I use 93 with Lucas upper cylinder lubricant. I may as well run leaded high octane gas. Still I just put in the engine, that's a $7,000 hit if it blows.
The knock sensor just retards the timing in the event of bad gas. Listen for a ping, run good gas, or if you are paranoid about not having a sensor retard the timing a few degrees.
Most cars nowadays don't even have knock sensors.
I'm running 12.7:1 CR, knock happens no matter what. It's the bad kind of knock aka pre-ignition that worries me. The sensor is failing, and it cuts power to the car, it's annoying to drive, and I don't want to damage my $7k engine. I also don't have a way to set timing, I'm running the factory ECU.
12.7:1? What motor? Honda? That's a lot of compression out of a factory type gas motor. It can be done but you need to have the chambers polished and a lot of cooling. The knock sensor is probably not bad , it is probably reacting properly! Throw some e85 in there and see if you get your power back.
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