Here’s a comparison of two logs, one below 20 degrees Fahrenheit, and one above:
17 degrees Fahrenheit:
View attachment 306451
32 degrees Fahrenheit:
View attachment 306452
-Red line shows gas pedal position
-Orange line shows throttle body position
-Blue line shows actual boost
-White line is the ECU’s perceived boost (I was running Map 1, +3psi over stock)
-Green line shows RPM, which also indicates gear.
-Yellow is MPH (I ran it to about 80mph)
-Left axis=PSI
-Right axis=RPM
-Bottom=Milliseconds
So after 2 years of deliberation, it appears Mazda is using the electronic throttle body to limit power in 1st and 2nd gear when temps dip below 20 degrees. The dip in throttle shown on the 2nd graph during 1st gear was the result of me forgetting to turn off traction control, and the tires spinning briefly (don’t put any thought into that, traction control has nothing to do with the sub 20 power loss). The first log was recorded with traction control off.