Quote:
Originally Posted by shiv@vishnu
It doesn't. Mike is saying that extra boost results in knock activity which causes the ECU to drop timing and adapt accordingly. The "quality" of this adaption is what is in question. His statement that this knock/knock retard relationship suggests that any tune can claim "timing control" only makes sense in the mind of a infomercial pitch man.
Shiv
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Agreed - i am not a fan of using the knock retard function to control timing. Although its not a N54 i have observed that on Z32's if you "ride the knock control system" the engine does fine for 10 - 15 k miles but slowly starts degrading over time. You see this in the form of frequent plug replacement and eventually exhaust valve erosion and lack of compression. I feel that something similar might happen on this engine, we are simply not seeing the bad effects yet but over time there will be a price to pay.
Harry