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power. You find its peak operating potential, dial in your boost guage, put some race fuel in, get your A/F level, then start jacking the timing and watching guages till you hear smack smack smack of detonation. Back off two degrees, make another run, watch EGTs. AT this point you have reached the limits of the parts and you can make no more power. If you try and spool the turbos more, you have more pressure, but the heating effect causes the density of the air to drop. This is what you see on a compressor map -this is the point where you see the efficiency drop. The turbo will produce the best power at peak efficiency. This is where the pressure, flowrate, and temperature produce the best mass airflow (or best usable content of air). Granted, engines operate in a band of airflow ranges but if you look on a compressor map that is tagged with a line that represents your engine's flowrate per RPM and boost, you will see what boost psi generates the best efficiency coverage of the compressor. This is your target psi. Going over it will not make more power, it will exponentially make less as you have to pull timing to avoid detonation and charge density falls.
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08:58:15 02/13/03
