Re: [alfa] S3 Spider speedo - update

["Dean W. Cains" <dwc@xxxxxx>]

Hi Tony:

What about the calibration of the tachometer?  While the speedo in my '87 
Spider is terribly slow, the tach actually reads fast, so in my case, I 
can't even use the tach to tell how far over the speed limit I'm 
driving.  I understand that there is a similar trim pot in the tach, but I 
haven't had time to adjust either of the gauges.  Odd thing is that the 
odometer is dead-on accurate.

BTW, have you seen this link?

http://www.alfabb.com/bb/forums/showthread.php?t=2902&highlight=S4+tachometer

Regards,

Dean
Lutz, FL
'74 & '87 Spider Veloce's


At 08:26 PM 8/7/2004, you wrote:

> Date: Fri,  6 Aug 2004 17:46:02 -0400 (EDT)
> From: "Anthony" <tg60@domain.elided>
> Subject: [alfa] S3 Spider speedo - update
>
> Dear All, In the process of resolving the lazy speedo problem on my 
> graduate (87) so common on most S3 spiders I removed the trim pot from the 
> speedometer,  soldered a length of wire (~1.5ft)going from the speedometer 
> to the pot so that I can put the cluster back together but have the trim 
> pot dangling by the fuse panel so that I can tweek the pot without taking 
> the whole thing apart ever again. I had some success whe the pot is turned 
> all the way counter-clock-wise. I say "some" sucess because the speed is 
> accurate at about 5% below normal speed (5th gear 3000rpm 59Mph, should 
> read around 65MPH). The pot will  not go any further. The resistence of 
> the pot is now close to 0 ohms, essentially as if the pot wasn't even 
> there. I think we can conclude that somewhere in the circuit the 
> resistance has increased or some component in the circuit now need more 
> juice to work. The trim pot tests OK,  it's a 220 ohm resistance in the 
> sweeping arm increases and decreases without dead spots. All solder 
> connections are shiney.
>
>
> tonyg
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