lost me with that last one. sorry.
When the gas ignites before it is supposed to, called preignition or detonation, it makes a certain knocking sound.
Basically, say you have an LT1. On these motors there is a special sensor that "hears" this exact knocking sound. Also, the distributor's timing advance is controlled by computer. That is how you can re-program timing curves by flash tuning the computer. If I remember, LT1s have a compression ratio of 10.5 or 11:1. Pretty high so you need high octane fuel. Now, say you accidentally put plain old 87 octane in there. In a 70's (for example) motor with that CR, you bet there would be detonation problems! On an LT1, however, the computer hears the knock detonation makes and retards the timing. In turn this can eliminate the detonation.
Why you think this can help detonation? Well, for simplicity lets use this example, even though it is NOT the actual distances! Say your spark plugs fire 1/4" before the piston is at its highest point when you use premium fuel. By the time it is at the highest point the burning gasses are forcing the piston downward. When you accidentally put the regular gas in it, the burning gas starts pushing the piston down while it is still going up!
So now you need the spark plugs to fire 1/8" before the piston's highest point.
An LT1 will change timing so the spark plugs fire at that 1/8", because it has the sensors, computer, and control to do so. MUCH better than any plain old 70s design can do.:yes: Basically the non-computer motor will keep firing at 1/4" and destroy your motor.
Hope this makes it easier instead of harder!
Now is probably a bad time to say there are exceptions to the rule though.