Wheel change causes Nav errors
Thread Starter
Junior Member
Joined: Jan 2016
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Wheel change causes Nav errors
All,
I hope this has been discussed before and addressed by the customer service folks already, but I could not find it searching the forums.
here is the issue. I have 2014 FX4. I changed the 20" wheels out for stock 2011 Raptor wheels and tires. Now my Nav is off by 100yards or so, this is a big problem using it in D.C. Anyway, Ford Dealer says no problem they can fix it for $250.00? why would this be an issue that they have not solved? Truck owners change wheels and tires. WHY would they make it such that it would cause problems in the Nav or ABS errors?
then why charge to have it corrected?
is everyone else in the same boat?
thanks
Geroge
I hope this has been discussed before and addressed by the customer service folks already, but I could not find it searching the forums.
here is the issue. I have 2014 FX4. I changed the 20" wheels out for stock 2011 Raptor wheels and tires. Now my Nav is off by 100yards or so, this is a big problem using it in D.C. Anyway, Ford Dealer says no problem they can fix it for $250.00? why would this be an issue that they have not solved? Truck owners change wheels and tires. WHY would they make it such that it would cause problems in the Nav or ABS errors?
then why charge to have it corrected?
is everyone else in the same boat?
thanks
Geroge
Moderator (Ret.)
Joined: Sep 2008
Posts: 9,460
Likes: 486
From: Lake Mary Florida
Automotive manufacturers use electronic speed sensors and an electronic speedometer. It comes from the factory calibrated to the tire/wheel size your truck had when it was built. Even in the days of a cable driven speedometer, if you changed the tire/rim size, you had to install a device (or change the plastic gear in the transmission speedometer drive) between the transmission and speedometer to compensate.
Go to any tire web site; they have calculation programs that you can plug in your old tire/rim size, and then your new tire/rim size, and this program will tell you how many MPH you are off. This simply equates to the distance traveled being different with your larger (or smaller diameter tire/rim setup.
Yes, either your Ford (or any speedometer repair shop) can easily recalibrate this, or a good tuner can. My Evolution tuner allows me to change the tire size on my truck to compensate for under/oversized tires/rims.
Go to any tire web site; they have calculation programs that you can plug in your old tire/rim size, and then your new tire/rim size, and this program will tell you how many MPH you are off. This simply equates to the distance traveled being different with your larger (or smaller diameter tire/rim setup.
Yes, either your Ford (or any speedometer repair shop) can easily recalibrate this, or a good tuner can. My Evolution tuner allows me to change the tire size on my truck to compensate for under/oversized tires/rims.
Last edited by Mod (Ret.); Jan 27, 2016 at 11:52 AM.
Thread Starter
Junior Member
Joined: Jan 2016
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Bucko,
thanks. it all makes sense. just frustrating that the Navigation would get so out of whack. Changing wheels and tire on trucks & 4x4 should be expected. the Nav is useless, especially in the City where being off by even 50 yards makes a huge difference in which exit or turn you have to make. Guess I will just use google on the phone. I do have an SCT tuner on the horizon, maybe it will help.
George
thanks. it all makes sense. just frustrating that the Navigation would get so out of whack. Changing wheels and tire on trucks & 4x4 should be expected. the Nav is useless, especially in the City where being off by even 50 yards makes a huge difference in which exit or turn you have to make. Guess I will just use google on the phone. I do have an SCT tuner on the horizon, maybe it will help.
George
Moderator (Ret.)
Joined: Sep 2008
Posts: 9,460
Likes: 486
From: Lake Mary Florida
Bucko,
thanks. it all makes sense. just frustrating that the Navigation would get so out of whack. Changing wheels and tire on trucks & 4x4 should be expected. the Nav is useless, especially in the City where being off by even 50 yards makes a huge difference in which exit or turn you have to make. Guess I will just use google on the phone. I do have an SCT tuner on the horizon, maybe it will help.
George
thanks. it all makes sense. just frustrating that the Navigation would get so out of whack. Changing wheels and tire on trucks & 4x4 should be expected. the Nav is useless, especially in the City where being off by even 50 yards makes a huge difference in which exit or turn you have to make. Guess I will just use google on the phone. I do have an SCT tuner on the horizon, maybe it will help.
George
Surprised that the new NAV units are using the vehicle speed sensors, rather than the GPS signal itself. Then again, the current NAV satelites ore only accurate to a certain point as well; maybe this is why manufacturers use the vehicle speed to judge distance.
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Joined: Feb 2015
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That SCT tuner will have the capability to allow you to update the PCM with a tire/rim change.
Surprised that the new NAV units are using the vehicle speed sensors, rather than the GPS signal itself. Then again, the current NAV satelites ore only accurate to a certain point as well; maybe this is why manufacturers use the vehicle speed to judge distance.
Surprised that the new NAV units are using the vehicle speed sensors, rather than the GPS signal itself. Then again, the current NAV satelites ore only accurate to a certain point as well; maybe this is why manufacturers use the vehicle speed to judge distance.
I noticed the other day that my GPS was a little wacky and just went to a 275/60R20, which is an inch taller than stock. I did readjust the speedo using my SCT X4 but i think its still a few mph off.