Posted by MoparNorm on Thursday, July 05, 2007 at 01:22:44 :
In Reply to: Speedometer posted by Arthur P. Bloom on Wednesday, July 04, 2007 at 19:35:02 :
Speedometer errors are most commonly errors of percentage.
Example: a speedometer gear ratio that is off by 10% will register 110 mph at an actual 100, 55 @ an actual 50 and so forth. To be off by 5 mph @ 25 and again at 30 mph is a huge error of nearly 25%, but confusing because it is a constant 5 mph.
Either the actual error is 4.5 and 5.5 mph respectively, or the error is not in the speedometer gear. If the error of 5 mph is a constant, ALL the way through the speedometer readings, it's in the zero set point of the needle, NOT the speedometer gear.