Speedometer recalibration with IID Tool

[BriComp]

@Jimmy Brooks - I have the exact same config and used your settings - thanks. Curious, what do you run your tire pressure at? Assuming it is not the LR4 standards, also wondering if they can be changed in the TPMS.

 

[greiswig]

Here they are. My tire size is 265/65/18 so if your tire size is different this most likely won’t be accurate with your real speed.

View attachment 11798

Reviving this...

Is the "Tyre size - MSB" parameter the ONLY one I should be changing?

Also, you had changed it to 30, but from what? I feel like I'm reading conflicting messages as to whether that number should go up or down as the tire diameter goes up.

 

[BriComp]

Awh nope - size, width, rim size, and MSB - that 30 is an odd one that down is up and up is down. So when I changed mine this show prior to the commit.

 

[CRYA]

Awh nope - size, width, rim size, and MSB - that 30 is an odd one that down is up and up is down. So when I changed mine this show prior to the commit.View attachment 13139

So no change to Tire Rolling Circumference?

 

[BriComp]

Nope - did not touch / change. Just the parameters above. Interestingly many things changed once those settings were updated. Speedometer is dead on but the rolling circumference may impact something other than that.

 

[BriComp]

However, doing the math real quick I see for my tires the RC ends up being 2442mm (63360/659)*25.4. Got the rev/mile from BFGoodrich All-Terrain T/A KO2 Tires (tiresize.com). I may update that tonight and see if anything changes. Perhaps something like gas mileage?

 

[CRYA]

I just changed the original specs. Will check out and confirm with gps tomorrow. Thanks for the specs and images!

 

[BriComp]

Interestingly that rolling circumference can only go up 20 so not sure it is what it is. I plan to reach out to support and see if they know...if I can remember to do so. In the mean time I changed mine to 2385 to see what if anything it impacts.

Sent from my Pixel 4 XL using Tapatalk

 

[BriComp]

And GAP tech support said "The value does not reflect a direct measurement.

Menu--Car Config--Instrument Pack--Tyre Size MSB - IPC

Is the correct setting, others don't work"

 

[CRYA]

Yeah I received same somewhat fuzzy response. Anyways, your settings have my Waze speed and digital speed dead on.