Speed Calibration

[bemcknightsr]

I have the intune i3 platinum and cannot get the speed calibration correct. I have a 2016 Chevy High Country with 35x12.50x20 tires. I have input 34.5 all the way to 36.5 height for tire as well as the sidewall tire size. It still has me on avg of 18mph over the actual speed. Any solutions to fix this issue.

[mikel]

is it as if the change is not taking effect at all?

[06MonteSS]

Do NOT go by the sidewall sizing.. you need to actually measure your tire height, from the ground to the top of the tire, and you'd use that inches amount to set the tire height/diameter...

so then you'd go to Tune Vehicle - Advanced Mode, and select the ECM tune to install.. then choose to Modify the tune... then go to Speedo correction menu, and then adjust the tire height/diameter setting.. then exit back out, and then install/apply the tune..

that will re-install the tune with your tire size adjustment in it.

as long as it's within 0-1 mph compared to a GPS, you're fine and good to go.

Very important to adjust the tire height/diameter setting so that your speedo is within 0-1 mph compared to a GPS, because tranny shifting/shift points go by MPH - so if your speedo is off, then tranny shifting will be off too...

[bemcknightsr]

that's what it looks like

[bemcknightsr]

06MonteSS: thanks i will try measuring today

mikel: seems to be that way that it does not take what i input

[mikel]

make sure you are entering the new size, saving the change then backing up and applying the tune to the vehicle.

if so, make the change and post a copy of the last tune written file here so we can check it out.

[bemcknightsr]

"D:\runtime\GUI_runtime_202666665_4.dbg"

[bemcknightsr]

06MonteSS
I tried what you suggested still getting the same results

[mikel]

an you post the last tune written file please?