Looking for a little help here. Car is a 2009 CTS-V M6. Only changes since last tune is a cam swap and clutch. Motor had to come up, but shouldn't be related.
It's full bolt ons on flex fuel with a cam. The issue I'm seeing is timing just not adding up based on what I'm commanding. I've turned off most tables that pull timing with the exception of IAT. Hi/Lo octane tables are copied. Flex fuel you will see in the logs commanding a 5.5* advance. I am statically retarding cylinder #5 2-5* across the band due the knock sensors indicating it needed for whatever reason. Not rare on these cars from what I understand.
I was seeing 16-17* under boost when it should have been in the 19-21* range based on almost same tune with prior mods. It dropped down to about 13* when I made an adjustment to the IAT spark multiplier. Set it all to 1. Something I simply missed in the past.
6:51:43 in the attached log I get 12* advance total at 5600rpm. Should be 16* base + 5.4* flex fuel advance - 5* IAT retard. So about 16*. I'm obviously missing something. Logs attached. Appreciate any help.
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