Performancas was referring to 87 Octane = 95 RON or whatever the Euro/Asian fuel octane rating calculator is called.
He would have topped even the top gas pump Octane rating fuel for Canada, which I know to be 94.
Aircraft and race track fuel stations need not apply ....
I know the 4g15 loves to sound pingy up top under load, and putting on the 4g37 parts means you have different timing curves and loads points, so the motor is being worked differently.
Even if you cleaned your piston tops and combustion chambers, it might not make a big difference.
If for some reason, we were thinking that the EGR system was plugged or not functioning properly, I could see combustion chamber temps staying higher and carbon bits glowing being a point of soreness for the user listening to the ill effects of heat on a motor that runs excessively hot compared to other 4 cylinder designs. These seem to be some of the issues that I read about over time when owning and dealing with during my time of ownership of 2 4G15's, one of which had the 4g37 gear on it.
The clicking from the dash is likely from the ECU shutting down the engine as the MPI relay gets triggered on and off due to leaking capacitors on the main board, causing this ill effect. I've been left stranded from just such an instance with a 4G15 within a few short months of ownership = also the reason I learned how to track down the electrical gremlins related to this issue. Also my 4g61t would cycle the MPI relay due to severely leaking capacitors on the 90 Eprom board that was running the car.
Check out that main board ECU!!