Ford Ranger Forum - Forums for Ford Ranger enthusiasts!

Ford Ranger Forum - Forums for Ford Ranger enthusiasts! (http://www.fordrangerforum.com/)
-   Wheels and Tires (http://www.fordrangerforum.com/wheels-and-tires/)
-   -   recalibrate speedo for bigger tires (http://www.fordrangerforum.com/wheels-and-tires/6452-recalibrate-speedo-bigger-tires.html)

Blackhawk 01-20-2010 07:26 PM

recalibrate speedo for bigger tires
 
how do you recalibrate a spedo for bigger tires on a 2 wheel drive 97 ranger

Tom 01-21-2010 01:46 AM

Dealership might be able to do it for you. The most common method is to just buy a tuner.

STL 01-21-2010 02:43 AM

I think ford dealer it is 100 dollars

rwenzing 01-21-2010 08:42 AM

A flash tuner won't work for speedo/odo correction on Rangers before 2001.

95~97 Ranger/Explorers have a gear-driven signal generator on the trans or transfer case for the electric speedometer. Much like a conventional speedo cable, the SG can accept interchangeable gears to correct for tire size and/or axle ratio (within limits of course). Several different gears are available. Check the Tech Library at www.TheRangerStation.com for more info on calculating the correct gear tooth count.

Blackhawk 01-21-2010 08:20 PM

i have to regear then?
 
i have to re gear then to get my speedo to be right?

STL 01-21-2010 08:28 PM

Quote:

Originally Posted by Blackhawk (Post 56003)
i have to re gear then to get my speedo to be right?

You dont have to re gear your rear axle just a part on the transmission

TheStig 01-22-2010 12:08 AM

or just do the math....

i went from 225's to 245's....theres a calculator online somewhere i found through R/F
and i figured out my speedo is 11% slower that what i'm actually doing

so on the highway if my speedo says i'm doing 65 i'm actually doing about 72

mb128 01-22-2010 02:00 AM

i went from 31x9.50 to 33x12.50 and mine is off by 5 mph

Tom 01-22-2010 03:36 AM

Quote:

Originally Posted by mb128 (Post 56181)
i went from 31x9.50 to 33x12.50 and mine is off by 5 mph

It wouldn't be off by a solid number, but by a percentage. Essentially calculate the difference in tire size, and that is the difference in your speedometer.

mb128 01-22-2010 08:47 AM

all i did is i went past one of the radar things in a school zone. speedo said i was going 15 and the radar said i was going 20

TheStig 01-22-2010 12:51 PM

Quote:

Originally Posted by Tom (Post 56193)
It wouldn't be off by a solid number, but by a percentage. Essentially calculate the difference in tire size, and that is the difference in your speedometer.

x2 it won't be off by a set number...it will be off by the percentage difference between tire sizes

surfer03133 01-22-2010 06:03 PM

wont it effect your odometer reading also?

TheStig 01-22-2010 06:58 PM

Quote:

Originally Posted by surfer03133 (Post 56438)
wont it effect your odometer reading also?

yup....

ec_dago_ryder 01-23-2010 07:09 PM

Im going to be puttin 32's on my truck and i was just going to have ford recalibrate but for a little more i could make my engine a little more fuel effecient with a tuner.

do they have any tuners for a 08 ranger 2.3l? because ive looked plenty of times and ive never been able to find one.


All times are GMT -7. The time now is 07:30 AM.