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-   -   Speedometer and Odometer question (http://forums.pelicanparts.com/porsche-911-technical-forum/295266-speedometer-odometer-question.html)

Mark Davis 07-25-2006 07:01 AM
Speedometer and Odometer question
 
Is it possible for the speedometer to read incorrectly and still have the Odometer reading correctly.

Thank You

Mark

Rot 911 07-25-2006 07:10 AM
Yep. They run off separate mechanisms. I would suggest this is the rule as opposed to the exception on most 911's.

2.7RACER 07-25-2006 07:48 AM
Mark,
Thats a great question. If the odo works right, why are most speedo's optomistic by 10%. Is this one of those marketing decisions?
How does the odo get it's signal? Maybe my Carrera has less mileage than it shows.

Rot 911 07-25-2006 07:55 AM
Quote:
Originally posted by 2.7RACER
Mark,
Thats a great question. If the odo works right, why are most speedo's optomistic by 10%. Is this one of those marketing decisions?
How does the odo get it's signal? Maybe my Carrera has less mileage than it shows.
The "optimism"is built in at the factory for the speed reading. However the odometer is geared to be accurate off the signal. This is not limited to Porsche. Many manufacturers do the same thing.

Mark Davis 07-25-2006 02:18 PM
Thanks for the information. It is nice to know that the milage is correct on the car. Now all I have to do is have the speedo fixed so I don't have to explain to the girl friend that I am not realy going that fast.

Thanks again
Mark


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