i've been finding a lot of this info.
The TEC and HPV-3B products make use of a piezoelectric microphone that is especially tuned to pickup engine vibrations created by knock (also called detonation or ping). The sensor has a 3/8" NPT thread for attachment to the engine block or cylinder head. Above approximately 5000 rpm, however, this knock may be masked by mechanical noise; Electromotive calibration software allows the user to program an upper rpm limit to disable the sensor.

It seems that most GM sensors suck above 5000rpm, and therefor give no indication of knock for most honda applications. If i'm boosting a d16a6 how the hell can I tell if there is knock when I rev it up to 7500, if the knock sensor is designed to resonate the piezoelectric element below 5000rpm?

 

If it's detonation or rod knock, you can usually hear it anyway. Why exactly are you running the knock sensor?

 

Well i'm getting the R-500 wideband logger from PLX, and they've got a sweet knock reader built into it, and it will tell you what the knock sensor is reading. I'm going to be tuing the car myself, and if there is knock, I want to know about it, so i can adjust the timing to get rid of it. So I gotta get a GM, or bosch, or aftermarket knock sensor, to hook up for the PLX logger to read.

 

Just wanted to throw this in here, don't know if it will help:

http://deviantmethods.com/bigmoose/pages/knock.htm

 

Damn, that's a lot of jargon. I did take physics and chemistry in college, but that got a bit too technical for me. It looked like the "flat" knock sensor from porsche and the other one didn't even do anything. And arroding to
http://www.pgmfi.org/twiki/bin...uency

I should be aiming for around 7.6 khz, and a b18c1 is around 7.0khz,
so why was the b18c1's knock sensor resonating around 12.5khz?

 

From what I have gathered, you don't want the sensor to resonate. When it does, it's generating a false signal from within the sensor itself, as well as "ringing" which may mask other detonation events. That is the reason some cars use the "flat response" sensors pictured on that page.

 

btw the honda knock sensor doesnt work above 5k rpm eitehr sicne the valve train makes enough noise to make it worthless then too.

In your case i would rely on a dyno to find knock....

 

How does the dyno find knock? Jummps in the power of the car at certain rpms?