SPEEDOMETER

[The Hustler]

Years ago I was pretty good at math, but not anymore! So the question is, my odometer reads .8 mile on a one mile measured course, so is the speedometer reading high or low?

 

[PotvinGuy]

Low...the speedo reading is just the time derivative of the odo reading, and basic differential calculus tells us that the derivative is a positively related function of the variable, therefore it moves in the same direction. I had this same discussion with Steven Hawking just last week...

 

[Dirt-T]

Wow over my head. My logic is as your slower because you have reached your destination but the meter has not.

 

[meangreen]

More simply put... If your odometer is reading low, so is your speedometer. When your speedo reads 40 you are actually going 50! Maybe you have a 3.00 gear in the rear end, but the speedometer gear in the trans is calibrated for a 3.50. (This is just an example because I have no idea what you actually have.) Take the speedo gear out and look for one with fewer teeth. If your speedometer has an electric sender it just needs recalibration.

 

[RPM]

Have you seen the GPS speedometers? No sending units and no calibration. They have them in all kinds of sizes and faces as well as different speed ranges.

http://www.speedhut.com/gauge/GR338-GPS-10/1/GPS-Speedometer-Gauge-260mph

 

[Francis Blake]

A little pricey but I think it would be well worth the price.

 

[PotvinGuy]

I don't have no steenkin' speedometer in my T. I just memorized a few tach-speedo pairings. 2000 RPM is 50 MPH, etc. I saw a tach at a cruise this year and the guy had put some little stick-it numbers on it for 30, 50, etc. MPH.

 

[409T]

Don't need one. The nice police man will tell you how fast you were going.

 

[The Hustler]

You guys are great, thanks for all the neato answers. I love the sense of humor!!!!!

 

[ba60]

I have the speedhut speedo and it works great. It will even give 1/4mi. times. Looks good and never needs calibrated.