Well, you CAN have both on the chip. It's not good practice though because if you accidentally hit an up or down button too many times and switch the hex code when the engine is running and while everything's powered-up, the engine can die or keep running with messed-up parameters for that key cycle which is not good.
For instance, if you want both calibration families on the chip, put one set (say VRAA7S6) on positions 1-4 and do not go past that with the engine running. Then put 5-8 (or whatever) as the VRAA6S3.
To change between the two, the engine has to be off but the key in the run ("on" position). To switch from the 1-4 set to the 5-8 set:
1. Stop the engine
2. Turn the key to "run"
3. Change switch position to "05" (or whatever position starts the other set) and wait for the confirmation blink. Your wait to start light may flash and you might hear a click. Normal.
4. Turn the ignition back "off".
5. Restart the engine normally.
Use the second set of calibrations as you normally would. Switching on the fly is fine. Just don't go to the other set (1-4 in this case) while the engine is running and especially while driving. To switch back to the other set of hex code calibrations, repeat the above steps.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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