Yeah, GM's have some interesting knock situations. It's been said that some noises cause the knock detector to go off and the timing gets pulled.
I know on earlier cars (my old Typhoon for example) there were some people that were capable of adjusting the fuel and timing tables really well by flashing new proms (old technology I know).
I just don't think there's that much more power lurking inside these engines. If we lean it out too much it's just going to get really sensitive to knocks not to mention the safety margin of running rich (which comes into play in our hot AZ summers). ECM designers have been doing really nice work lately in designing systems with built in safety margins without sacrificing much power. Not to mention if we start messing around too much we could screw up the driveability of these trucks.
If we were forced induction, that'd be a whole different story. But for a NA car it wouldn't be too useful IMHO.
The Ford system is interesting.
Take it easy,
Alberto
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