2015 Silverado with huge tires/gears and traction control issues. How to adjust?

[uni48]

I changed the roll out on the tire and got the speedo correct but the truck still activates traction control especially when turning. I noticed that there is no tire/gear calc on the 2015 truck.


1.hpt

[veee8]

Stabilatrak issue

[zippy performance]

Change the gear ratio in the pcm, but don't change tire size. This is a common issue to people new with tuning. The problem is the front tires are being read through the ABS module and the rear tires and read through the ecm/tcm. Unless you've figured out a way to change the information for the front tires what you're doing is correcting the rear so it reads right and doing nothing for the front since we have no access to that and wouldn't anyway for an truely big tire. This makes is so the rear tires now report correct speed and the front tires report incorrect since they aren't change and the abs module see's that as a fault which trips traction control and stabilitrac. The only thing you can do is correct the gear ratio and deal with the speedo not reading correct by leaving tire size alone in the tuning unless you are ok with the abs and stabilitrac not working.

[ElecTech]

Change the gear ratio in the pcm, but don't change tire size. This is a common issue to people new with tuning. The problem is the front tires are being read through the ABS module and the rear tires and read through the ecm/tcm. Unless you've figured out a way to change the information for the front tires what you're doing is correcting the rear so it reads right and doing nothing for the front since we have no access to that and wouldn't anyway for an truely big tire. This makes is so the rear tires now report correct speed and the front tires report incorrect since they aren't change and the abs module see's that as a fault which trips traction control and stabilitrac. The only thing you can do is correct the gear ratio and deal with the speedo not reading correct by leaving tire size alone in the tuning unless you are ok with the abs and stabilitrac not working.

Couldn't you just enter the "effective" gear ratio (tire size and gear combined)? That value can be entered into gear ratio and it should correct everything. Maybe?