13.5 compression ratio LS7 that will run mostly on E85 but would like to be able to also run 91 if I cant get E85 when I need it.
So the question is:
Can I use a flex fuel sensor and run a high octane timing table for the E85 and then use the low octane timing table for the 91 octane?
2006 E38 ECM is being used
The E38 should have a gas and alcohol spark correction table. So you can use those tables to add in spark based on the alcohol content in the tank.
You can't make the high/low octane table work separately like you said.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
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