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  #1  
Old 10-19-2005
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speedo recalibration

I called the dealer in my area today to see about having my speedo recalibrated for my 265/75/16. They told me that Ford cannot do it. What do I have to do to get it fixed. I don't really care about speedo being correct, I have a GPS so I know about how fast I am really going compared to what it says, I just want the odometer to be correct. Even tho itz a lil off now since I have been driving around for 4k miles without it right. Anyone help me out with who to talk to or what to tell the dealer. Thanks, Luke
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Old 10-19-2005
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i think superlift makes somethin for like 200 but not worth it..

get a tuner that will fix it :)

go to local shop they might have a computer diagonis thingy and will reset it..thats what i did....
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Old 10-19-2005
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Ford can do up to a 30.7" diameter tire with a 4.10 axle ratio. Yours is about 31.6. If your original size was a 245/75R16, you're only talking about a 4% speedometer/odometer error or about 2 MPH slower at 50 MPH. Given that most stock Ranger speedos read about that much fast at 50, you're probably in good shape.

If you still want/need to correct it, you should be able to use a recalibrator in the VSS wire:

http://www.bluegauges.com/prod_yellow_box.htm
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Old 10-19-2005
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hmmm....I guess I am just gonna live with it the way it is. I just thought Ben(Ranger1) said his buddy the ford tech reflashed his truck to compensate for the 35s. Oh well, time to not care anymore I guess.
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Old 10-20-2005
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good call, i thought it was for up to 31 (rounding up) as well.

sarahs gettin 285/75/16s on soon so hers will be off by about 8-10% and read 5 mph faster...

so how i add that into the milage? so i can keep track for gas milage...
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Old 10-20-2005
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Quote:
Originally Posted by optikal illushun
good call, i thought it was for up to 31 (rounding up) as well.

sarahs gettin 285/75/16s on soon so hers will be off by about 8-10% and read 5 mph faster...

so how i add that into the milage? so i can keep track for gas milage...
If you are changing from 245/75R16 to 285/75R16, your speedometer and odometer will read 7.8% low or 92.2% of what it did before. [This assumes that you will not be changing the axle ratio which also influences the speedometer reading on 2001-up (and 97-back)].

The speedometer will read about 7.8% slower than actual meaning that the truck will be traveling at about 65 when the speedo says 60.



To correct the odometer reading, multiply the indicated odometer miles by 1.084 to get actual miles.

1/0.922 = 1.084
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Old 10-20-2005
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Quote:
Originally Posted by shadyluke
I just thought Ben(Ranger1) said his buddy the ford tech reflashed his truck to compensate for the 35s.
The max tire size that can be reflashed for is 30.7" which is the true diameter of a Level II "31".

A well-informed tech may have been able to "fool" the calibration by entering a phony axle ratio and tire diameter combination: 30.7" tire and 3.55 RAR, for example. I don't know if it's possible to do that at the dealership level but may be if the tire diameter and axle ratio can be entered separately.
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Old 10-20-2005
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oops, glad u caught that. i know it'll read slower from experience.

thanx bob!
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Old 10-20-2005
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ah just buy a tuner from doug. it will be recalibrated and u get added power :)
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Old 10-20-2005
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tires cost $$

tuner cost $$

not enough $$ for both =-P
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Old 10-20-2005
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I have the stock setup on my 2004 Ranger Edge and my speedometer reads low by about 2-5 mph depending on speed. At 60 on the gauge in the truck the gps reads about 58. At 75 on the gauge in the truck the gps reads 70.

Has anyone else experienced this problem and can it be fixed? Thanks for the help.
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  #12  
Old 10-20-2005
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speedometer can be off 2-5 % when the truck rolls off the line.
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Old 10-20-2005
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Quote:
Originally Posted by optikal illushun
tires cost $$

tuner cost $$

not enough $$ for both =-P

understandable but just drive with it off for a while
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  #14  
Old 10-20-2005
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Ford recalibrated my speedo for 265/75r16's for $50 and didn't give me any trouble. They said they can do whatever size will fit on the machine. Thats my dealer atleast.
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  #15  
Old 10-20-2005
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Yeah apprently Ford has different computer systems and some let them do stuff like that and some of the techs are too ignorant to know how to do it.
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  #16  
Old 10-24-2005
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huh. I have stock gears on my truck w/ 33's, and it does read faster - but its okay. I'll just play dumb to the cop.... "no officer, according to my speedometer, I was going 60!"

hehehehe....
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