11-07-2009, 01:50 PM
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CC Member
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Join Date: Sep 2009
Location: Sacramento,
CA
Cobra Make, Engine: ERA 707, 446ci FE
Posts: 1,115
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Not Ranked
Quote:
Originally Posted by dcdoug
Is there something else going on here that I don't understand?
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Well, the answer to that is an obvious yes. 
All things being equal, you should have seen about a 6 percent gain in displayed speed with the first change, and a 10% drop in displayed speed with the second. But you knew that.
Do you have a reversed speedo? Is the reverser unit possibly causing some interference?
Do you have a steady speedo or a bouncy one? The sticking that causes bounce might be contributing to a misread.
That's all I've got on tap. BTW, most GPSes are accurate to better than a percent on freeway speeds.
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