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| Speedo http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=88&t=56906 |
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| Author: | tools113 [ Mon Nov 15, 2010 3:53 pm ] |
| Post subject: | Speedo |
I have noticed that the faster I go the more difference there is between how fast i really am going and what the speedo registers according to my speedo I am going 35 but actually going 34 when registering 45 actual is 43. When registering 75 my actual speed is 72 
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| Author: | BrendonR [ Mon Nov 15, 2010 4:39 pm ] |
| Post subject: | Re: Speedo |
That's because your Speedometer - Actual speed is not a linear relationship, but an exponential one. Short answer; the rolling diameter of your tires is smaller than your vehicle is programed to think it is. Your wheels are not traveling 3x faster, but rather 3% faster. Long Answer; The Revolutions/mile on my stock tires (235/60R18) = 693 The Revolutions/mile on my winter tires (235/65R17) = 695 My Liberty thinks that the tires revolve 693 times for every mile traveled, but when my winter tires are on, they are revolving 695 times. This is a difference of 2.8%. For every MPH, the difference will be 2.8% speed. 30MPH SPEEDO READING = 30mph x (1 - 2.8%) = 29.91mph ACTUAL speed. Difference of 0.09 mph 70MPH SPEEDO READING = 70mph x (1 - 2.8%) = 69.79mph ACTUAL speed. Difference of 0.21 mph 500MPH SPEEDO READING = 500mph x (1 - 2.8%) = 498.561mph ACTUAL speed. Difference of 1.44 mph |
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