Chrisco said:
No, you're an example of why toyota engineered the supra's ECU to pull massive amounts of timing when the knock sensors start going crazy from detonation.
Supra runs fine though so I don't really see your point.
Higher octane fuels only reduces the risk of ping; doesn't ensure it. What you're saying is that using 87 octane will certainly lead to the destruction of 7mgte engine, but that hypothesis clearly does not hold completely true; otherwise my engine SHOULD have blown after 8 continous redline races at 15 psi(or at the least showed some mild case of the bhg). If timing was MASSIVELY pulled, I also should have lost to my friends WRX, however, I managed to win by several cars. There were minor backfire's during the race while shifting which I "thought" was detonation, but it was because the engine ran too rich in between shifts due to my atmospheric BOV and the ECU dumping fuel.
So for you to condemn me for using 87 octane is completely absurd. Of course it is always best to use the highest grade fuels, but I'm just saying in my case it wasn't necessary.
Obviously cases vary, just because I can use 87 octane and be fine doesn't mean your car can handle it. There are many factors that will allow certain fuel grades to be sufficient such as altitude, temperature, cooling efficiency, and fuel purity. Ex: The effect altitude has on engine compression. Increased compression mean increased octane, but other things can offset the requirement as well such as the outside or engine operating temperature.
Enough said, I'm sure you get the point.