Quote:
Originally posted by lx mike
I don't think it works like that! 
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It works exactly like that. That is why a boosted motor requires less compression. If your motor is 8:1, every psi of boost equals just under one compression point. So if you add 15 psi your are damn near at 20:1 for compression. So, now if you take a 15:1 motor and add 15 psi it will have high enough compression to be a deisel motor which means detonatoin very easily at that high of compression. Now all of this is just the basic idea. How well an engine flows will also effect how much compression boost is actually adding. Spark timing also will play a huge role in this too.