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afterburn 549's Avatar
 
Join Date: Jul 2003
Location: cross roads
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spedo error

my speedo reads about 10 mph faster then real world time. Is this normal Porsche ticket limiter?
Would like some clues here as to what might cause this.
maybe someone put in a diff ring and pinion ?

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Old 10-12-2005, 02:20 PM
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Conventional wisdom is that Porsche speedos will usually read about 5 mph fast. This is affected by your wheel and tire choice of course. The speedo is internally adjustable if you care to take it apart.

ianc
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BMW 135i. Nice. Fast. But no 911...

"I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79
Old 10-12-2005, 02:27 PM
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hmmm take it apart???????/will it be sort of obvious??
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D troop 3/5 Air Cav, and 162 AHC- Can Tho

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freedom has a flavor the protected will never know.
Old 10-12-2005, 04:22 PM
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You need to (carefully) pry the back side of the black bezel off the lip of the gauge itself to let you get at the guts of the gauge. once the circuit board inside is exposed, there's an adjustable pot you can tweak to change the speedo reading for a given input from the speedo sensor. If you search here you'll find some more info about it,

ianc
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BMW 135i. Nice. Fast. But no 911...

"I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79
Old 10-12-2005, 04:33 PM
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Thankyou
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D troop 3/5 Air Cav, and 162 AHC- Can Tho

For those who have fought for it,
freedom has a flavor the protected will never know.
Old 10-12-2005, 04:55 PM
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I compared mine to my GPS while on the interstate (82SC) and above 45mph the error was about 5 mph OVERstated.

Paul
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Paul
'87 Carrera cab; '19 Ford Flex for the Dane and Lab '04 F-150 for the bigger stuff; '18 Volvo V60 Cross Country for being an adult
'96 993 cab (gone, oops); '82 SC (gone)
Old 10-12-2005, 05:36 PM
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My 82 SC speedo reads about 10% fast. Trip meter quit this summer. Plan to have the speedo send to

http://www.nhspeedometer.com/index.htm

or

http://www.paspeedo.com/about.htm

during the winter sleep.

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1982 911 SC Targa - Rosie....my Mistress. Rosewood Metallic on Dark Brown and Black. Long distance road warrior and canyon carver.
Old 10-12-2005, 07:30 PM
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