Tire size recommendation?

[Superspirit]

Yes, you can correct the speedometer with forscan however it will set a communication code as what we can set doesn't satisfy the pcm. My speedo is correct and the code doesn't turn on the light so without a scan you'll never know it exist's

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[Dean]

So to make sure I understand you...

You mean you have corrected circumference with Forscan, The computer did not like changing it, but accepts the change and sets an error code, but no "check light" turns on, Correct?

I guess the dealer wants to know if the user changed tire size.

While this is needed to get correct speed reading I think it may also impact ABS functioning as well... although to a lesser degree.

 

[Superspirit]

The abs still works as intended. It's utilized a lot in trail control mode and I use that all the time out in the fields chasing birds.

And yes you are understanding it correctly.

 

[MrBusses]

Yes I changed my tire size with forscan, it does set a code for invalid data from the bcm but won't set the engine light so nothing to worry about.

It has nothing to do with the dealer knowing you changed something it's just how the modules talk to each other

 

[DukeCanBuildit]

So to make sure I understand you...

You mean you have corrected circumference with Forscan, The computer did not like changing it, but accepts the change and sets an error code, but no "check light" turns on, Correct?

I guess the dealer wants to know if the user changed tire size.

While this is needed to get correct speed reading I think it may also impact ABS functioning as well... although to a lesser degree.

I went up in size but did not calibrate the speedometer. I’m out by about 5%. At 95 km/hr on the speedometer, my GPS says I’m going 100 km/hr.

There is a good and bad side to this.

Good:
For every 95 kms registered by the truck’s systems, I’ve actually covered 100 kms. It’s like a very small extended warranty but I always time out on my warranty anyway. Total kms at resale read as lower than actual.

Bad:
My truck doesn’t accurately calculate my fuel consumption. If I burn through 12 L of gas in 100 kms as per the odometer, I really burned through 12L in only 95 actual kms driven or 12.6 L/100 kms rather than 12.0 L/100 kms. Overall fuel consumption at resale reads as higher than actual.

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