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Calibrating 911 Carrera VDO Speedometer and Tachometer, How do you do it?
Help!
Has anyone ever calibrated their own speedometer or tachometer, I have the background in electronics but I don't have a procedure. I know, some may say just send it to a shop but I'm curious on how to do it, but just in case who in California can do it and for how much? Both are the electronic type VDO's, I suppose that if you gradually supply current at different intervals and compare a reading to a standard reference point this is how it might be done....help! Don't let me guess, anyone with a procedure would greatly appreciated. Best Regards, Alex
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Its easier asking dumb questions than fixing dumb mistakes 1974 Porsche 911 Coupe, RSR Project 1976 Porsche 911 Targa, Black 1986 Porsche 911 Carrera, Black 2006 Porsche Cayenne S, Black |
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03-14-2005, 05:22 PM
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Irrationally exuberant
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The 911 tachometer gets 3 ~12v pulses every revolution. I don't know if there is a means to calibrate it. See my post in this thread for a little more info. Tachometer pulses per Rev??
-Chris
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'80 911 Nogaro blue Phoenix! '07 BMW 328i 245K miles! http://members.rennlist.org/messinwith911s/ |
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03-14-2005, 05:36 PM
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Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
Posts: 21,140
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a few guys have done the speedo. try my screen name and speedo in search.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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03-14-2005, 05:59 PM
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Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
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Here is a way you can calibrate an electronic speedo without opening it.
http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=359385&prmenbr=361 |
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03-14-2005, 06:04 PM
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Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,521
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Or, take it to a shop like Hollywood speedo, they put your car on a dyno, and calibrate your speedo to be dead nuts on.
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Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
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03-14-2005, 06:07 PM
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Registered
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Thanks everyone, this information is greatly appreciated.
Best Regards, Alex
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Its easier asking dumb questions than fixing dumb mistakes 1974 Porsche 911 Coupe, RSR Project 1976 Porsche 911 Targa, Black 1986 Porsche 911 Carrera, Black 2006 Porsche Cayenne S, Black |
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03-14-2005, 10:27 PM
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The Blue Pheonix
