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Need Speedometer fix for 911 SC
Hi, I've only posted a couple of questions, so thanks in advance for your reply. I have a stock '83 SC with 110,000 miles owned 9 months.
Problem is the speedometer reads 10 mph or so low. Odo works, speedometer otherwise works smoothly, tire size is stock/ correct. What do I need to troubleshoot to fix? visconage@verizon.net 
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05-31-2010, 08:14 AM
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Somatic Negative Optimist
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Pelican or North Hollywood Speedo will calibrate and also replace the infamous plastic gear that usually breaks.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats.  Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
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05-31-2010, 09:07 AM
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Senior Advisor
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Check to make sure the pick-up at the transmission is seated and not damaged.
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08 Cayenne Turbo |
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05-31-2010, 09:33 AM
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Thanks for the advice guys. CV
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05-31-2010, 05:28 PM
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Join Date: Jul 2001
Location: Lawrenceville GA 30045
Posts: 7,378
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Interesting. I thought the general consensus was that the speedo's read about 5-10 miles high.
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Mark '83 SC Targa - since 5/5/2001 '06 911 S Aerokit - from 5/2/2016 to 11/14/2018 '11 911 S w/PDK - from 7/2/2021 to ??? |
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05-31-2010, 06:42 PM
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When I'm doing 50 the speedo reads 60 mph just so I've given a clear description of the issue.
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06-01-2010, 02:49 PM
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Senior Advisor
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Mine is spot on according to me and the Washington State Police
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08 Cayenne Turbo |
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06-01-2010, 02:59 PM
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Join Date: Jun 2009
Location: ohio
Posts: 4,306
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same thing for me - when i am doing 70 my speedo says 81-82, which also happens right at about 28-2900 in 5th. i've often wondered how many extra miles the odometer is putting on and how long it has been happening.
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- He gave his father "the talk" - Once while sailing around the world he found a shortcut - He taught a german shepard how to bark in spanish He is.... nineball. I don't always drive sports cars, but when I do I drive a 1983 911SC Targa. Stay fast my friends. |
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06-01-2010, 04:06 PM
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Somatic Negative Optimist
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Speedos are calibrated to read slightly higher, about 5%.
If it reads 10 M/ph higher, it needs to be calibrated. The myth that it should read 5-10 Miles higher is the same myth that one has to come to a full stop to re-set the trip meter.  It'll never die.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD! 1995 seafoam-green 993 C2, LSD, Sport seats. Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ".
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06-02-2010, 07:53 AM
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Wash. State
Join Date: Jun 2006
Posts: 3,569
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Quote:
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06-02-2010, 09:06 AM
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Registered
Join Date: Jun 2009
Location: ohio
Posts: 4,306
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i have 16s, 205/55 and 225/50
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- He gave his father "the talk" - Once while sailing around the world he found a shortcut - He taught a german shepard how to bark in spanish He is.... nineball. I don't always drive sports cars, but when I do I drive a 1983 911SC Targa. Stay fast my friends. |
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06-02-2010, 09:32 AM
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MBruns for President
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North Hollywood will recalibrate it for you - and make it look purty. They also do some nifty custom work...
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Current Whip: - 2003 996 Twin Turbo - 39K miles - Lapis Blue/Grey Past: 1974 IROC (3.6) , 1987 Cabriolet (3.4) , 1990 C2 Targa, 1989 S2 |
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06-02-2010, 11:08 AM
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Thanks for the comments everbody. Seems the concensus is that I should send the meter in for calibration, assuming mo loose or damaged sensor connection at the trans. Chuck
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06-06-2010, 03:32 PM
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I thought the spedometer was just a suggestion? Mine is definitely reads high so I just use the RPM and selected gear to estimate speed.
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Ken '83 SC Cab '11 Audi A4 Quatro 6sp. '02 VW Passatt |
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06-06-2010, 04:22 PM
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I used my GPS to compare to the speedometer reading and found it is was running 8-10 mph faster. Sent it out for calibration... now it is spot on.
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06-06-2010, 05:04 PM
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SOLD IT
Sold
BLU SHRK SOLD
1987 951
ME 262 (SOLD)
Colibri
Gas Mizer
Mileage King
Dog Bus
Gone to California
Turbo
72 911T
84 Porsche Carrera
