Originally Posted by MACDRIVE
Ok I have a bunch of questions:
Are you guys equating Knock Reduction with pre-detonation? Because it seems to me that pre-detonation would be the ABSENCE of Knock Reduction. Am I wrong?
What does a pulley change and fuel pressure have to do with pre-detonation?
Finally, why is the original poster trying to find all kinds of engine parts to sustain the onslaught of pre-detonation, rather than just eliminating the source of pre-detonation in the first place?
The PCM can only retard timing a certain amount. From there, you blow up if you continue to knock and detonate. As in the case of this topic'* author. Series 1 only has a single knock sensor as opposed the two in the S2. This means if the sensor fails, you might just go boom.
Smaller pulleys produce more boost pressure and heat. Heat causes detonation/knock. Colder plugs, porting, headers, etc can all help reduce it after the pulley change. Fuel pressure is two-fold. You need to keep up with the fuel demands under full throttle, because a lean condition can cause BOOM in forced induction. In addition, the fuel can have a cooling effect in the cylinder. This is why we run full rich under WOT conditions by design.