| that detonation detection isn't as cut and dry as one may think when using a piezo-based sensor. The ideal means of detection would be to use a pressure sensor within the combustion chamber to detect sharp spikes in cylinder pressures - normal combustion occurs over a period of time and the rise and fall of cylinder pressures looks similar to a "bell curve" whereas detonation produces sharp spikes in pressures as the air/fuel mixture spontaneously ignite all at once. The most reliable means to tune a vehicle and avoid detonation is to dyno tune the car and find the threshold where detonation begins, pull back the timing a little, drop the boost a psi or two, and know you've buffered the tune enough that even in the worse case scenario it wont detonate. Relying on the OE sensor to handle this is futile - I've seen many engines that have suffered from severe detonation which if the knock sensing abilities of the existing system were sufficient, would have been avoided. In essence, dont rely on the knock sensing system in our cars - be smart about it and tune the car accordinly and keep the boost within safe limits.
[ ashspecz.com ]
[ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving.
Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor.
Albert Einstein
|
