Updated: Jun 28, 2021
We have answered this question more then once this week, so it's about time we talk more about calibration tools. The short answer if you're even asking, is yes.
With us, you will typically hear us refer to them as a Procal or Flashcal. These are the brand names that we work with, but there are plenty of others out there. The AEV Procal is Jeep specific while Superchips Flashcal covers other Ford, Chevy, Dodge and GMC trucks.
What many don't realize when building out your overland vehicle, is that anytime you up your tire size, usually above 33's, re-gear, or even sometimes just add a lift kit, one of these calibration tools is needed. These are programed specifically to your vehicle, so once you have it, you have it.
But here's why you need it:
Correct your speedometer to account for the new rotation rate of tires and gears. This is more important when you think in terms of your stability control. If your vehicle thinks your tires are going faster then they actually are around a bend, it can trigger something like your traction control because it thinks you're skidding. Trust us, this is not something you want to test on the highway on ramp.
Reprogram the Tire Pressure Monitoring System to larger tires that would typically trigger a dash light.
Read and Clear trouble codes
And the Procal specifically:
turn on or off the Daytime Running Lamps
Activate or deactivate the Automatic Sway Bar System (certain models only)
Activate the One Touch Lane Change features
Increase your idle speed, which is particularly useful when winching.
Help to center the steering wheel
So any time you are thinking about upgrading tire size or re-gearing your vehicle, remember you will need one these calibrators. Without it, your trucks computer systems simply won't work correctly or efficiently.