Spark questions

[Mercilus]

I have a 2017 mustang 3.7L has 52# injectors on e85(measured e90). I have adjusted spark across the mbt and borderline tables however the knock sensor is adding more timing and hiting the pre ignition table since its the lowest. I have not adjusted it from the stock values. Should i raise the pre ignition table?

[decipha]

you should not have to increase the mbt spark table

yes you can max out the pre ignition spark table to null it

[Mercilus]

Thank you. So just increase borderline tables and leave mbt tables stock?

[Thatwhite5.0]

Max the Pre-Ignition table out, 63.5 the whole table. MBT has different timing on fuels with different stoichs and octanes.