speedo calibration help/tuner question
#1
speedo calibration help/tuner question
I have been searching high and low for a tuner for my truck. I need one that will correct my speedo and odometer for larger tires and a new gear ratio. Chysler cant do it and hypertech will only work if i had 4 wheel abs, which i dont. Am i just out of luck? Does anyone know for sure if a gear change changes the speedo in a 97 dakota? Im pretty sure its more off since the change.
Last edited by a-hall; 12-07-2010 at 06:04 PM.
#2
superchips 3715 if you want something for cheap (you can prolly find them for $100-135 now-a-days) it will let you set your tire size to the correct one (measure the actual tire form ground to top of it not what it states as the size, they are not always exact) and it will give you a decent boost in performance...love mine!
****...just realized it says 98-03...not sure why the 97 isn't included maybe look into that deeper and see if you could get it to work...
****...just realized it says 98-03...not sure why the 97 isn't included maybe look into that deeper and see if you could get it to work...
#3
superchips 3715 if you want something for cheap (you can prolly find them for $100-135 now-a-days) it will let you set your tire size to the correct one (measure the actual tire form ground to top of it not what it states as the size, they are not always exact) and it will give you a decent boost in performance...love mine!
****...just realized it says 98-03...not sure why the 97 isn't included maybe look into that deeper and see if you could get it to work...
****...just realized it says 98-03...not sure why the 97 isn't included maybe look into that deeper and see if you could get it to work...
#4
just fold the gear change into the change in tire size. If you geared down (numerically up) then you're going a shorter distance per driveshaft rotation, so you'll put in a shorter tire size. IE for mine, I found out that if I go from 3.55 to 3.92, it will put me damn near calibration because i've gone up on tire size. But I plan to go to 4.10's, and that will put me slightly under calibration.
#5
just fold the gear change into the change in tire size. If you geared down (numerically up) then you're going a shorter distance per driveshaft rotation, so you'll put in a shorter tire size. IE for mine, I found out that if I go from 3.55 to 3.92, it will put me damn near calibration because i've gone up on tire size. But I plan to go to 4.10's, and that will put me slightly under calibration.
#6
2500 RPM, 1:1, 3.55:1, 15.25" radius = 63.9 MPH ("stock" w/ 31" tire)
2500 RPM, 1:1, 4.56:1, 15.25" radius = 50 MPH
2500 RPM, 1:1, 4.56:1, 16.25" radius = 53 MPH (What you have now)
2500 RPM, 1:1, 4.56:1, 19.60" radius = 63.9 MPH (What to tell the computer you have)
#7
Your going to have to change the speedo pinion gear to get the mph readout right , and from what i have been able to find you`ll need to have the abs computer re-flashed for the bigger tire size if it starts acting up and the dealership is " supposed " to be able to do it for a small fee , or disable it all else fails , you`ll need a 36 or 37 tooth speedo pinion gear , depending on which calculator site you use , i used Speedometer Calibration Program - Method 1 which works pretty good , you`ll have to change 2 inputs to these , your drive gear will be 13 and the speedo revs per mile will be 970 , and of course add in your tire and axel gear size , and that will get the size gear you need and this site you can order it from Speedometer Gear, Speedometer Gears, Ford, GM, Dodge 700R4 i ordered my gear from them and they were fast in delivery and best i found on price .
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#8
Your going to have to change the speedo pinion gear to get the mph readout right , and from what i have been able to find you`ll need to have the abs computer re-flashed for the bigger tire size if it starts acting up and the dealership is " supposed " to be able to do it for a small fee , or disable it all else fails , you`ll need a 36 or 37 tooth speedo pinion gear , depending on which calculator site you use , i used Speedometer Calibration Program - Method 1 which works pretty good , you`ll have to change 2 inputs to these , your drive gear will be 13 and the speedo revs per mile will be 970 , and of course add in your tire and axel gear size , and that will get the size gear you need and this site you can order it from Speedometer Gear, Speedometer Gears, Ford, GM, Dodge 700R4 i ordered my gear from them and they were fast in delivery and best i found on price .
#10
Thank you for the reply you seem very informative. Where is the speedo pinion gear and how much will all this set me back. As of now my ABS and brake light will come on and stay on but this has just happened. Today i replaced the speed sensor in the transfer case and the abs sensor in the rear end. How hard is the pinion gear to change and if i do what you say that will take care of the abs light and the incorrect speedo reading?