I'm running 29" tall tires with this combo

David Marshall

Fast Forward Automotive Inc.
4356 Quesnel-Hixon Road
Quesnel BC Canada  V2J 6Z3

http://www.fastforward.ca    mailto:sales@fastforward.ca
Phone: (250) 992 7775        FAX: (250) 992 1160

- Vanagon Accessories and Engine Conversions
- Vanagon, Transporter and Iltis Sales and Importation
- European Lighting for most Volkswagen models

Due to the large volume of email  we  receive,  PLEASE  include  previous
emails when responding.  This will allow us to read the complete dialogue
in one message and will result in quicker and more  accurate  responses.

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf
Of ccc1
Sent: May 21, 2004 12:14 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Syncro Speedometer

David:
When you switched from 1000 to 950 on the KMH speedometer to get a more
accurate speedometer, was that with the OEM tire size, or was your
speedometer inaccurate (reading low) because you had switched to taller
tires?  Like
Budd, I am having a problem with the math.

Cary

----- Original Message -----
From: David Marshall <vanagon@VOLKSWAGEN.ORG>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, May 21, 2004 9:43 AM
Subject: Re: Syncro Speedometer

> Yes, I have done this for one of my Syncros - 950 vs 1000 for the KMH
> speedometers - you have to change the face plate along with it, but not a
> big job.  I did this to get a more accurate speedometer and a face that
> matches the Jetta II Diesel tach I installed.
>
> Just make sure you use a VDO and not a Motometer speedometer - swapping
the
> back plastic housing is all that is required.
>
> David Marshall
>
> Fast Forward Automotive Inc.
> 4356 Quesnel-Hixon Road
> Quesnel BC Canada  V2J 6Z3
>
> http://www.fastforward.ca    mailto:sales@fastforward.ca
> Phone: (250) 992 7775        FAX: (250) 992 1160
>
> - Vanagon Accessories and Engine Conversions
> - Vanagon, Transporter and Iltis Sales and Importation
> - European Lighting for most Volkswagen models
>
>
> Due to the large volume of email  we  receive,  PLEASE  include  previous
> emails when responding.  This will allow us to read the complete dialogue
> in one message and will result in quicker and more  accurate  responses.
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf
> Of Budd Premack
> Sent: May 21, 2004 12:39 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Syncro Speedometer
>
>
> Can a Jetta speedometer with the ratio 1540 be substituted for a Syncro
> speedometer with the standard 1600 ratio?  If so, will the typical 4% low
> speed reading be altered to about 8% low, or will it tend to correct to
> close to an accurate reading?
>
> My rusty math and high school physics concepts suggest to me that if the
> replacement speedometer had a ratio of 1664, the common 4% low error would
> be corrected.
>
> (1600-1540) / 1600 = 3.75% fewer revolutions (?)
> (1664-1600) / 1600 = 4.00% more revolutions (?)
>
> BTW, does anyone have a spare Syncro speedometer?
>
> Budd Premack
> 86 Syncro, 88 Wolfsburg
> Land of Sky-Blue Waters
> Minneapolis, MN
>
>