2014-15 vs 2016+ Corvette LT1 cranking Eq Ratio

Why do the 2014-15 LT1 Corvettes have such a big difference in their cranking eq ratios?

My 2015 C7 M7 Z51
Attachment 145756

2016 C7 M7 stock file from Evan's Performance Academy
Attachment 145757

Doesn't look like the 2016 file is actually stock or it's a one-off. My 2019 file matches the 2015 values.
Attachment 145761

Quote:

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Originally Posted by 96GS007

Doesn't look like the 2016 file is actually stock or it's a one-off. My 2019 file matches the 2015 values.
Attachment 145761

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I download stock tune files from the tune repository for 2016-2018. The 2016-2017 files match the one above from Evan's. 2017 was an auto everything else is M7. The 2018 match our files.

I wonder why 2016 and 2017 are different.

Quote:

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Originally Posted by DobermanRacing

I download stock tune files from the tune repository for 2016-2018. The 2016-2017 files match the one above from Evan's. 2017 was an auto everything else is M7. The 2018 match our files.

I wonder why 2016 and 2017 are different.

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I tried looking around and I go nothin' Sometimes GM is mysterious and changes things seemingly for the sake of change :shrug:

these kinds of changes are probably emissions related