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post #1 of 11 Old 12-14-2009, 01:01 PM Thread Starter
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Speedo calibration

I know they are only 33 in tires but any idea of how much they through off the speedo. Also would the speedo being off also make my odometer wrong too? Just curious about this for oil changes. Didn't know how far off it....
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post #2 of 11 Old 12-14-2009, 01:02 PM
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when I ran 33's it was only like .5-1 mph off... and yes it does affect your odo.

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post #3 of 11 Old 12-14-2009, 03:02 PM Thread Starter
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It would show more on your odometer than you really have correct?
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post #4 of 11 Old 12-14-2009, 03:17 PM
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Anyone nearby that has AE? They could recalibrate the speedo for you. Or you could go to Ford to have it adjusted. But for 1 mile off, I probably wouldn't worry about it...

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You will get some axle wrap with a heavy trailer, I can feel it when towing my gooseneck with some heavy equipment. My Deavers will wrap enough to make the tires rub the front of the rear fender well if I give it too much throttle on aceleration.
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post #5 of 11 Old 12-14-2009, 07:00 PM Thread Starter
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Anyone nearby that has AE? They could recalibrate the speedo for you. Or you could go to Ford to have it adjusted. But for 1 mile off, I probably wouldn't worry about it...
thanks, fig it wasn't much just wanted a second opinion.
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post #6 of 11 Old 12-14-2009, 09:58 PM
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If your stock tires are 265/75R16 your speedometer should read about 57.5 when you are actually going 60mph. Your odometer will also be off by the same amount. Say for every 5000 miles you travel your odometer will only register about 4788 miles.
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post #7 of 11 Old 12-15-2009, 01:49 AM Thread Starter
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thanks
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post #8 of 11 Old 12-15-2009, 02:57 AM
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You can find "calculators" online that will do the math for you, but you can also just calculate the circumference difference. 35s changed mine 7%. I would just add 7% to the miles driven when calculating mpg. I recently discovered that my AE would calibrate the speedo and now it it dead on!

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post #9 of 11 Old 12-15-2009, 03:58 PM Thread Starter
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AE?? what else can it do?
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post #10 of 11 Old 12-16-2009, 02:56 AM
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AE?? what else can it do?
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