Quote:
Originally Posted by viprez586
So i tried everything, torqued at 14ftlbs, different locations, its own personal ground for the casing, race gas.
I would get phantom knock while in neutral free-revving with hard throttle stabs and when i would go WOT.
What i tried, a metal washer in between the sensor and the block: Actually made it more sensitive( maybe trying different size thickness and diameter would yield different results.
Telfon tape on the threads: No difference.
Welding the hole on the inside of the threads (1gs): Slightly less sensitive, took harder throttle jabs to get knock.
Finally i decided to try a telfon washer(thickness of turbo bolt washe) between the sensor and the block, i know this has the possibility of deafening the knock sensor completely but i tested it before it went on the road.
Very hard quick jabs would result in about 18-24 counts of PK which was better than my previous maxed out 43.
So i figured okay lets give it a test, i kept boost as low as my spring can go(14.7psi aka 1bar).
1st gear i'd pull in the 12-20pk, 2nd-5th showed 0-3 counts of knock WOT timing at around 18-20 tuned at 10:1 AFR.
I'm currently in the works of testing this further, posting some logs, and more details to come. Comments welcome. I know its another damn thread about knock but maybe some greater detail of phantom knock will reduce the overjam of "why am i getting knock" threads.
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A teflon washer?
I recently was posting about using teflon tape on mines and setting it at a looser torque spec and most of my pk went away... But then again, I was getting no were near as bad PK as you mentioned.
The only problem I have with desensitizing the KS, is that you dont really know how much your desensitizing it by, and I dont want to not register real knock and not detect it, even though theoretically real knock sould be strong enough to carry thru some teflon washer/ tape etc.
Being able to tune your timing/ fuel helps a lot in attempting this in the first place since you should know what kind of tune is within reason for your motors longevity.
I think your 10:1 afr is way too rich though ( maybe it was just for testing purposes)
but ive found my car to get knock from going richer than 10.4 AFR when running any kind of boost/ timing. Not to mention the back firing; Read- "Rich knock"
That sounds good about your results though; definitly sounds like your acceleration will improve since your timing advance will be closer to their full values.
