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Re: [T3] those rubber bump stoppers

On 29 Oct 2005 at 15:16, Stephen Jackson wrote:

> The speedo cable is on the FRONT wheels?  How bizarre!  Most cars I have 
> worked on have that on the trans. counting driveshaft revolutions...having 
> it on the wheel guarantees inaccuracy while making a corner....

The corner problem tends to average itself out, unless you're just 
driving around in circles, or ovals.

For cars running Time/Speed/Distance rallys the hi-performance setup 
was to add a speedo cable to one of the front wheels, if the car was 
rear wheel drive. This was done because any corner error tended to 
average itself out while errors from wheelslip were always larger on 
the drive wheels. Rear engined Porsches and VWs were thought to have 
an advantage here because of the way they came from the factory.   

The extra speedo cable was generally added to the OUTSIDE of the 
wheel. It looped out from the body and came in and attached to the 
hubcap. I believe it was Heuer that made a kit for this, as well as 
the early computer that attached to it.   

A friend and I did some TSD rallying in his 64 Beetle in around '69 
and never did very well, except for the one time we won with an 
accumulated error over the ~2 hour course of just one second. That 
was a complete fluke, but I still have the navigator's trophy.   ;-)

We couldn't afford the expensive Heuer equipment. All I had was a 
slide rule and a watch with a sweep second hand. It's a very pleasant 

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

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