Topic Sponsor
2021+ Ford F150 Discussion of the 14th generation F150.
Sponsored by:
Sponsored by: Real Truck

Unmatched speedometer

Thread Tools
 
Search this Thread
 
Old Jan 4, 2023 | 12:46 PM
  #1  
zebvance's Avatar
Thread Starter
Senior Member
Photogenic
Photoriffic
Shutterbug
Top Answer: 1
 
Joined: Nov 2020
Posts: 327
Likes: 127
From: Texas
Default Unmatched speedometer

Anybody else have this issue? Bugs the heck out of me. 2022 3.5l xlt
Reply
Old Jan 4, 2023 | 12:57 PM
  #2  
henfield's Avatar
Senior Member First F150
5 Year Member
Community Influencer
Liked
Loved
 
Joined: Apr 2020
Posts: 4,708
Likes: 1,981
From: Boston, Ma
Default

er......whats the issue?
Reply
Old Jan 4, 2023 | 01:01 PM
  #3  
zebvance's Avatar
Thread Starter
Senior Member
Photogenic
Photoriffic
Shutterbug
Top Answer: 1
 
Joined: Nov 2020
Posts: 327
Likes: 127
From: Texas
Default

Originally Posted by henfield
er......whats the issue?
Speedometers are unmatched. Digital is 80 and gauge always shows more then digital.
Reply
Old Jan 4, 2023 | 01:27 PM
  #4  
Dan Texas's Avatar
5 Year Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2018
Posts: 240
Likes: 105
Default

Well, that’s pretty simple, actually; the right side of your truck is going faster than the left. Probably due to rust on your differential. You just need to steer a bit to the left until it corrects.

Seriously, I would find that fairly annoying as well. Hope you’re not too OCD. Is the analog gauge a direct physical linkage? Anybody know it there’s a way to adjust it? Is it always off the same ~2 MPH, or is it off by a percentage of the speed?
Reply
Old Jan 4, 2023 | 01:31 PM
  #5  
zebvance's Avatar
Thread Starter
Senior Member
Photogenic
Photoriffic
Shutterbug
Top Answer: 1
 
Joined: Nov 2020
Posts: 327
Likes: 127
From: Texas
Default

Originally Posted by Dan Texas
Well, that’s pretty simple, actually; the right side of your truck is going faster than the left. Probably due to rust on your differential. You just need to steer a bit to the left until it corrects.

Seriously, I would find that fairly annoying as well. Hope you’re not too OCD. Is the analog gauge a direct physical linkage? Anybody know it there’s a way to adjust it? Is it always off the same ~2 MPH, or is it off by a percentage of the speed?

LOL! Not sure if there is a physical linkage. Its always off 2-3 mph regardless of speed.
Reply
Old Jan 4, 2023 | 02:01 PM
  #6  
16IngotFX4's Avatar
has left the building
 
Joined: Jan 2020
Posts: 9,647
Likes: 3,421
Default

Looks like could be about 1mph difference.

My 2016 was similar but not as pronounced.
The digital display does not show decimals. Depending on the rounding value you could be at 79.6 to 80.4 for it to show 80. Given the needle looks like 82, you could be about 80.4 on digital and be just 1mph off.
Not exactly what I would call an issue but I know what you're saying.

Because of the unnecessary redundancy, I decided that two units of measure on the display was silly so never used the digital display.
Reply
Old Jan 4, 2023 | 02:07 PM
  #7  
dantrigg's Avatar
5 Year Member
5 Year Member
Liked
 
Joined: Aug 2017
Posts: 83
Likes: 27
Default

Originally Posted by zebvance
Speedometers are unmatched. Digital is 80 and gauge always shows more then digital.
There will almost always be a difference between an analog and digital gauge for two reasons. Why?

1) There are, for example, speeds between 80 and 81. The digital gauge is displaying speeds that are rounded to the nearest mile per hour where the analog gauge is not rounded. It displays every speed between 80 and 81. The analog gauge has the potential of being more accurate than the digital gauge. Considering wear and the variation of the air pressure in your tires as you drive neither one is completely accurate.
2) Perfect electrical components that are required to do the Analog to Digital or Digital to Analog conversions don't exist. There are going to be manufacturing differences (tolerances) of some degree in the components that are used to convert analog to digital or digital to analog. There are going to be manufacturing differences (tolerances) between different analog gauges. All of the tolerances will add up in a random fashion so that one truck will read slightly different (randomly) from another even if they are both running at the same speed.

Is it annoying? Only if you let it be. I wouldn't worry about it.
Reply
Old Jan 4, 2023 | 02:13 PM
  #8  
Dan Texas's Avatar
5 Year Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2018
Posts: 240
Likes: 105
Default

One would assume there is one speed sensor, and the analog gauge is electrically driven. I wouldn’t be surprised if there was an adjustable correction factor the truck applies, like I believe there is for the MPG calculation. Perhaps it can be tweaked in forscan?
Reply
Old Jan 4, 2023 | 02:16 PM
  #9  
dsg2003mach1's Avatar
5 Year Member
10 Year Member
Photogenic
Photoriffic
 
Joined: Aug 2012
Posts: 3,010
Likes: 922
From: Central FL
Default

Ive seen a few vehicles like this, using the GPS on my phone the digital dash was usually correct, never tried to correct any of them
Reply
Old Jan 4, 2023 | 02:42 PM
  #10  
eyecandynsx's Avatar
5 Year Member
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 2010
Posts: 2,920
Likes: 1,870
From: Central PA
Default

My 2019 is this way. Bugs the **** out of me.
Reply



All times are GMT -4. The time now is 04:45 AM.