OK, I just installed a flexfuel sensor on a 2006 GTO and verified that it is working. Now I understand how the flex spark tables work but the fueling has me a little confused. I think what needs to happen is I change the Stoic AFR table under Engine>Fuel>General>Stoich AFR. Then the commanded PE AFR will be the Stoic AFR value for the percent alcohol I am running divided by the EQ ratio. Now, I am confused by the blend factor table in the Open Loop menu. Why would I need to use a blend factor based on fuel composition for Open Loop and PE if I already have stoich dependent on fuel composition? Also, in the PE menu there is only an EQ ratio for gas so I am assuming changing that stoic table will take care of all the fuel addition I need to run E-85.
Also, I plan to leave timing alone to begin with so I have zeroed out the Flex Spark table so nothing gets added or subtracted. Is this a bad idea? Seems like I would want to dial in fueling and then add spark if needed.
Thanks for your feedback.