CharlieGSanD

<center><img src="http://www.jegs.com/photos/1218964.jpg"></center><p>i know that some fab work will be needed.

any thoughts?<ul><li><a href="http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=26719&prmenbr=76">jegs.com</a></li></ul>

Mike O.

Why not tap into the stock knock sensor lines?

4kq

Or better still use a VAG-Com for the dual sensors, and you can see what is happening in the logs.

Mike O.

I thought there were 4 sensors

xr4tic

one between 1 and 2 and the other between 3 and 4.

Since two cylinders don't fire at the same time, you can have one knock sensor for two cylinders and still know which one is knocking.

xr4tic

just run the tap into an op-amp, then into a simple bar graph display.

It's just a matter of finding out what voltage is equal to detonation.

Audiboy

and to fancy it up, use a latch for memory (or 555 timer) otherwise, one may not see the LED "blip"

Mike O.

Ahhhhh...is that how the VAG-COM can recognize four knock channels?

CharlieGSanD

it uses the cam sensor as a refrence

CharlieGSanD

the voltage is just the volume/loudness of the knock...........

the ECU "listens" through the knock sensor for a specific frequency, (iirc 5-8khz) and detirmines a knock from backround noise through a filtering system. i would have to tap into the ECU after this system, (if even possible) to get a signal line...PITA! ;P