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Changing tire size with AE

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Old Jun 22, 2016 | 01:20 PM
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Changing tire size with AE

Hi gang . Is there a way to select your own tire size and not use AE's preset numbers. With 32 selected, checking it against GPS and mile markers I'm about 1% off about a mile per hundred. I went to change it and the only selection it will allow is 32.25. With that setting I'm off the other way. Can't find a way to select my own numerals. Am I missing something or is this just one of those it is what it is situations. Thank you
 
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Old Jun 22, 2016 | 01:24 PM
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I hope someone had this answer as I'm having the same issue with the presets.
 
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Old Jun 22, 2016 | 01:39 PM
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Just asking, is it about 1% off, or a static offset across the speed band?

My speedo is consistently 2mph off at all speeds. Was that way from day 1.
 
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Old Jun 22, 2016 | 01:55 PM
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When I had it set to 32 inches the spedometer appear to be dead on but it's hard to see a 1% error. When I said it to 32 and a quarter I can actually see the disagreement across the speed band the truck says it's going about 1 mile an hour faster than it really is. I'd like to be able to make smaller adjustments than a quarter inch. Say .1 or .15. I know 1% seems a little **** but I hand cancalculate mileage and I like for it to be accurate
 
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Old Jun 22, 2016 | 02:11 PM
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So do you compensate for tire wear too?
 
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Old Jun 22, 2016 | 05:14 PM
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These are brand new tires. That's what got me to changing the size to begin with. Like I said I know I'm being a little **** but I just wanted to see if I could play with it and get it exact
 
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Old Jun 22, 2016 | 06:56 PM
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Well at least you acknowledge your OCD.
 
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Old Jun 23, 2016 | 07:15 AM
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We are stuck with the presets in there - they are part of the ABS system. I have learned one thing by playing with all the buttons: I'm either dead-on for speed or dead-on for the odo - but never both. I opted for an accurate odo because I figure my fuel economy with that. My speed plus or minus a few percent is not as critical.
 
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Old Jun 23, 2016 | 09:23 AM
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Tugly, what have you found is the delta in mph between an accurate mph v. odo?
 
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Old Jun 23, 2016 | 11:59 AM
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Originally Posted by Tugly
We are stuck with the presets in there - they are part of the ABS system. I have learned one thing by playing with all the buttons: I'm either dead-on for speed or dead-on for the odo - but never both. I opted for an accurate odo because I figure my fuel economy with that. My speed plus or minus a few percent is not as critical.
I agree Rich, Odo is more important than speedo. Guess I'll have to play with it, see which is closest and compensate manually.
 
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Old Jun 23, 2016 | 12:08 PM
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I emailed AE last year and asked if we could adjust for tire size...they said no.
 
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Old Jun 23, 2016 | 12:43 PM
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Originally Posted by spongecop
I emailed AE last year and asked if we could adjust for tire size...they said no.
Pete- F250-- did this nice write up awhile back. I was just looking to refine the adjustment. Guess not


https://www.ford-trucks.com/forums/8...iguration.html
 
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Old Jun 24, 2016 | 05:22 AM
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The speedo reads high by a couple of miles per hour at highway speed (60-65) when the odo is dead-on.
 
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