So...... I checked my local E85 content and it has been 70%, crap e85. Haven't had any problems recently until a few days ago I logged all the way home and had knock 3* on cyl#2 and #3 on a 4th gear pull at 5000rpm and above until i let off at 5800rpms due to traffic. The car has alky/water injection 50/50 and running e47, didn't honestly think knock would be a problem at 22.5* timing and 24.5psi.
Side note, before all of this happened, it was full 85% so now I have been taking a little fueling out due to the lower e85 %, about 7%-8% less on the injector constant, this got the fuel trims good again.
Today did another log and it knocked again on only one cylinder as shown below. I even lowered timing to 21*, still pissing me off, it never knocked before at high rpm like that and it has me nervous. Any suggestion? Could it just be shit gas?
Heres my log from a week ago on a more aggressive tune, same gas: