2024 F150 XL Wheel Upgrades

[Bcat278]

Hi,

I have a base F150 XL with the 17” steel wheels. I want to swap out for the factory 20” wheels sold on the higher trims. I did the calculation on tire comparison and the wheel speed will be off 3mph at 70.

Has anyone does this on their truck? I heard that the truck automatically adjusts the speedometer since the dealer can no longer do it?
Would this pose a problem with the transmission shift points? I’m asking because the truck is 3 days old and I’d rather not risk damage to the transmission.
Please help!

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[fordtruckman2003]

Never heard of automatically adjusting to tires.
If that is case that opens up options for me with my 20".

Forscan can do it, and I was under impression dealers can do it too.

Someone here had XL rims powder coated and it actually looked pretty good.

 

[jasonkosi]

I put larger tires on my 24, did not ask the dealer to recalibrate the speedo. Haven’t gotten around to borrowing a cable to Forscan the change myself. For what it’s worth, I have over 10,000km on it already and no issues with the transmission or shifting. Calculation states 2.5mph off at 70 for mine.

 

[HammaMan]

Never heard of automatically adjusting to tires.
If that is case that opens up options for me with my 20".

It should be able to do it based on GPS, but that'd make too much sense.

 

[fordtruckman2003]

It should be able to do it based on GPS, but that'd make too much sense.

I can see that going well at a traffic stop. Satellites said I was doing 35 officer not 95. ?

 

[HammaMan]

Because the truck has a modem, it's capable of getting 2" GPS accuracy. The ground stations are everywhere. It's likely only got a 1hz capable receiver but that's plenty combined with the corrections from a ground station. Between the ABS counting wheel revolutions and the GPS accuracy, it's capable of very precise speed measuring especially while cruising at a fixed speed and can use that data to program the truck's tire size precisely.

The receivers in the latest dragys are 20hz which can sample your position 20x per second combined with ground station correction (DGPS) makes for a hyper accurate position making their data accurate to 3/100ths of a second for acceleration / distance runs (also has onboard accelerometers, as does the truck).

This level of accuracy allows nav system to see exactly what lane you're in too -- they just need to utilize it.

 

[Calson]

The difference is less than 4% and with a 10-speed transmission the change is easily accommodated. On a steep grade the transmission may be one gear lower but that is trivial.

The lane assist is 100% optical and not using GPS - thank god. Maximum GPS accuracy and normal acccuracy are quite different and the farther north one is driving the fewer satellites are available for any GPS receiver.

The odd thing was that the feds provided a less accurate signal for civilian use in the misquided thinking that a Soviet missile would use the U.S. GPS to navigate to its target. During the first Gulf War of the United States the tanks lacked GPS and so the military bought up every available civilian GPS device in the country and shipped them to their tanks. So the signal had to be accurate for the civilian GPS units and after the war the feds decided to not go back to using a degraded signal. The one time somethiing good came from a war.

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