speedo recalibration
#1
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
#2
#3
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
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
#4
#6
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...
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...
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
#7
Originally Posted by shadyluke
I just thought Ben(Ranger1) said his buddy the ford tech reflashed his truck to compensate for the 35s.
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.
#11
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.
Has anyone else experienced this problem and can it be fixed? Thanks for the help.
#16
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