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| 2.0 Liter Gas Discussion area for the venerable 2.0 liter 4-cylinder engine. |
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06-24-2011, 06:47 PM
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Speedo is WAY off....
I had a cop flash his blue lights at me the other day. I looked at my speedo and it's reading 46 mph. The road is marked 45mph. So, I got a GPS app for my Iphone and checked the car. My speedo is at 55 and the GPS says I'm going 63mph.
So I doubled checked with other cars and the GPS is right on with the other cars. Today I went out and measured my tires on my car. They measure 24.75". Factory tires are 24.5".So what gives? Any ideas how to correct this? A lot of people from my work call me speedy, and I couldn't understand why they were calling me that. Now I know. After all, I thought I was doing the speed limit!
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"Deutsche Stahl" 
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06-24-2011, 06:49 PM
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Very strange, usually the speedo says you are faster than you really are!!
What size are the tires? It's the rolling radius that counts for the speedo. Kate
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06-24-2011, 07:14 PM
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P235/40zr18.
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06-24-2011, 07:23 PM
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Ok. Did some research...
VW NB common sizes- 205/60/15 are 24.7" and 205/55/16 are 24.9" My tires spec at 25.4" I don't think 1/2" is going to changed the speedo by 8mph.
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06-24-2011, 07:33 PM
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Tire size calculator
says... 2.1% out 60 mph speedo is actually 61.3 so not as far out as you are finding with your car?!
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06-24-2011, 09:03 PM
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I'm running 225/40zr18's and I actually think that mine is pretty much right on now.
 I had a gps for my 3100 mile trip to the Tail and Florida and back and I am pretty much spot on as far as speed goes.  My mileage to work has gone down a little though.  Nice calculator. My setup is only 0.2" difference.
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-> O.  http://newbeetle.org/forums/photos-n...0-5-speed.html http://www.nivaclub.org/ http://www.facebook.com/pages/Statel...65240150169127 Last edited by Opelmania; 06-24-2011 at 09:05 PM.. Reason: Added my difference.
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06-27-2011, 01:58 AM
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Quote:
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06-28-2011, 02:20 PM
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Quote:
 I like the speed sensor idea.  Hope you get it sorted out.
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06-30-2011, 03:25 PM
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I think I've found the problem. My needle on my speedo falls down onto my gas gauge when sitting still. It's over a 1/2" below the "0" mark. Any ideas ?
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07-02-2011, 05:21 AM
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try having the speed read 80mph when you're really going 110mph. had that happen to me yesterday
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07-10-2011, 02:50 PM
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Update
Ok finally figured it out. Somebody took the speedo apart and put it back together wrong. They must of had a different speedo face on it and kept it or sold it before I got the car. The speedo was off the same at 30 mph and at 60 mph. To repair it, I took off the needle and turned on the ignition and replaced needle at zero with speedo energized. Now according to my GPS I'm only 1 mph off at all speeds.
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07-11-2011, 04:10 PM
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Cool. That was an easy fix.
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