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Registered
Join Date: Jun 2007
Posts: 62
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Speedometer becoming slower and slower
The speedometer on my 1979 911sc has been gradually becoming less and less accurate with time (showing slower speed). At first it only became slow after about 70 mph, but, after a track event this weekend, it got worse. I don't think that it is the magnets, because of the progressive worsening. Any ideas?
Thanks, Coglin |
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08-02-2007, 11:02 PM
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Registered
Join Date: May 2005
Location: Loxahatchee, florida
Posts: 2,894
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might be time to send it to north hollywood speedometer to be reconditioned. there is a signal check that can be done to make sure the sender and the magnets in the differential are working correctly. But i dont know how it's done.
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's. 2019 Silverado 6.2L |
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08-03-2007, 04:25 AM
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19 years and 17k posts...
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N. Hollywood rebuilt my speedometer a few years ago and did a great job.
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Art Zasadny 1974 Porsche 911 Targa "Helga" (Sold, back home in Germany) Learning the bass guitar Driving Ford company cars now... www.ford.com |
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08-03-2007, 06:50 AM
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Slumlord
Join Date: May 2001
Location: Canada
Posts: 4,983
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I would think about putting a very small drop of light machine oil on the bearing. My speedometer shows nothing below 25 mph, and I'm pretty sure it is just friction.
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08-03-2007, 06:59 AM
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Non Compos Mentis
Join Date: May 2001
Location: Off the grid- Almost
Posts: 10,599
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Try driving faster and faster.
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08-03-2007, 07:45 AM
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MazdaSpeed3
