This is what I like about Unleashed over LMS. You can data log. You cant with the Mycal. I don't know why LMS chose to work off the Mycal/Hypertech device. I'm not taking anything away from LMS, I run their tune in my 13 F150 EcoBoost and absolutely love it. I bought a SCT X3 so I could data log. I don't care what anyone says. I wont to be able to know what is going on and make sure the tune is safe and running like it should.
There are quite a few things that people like to "log" or monitor that are not accurate. For instance, let's keep it rather simple. With the ever-infamous AFR....
EcoBoost vehicles do not run or even calculate afr. The calculations that you see on your dash or monitoring device are an estimate based on calculations of over 200 different tables! They are not MAF vehicles...the MAP sensor and wideband O2 sensors keep everything in check on-the-fly. We add onto the factory logic calculations to increase efficiency, power and accuracy.
You can monitor and log back and forth, but you have to know what you are logging and monitoring.
What AFR levels are you logging?
What fuel are you using?
How have you determined that your targeted air fuel is actually correct?
Lambda is how we and your ECU both see fueling.
The issue with using AFR is that you are using a pre-calculated value that is usually a compounded equation of incorrect data. What conversion is being used?
You can see where one simple item like "AFR" is now a likely source of incorrect data. All of this still leaves out the other factors that will alter said equation, like boost for instance. You see, the Data points that almost all dataloggers use are SAE. Now, SAE standards are nice, BUT they are not designed for someone to do calibration from. They are for repair shops to help diagnose issues with vehicles. So, the level of precision, and refresh rate is not what's needed to do proper calibration development. If you are using a data point with a 200ms refresh rate, but the actual value in the ECM refreshes every 8ms, then the ECM is updating 50x more frequently than what you are watching. Again, you start to see where the issues happen and it's easier to understand why we do not treat the EcoBoost like any other engine before it.
Can someone get lucky and eventually end up with a tune that works by looking at the wrong data? Absolutely. Can they repeat those results over and over again without starting from scratch each time? Usually not. And it all stems from having the right knowledge, and data in the first place.