Well, I guess this needs to be discussed again.
First and foremost, if you know what you are doing with the tune on these cars, you don't need to datalog after you've developed your tuning. Why? Because by tuning the correct parameters in the car, the ECU controls everything. Now, if someone were adding boost lets say, and doing it a way that worked, but the ECU's logic was fighting it because it wasn't the right way, of course you would need to log it to get things under control because you are making the ECU do something it doesn't want to do, and then since it was fighting an "error" it would react differently on every car based on where it is at climate, and elevation wise.
This is why we tune a certain way, and why we only log when in our facility, under controlled situations. This way we can simulate conditions, and do everything hands on.
Now, getting back to winter blend fuel, and changes in fuel from location to location. If you are tuning that on the edge that it is requiring different tunes, then you are really walking a fine line.
We would never tune something that on the edge that a slight change in fuel would impact it. Even if it did, we leave all of the safeties on to help protect things as much as possible, just like the OEM does. And as mentioned, Ford doesn't have you running around trying to help them get your car running as it should, and neither do we.
Having a complete understanding of the way these engines, and their control systems work is what allows us to run faster than "logged" tunes, without ever seeing a log, or the car. Our custom tunes we send out the first time, do what they are supposed to, and outrun cars with more boost, more timing, more mods, etc, etc.
So, no, you don't need to log, you don't need to worry about logging, and you definitely aren't going to blow up your car from not doing so.
