My speedometer is reading wrong - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 01-09-2007, 05:00 PM Thread Starter
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My speedometer is reading wrong

When i drive, my speedometer makes it seem like im going faster than i actually am. Does anyone know how to adjust this so it will tell me the right speed?
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post #2 of 9 (permalink) Old 01-09-2007, 05:28 PM
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What size tires/rims are on the car?

Moving to Vintage.

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post #3 of 9 (permalink) Old 01-09-2007, 06:02 PM Thread Starter
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14 inch stock
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post #4 of 9 (permalink) Old 01-09-2007, 06:05 PM
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70 series tires? And how much faster?

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post #5 of 9 (permalink) Old 01-09-2007, 07:02 PM Thread Starter
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its about 5 to 10 mph faster than im going,
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post #6 of 9 (permalink) Old 01-09-2007, 07:10 PM
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Make sure you have 70 series tires. I recall quite a few folks who put 75 series on their cars because they were less expensive. Result is an inaccurate speedometer.

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post #7 of 9 (permalink) Old 01-10-2007, 06:11 AM
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I dont know where you are located, but palo alto speedo or north hollywood speedo can make any adjustments you need.

Mike
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post #8 of 9 (permalink) Old 01-10-2007, 02:03 PM
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Quote:
Originally Posted by 1976240D
When i drive, my speedometer makes it seem like im going faster than i actually am. Does anyone know how to adjust this so it will tell me the right speed?
It's very possible it was that way when new. Many speedometers of that era were, shall we say, generous. Even today, USA DOT regulations allow errors of (I believe) 0% slow and 10% fast. At 60-70 MPH, there's your 5-10 MPH error.

It's probably 100% mechanically driven - only way to change it is by altering the drive gear or changing something internally. The speedo shops can probably do it if you can tell them exactly *how* you want it changed.

Get them to roll a few 1000 KM's off it at the same time <joke>

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post #9 of 9 (permalink) Old 01-10-2007, 02:05 PM
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I have 205-70's on my W115 240D car and it shows about a 5mph difference slower than actual speed.

NH speedo does good work but they're expensive but they do have a rack that they put the drive wheels on to test accuracy.

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