32" to 35" Tires - How to program?

[breezyxm]

I have a 2022 4-dr Outer Banks with Lux Package ( 32" P255/70R18 All-Terrain ) and just switched the tires over to Wildtrack stock tires ( 35" LT315/70R17 Mud-Terrain Tires ). I did try looking in other threads but was getting way to overwhelmed trying to find the answers.

I have FORscan, but before I start calibrating anything I wanted to ask a few questions, so I don't mess anything up (first time doing this).

1. Does anyone know the actual mm for the Wildtrack tires?
2. Do I only need to do the tire circumference or do I need to also do anything else since I have the Lux package? I saw some people had issues with their adaptive cruise control after changing the circumference on the tires.

Thanks guys in advance!

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[BudgetBronco]

This will not answer your question directly, but I think this is a better way to accomplish what you seek to do.

I think the best way to determine the new circumference value to use in FORScan is:
- Drive on the highway with the new tires at three different speeds like 55, 65, and 75 and use a GPS to see what actual speed is (for purposes of example here, lets say it is 61, 71, and 82)
- Calculate the ratio of those three readings (in this case: 1.109, 1.0923, and 1.0933)
- Take the average of those three ratios (in this case: 1.0982)
- Whatever value is in the as-built FORscan, multiply it by the average of the ratios (1.0982)

That should give you a really close result. Let me know if any questions and...GO PENS!

 

[breezyxm]

This will not answer your question directly, but I think this is a better way to accomplish what you seek to do.

I think the best way to determine the new circumference value to use in FORScan is:
- Drive on the highway with the new tires at three different speeds like 55, 65, and 75 and use a GPS to see what actual speed is (for purposes of example here, lets say it is 61, 71, and 82)
- Calculate the ratio of those three readings (in this case: 1.109, 1.0923, and 1.0933)
- Take the average of those three ratios (in this case: 1.0982)
- Whatever value is in the as-built FORscan, multiply it by the average of the ratios (1.0982)

That should give you a really close result. Let me know if any questions and...GO PENS!

Honestly never even thought that would be a thing! You really opened my eyes on this one.

Also awesome to see a fellow pittsburgher here!! You don't see a ton of them over here.

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