April 2015 18:15 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Peer,
Yes, I have driven on the Autobahn many times. Drivers are much more "disciplined." After all for the most part the are Germans! ;-)
You stay out of the left lane unless you are REALLY moving! If you are in the left lane and a vehicle approaches from behind and
flashes their lights GET THE HELL out of the lane because they are going a hell of lot faster than you are. In the USA it is not
uncommon for drivers to sit in the left lane and do the speed limit because "THIS IS MY LANE AND AS LONG AS I DO THE SPEED LIMIT TO
HELL WITH ANYBODY ELSE!"
I am going to disagree with "everybody drives a similar speed" as far as Texas goes, in Houston anyway. It is not uncommon for
people in the left lane to be going 15+ mph above the speed limit and the right lane to be at or below the speed limit.
Regards,
Rob M.
The Pedantic Mechanic
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Peer Oliver Schmidt GMC
Sent: Sunday, April 19, 2015 9:03 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Speedo and odometer way of
Rob,
they drive different on the Interstate than on the Autobahn.
I wouldn't be able to quantify it as better or worse, as it is a
different situation. On the Autobahn it is common to expect speed
differences of 100+km/h, in the US, everybody drives a similar speed.
Well, except that stupid German that only goes just below the speed
limit in his history vehicle :D
Best regards
Peer
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Speedo and odometer way of [message #276162 is a reply to message #276159] |
Sat, 18 April 2015 18:43 |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
Karma: -34
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Senior Member |
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Rob
Your description of the Autobahn brings back pleasant memories of the left
lane and a Saab turbo ....Hmmm, I wonder if it could be made to fit a GMC
?
Mike
On Sat, Apr 18, 2015 at 8:15 PM, Robert Mueller
wrote:
> Peer,
>
> Yes, I have driven on the Autobahn many times. Drivers are much more
> "disciplined." After all for the most part the are Germans! ;-)
>
> You stay out of the left lane unless you are REALLY moving! If you are in
> the left lane and a vehicle approaches from behind and
> flashes their lights GET THE HELL out of the lane because they are going a
> hell of lot faster than you are. In the USA it is not
> uncommon for drivers to sit in the left lane and do the speed limit
> because "THIS IS MY LANE AND AS LONG AS I DO THE SPEED LIMIT TO
> HELL WITH ANYBODY ELSE!"
>
> I am going to disagree with "everybody drives a similar speed" as far as
> Texas goes, in Houston anyway. It is not uncommon for
> people in the left lane to be going 15+ mph above the speed limit and the
> right lane to be at or below the speed limit.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Peer
> Oliver Schmidt GMC
> Sent: Sunday, April 19, 2015 9:03 AM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Speedo and odometer way of
>
> Rob,
>
> they drive different on the Interstate than on the Autobahn.
>
> I wouldn't be able to quantify it as better or worse, as it is a
> different situation. On the Autobahn it is common to expect speed
> differences of 100+km/h, in the US, everybody drives a similar speed.
>
> Well, except that stupid German that only goes just below the speed
> limit in his history vehicle :D
>
> Best regards
>
> Peer
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
Life is too short to hold a grudge; slash some tires and call it even !
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