| the BMW is direct injection so.... You can delay the actual fuel injection time to the very last moment before it reaches TDC. That reduces the time it has to preignite and cause detonation. Another reson is that the fuel atomises better than port injection because its injected at a higher psi (over 1000 psi using a mechanical pump) and because it hits the super hot piston cooling it and vaporizing at the same time . Since the fuel injection timing is independent of the valve opening event it allows more optimum and precise fuel injection so you can run it leaner than the usual turbocharged setup without detonation. Direct injection has many advantages over conventional port injection, all of which make it super efficient. Its only a matter of time before the aftermarket catches up and introduces direct injection. BTW BMW uses some methord to measure the ionization in the combustion chamber which tells them if detonation is imminent and it retards timing to compensate BEFORE detonation occurs. This is far superior to using a knock sensor which can only measure detonation after the fact. Harry
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