[Vwdiesel] Speedo drive gear

[Roger Brown]

15t -> 16t should slow it down 6.7%, or 4MPH at 60.

Yes, +/- 10% is about what mechanical speedos are rated for.  And good speedometer shops 
can re-calibrate the speedo to read closer, although the odo will still be off.


On 12/13/2014 11:47 AM, Brian Decker wrote:
> My friend who was a service rep for VW in the 80's said VW wouldn't warrantee a Speedo unless it was more than 10 % off. A change of drive gear will change it  a lot. Perhaps  a change in tire diameter is in order? ?
>
> -----Original Message-----
> From: Vwdiesel [mailto:vwdiesel-bounces at vwfans.com] On Behalf Of Roger Brown
> Sent: Saturday, December 13, 2014 10:44 AM
> To: vw fans
> Subject: Re: [Vwdiesel] Speedo drive gear
>
> Tooth count and ratio info below:
> http://www.4crawler.com/Diesel/VW_020_transmission.shtml#Speedometer
>
> One would think more teeth on the driven gear would make it turn slower.
>
>
> On 12/13/2014 8:54 AM, dieseltdi at verizon.net wrote:
>> OK, I finally have a working speedometer in my Jetta again.  Now, I would really like to fine tune the speedo as it is just a bit off according to the GPS.  It measures about 4 mph fast and the odometer is high by about .16 miles.  So…..I currently have the red speedo drive gear  in my ACH transmission because that is “the one you are supposed to use”.  Would changing to the white drive gear speed up my measurement or slow it down?  Obviously I need to slow the thing down a bit.   So what say the gurus?  Hayden
>>
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