[T3] Recalibrate speedometer

Jim Adney jadney at vwtype3.org
Thu May 7 14:42:17 PDT 2015

On 7 May 2015 at 13:24, Jacob Adam Schroeder wrote:

> Yes.  So my needle does not move off at all until I'm going about 10 mph.
> When I'm driving at 30 mph (according to my smartphone's GPS), the
> speedometer reads 20 mph.  When I'm driving at 70 mph, the speedometer
> reads 60.  I will confirm again on my drive home from work, but it appears
> that my speedometer registers 10 mph under regardless of which speed I
> drive.
> I have owned this car for about 20 years and I have never taken this apart,
> whether the PO did is another question.

The other question that needs to be asked is whether your front tires 
are standard size. If they are smaller than the stock 165-15 size, 
then the speedo will read low, but the odo will also read low. In 
that case, however, the error will be proportional to the speed. So 
the error at 60 mi/hr will be twice as big as that at 30.

That problem can also be fixed, but it requires changing the speedo 
gearing, but only an authorized VDO shop will have the right parts. 
There are a few such shops in the US. I'm sure they do good  
work, but they also charge real $$$.

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

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