Buzzbomb

Is there currently any way to monitor the stock Honda knock sensor on Uberdata run OBDII vehicles?

I was thinking about wiring in a red LED to the knock sensor so it would light up whenever knock is detected. I'm going to research this a bit, but wanted some other opinions.

I want to be able to help monitor knock to help me street tune the timming maps when I get my turbo kit installed.

beepy

Unfortunately the knock sensor is a very complicated device that takes either a computer or a human brain to decode. if you want to go the human brain route, you just need to hook the knock signal into an analog recording device or into earphones. The knock is an actual audio signal that you can easily detect with your own hearing, but which a computer has a hard time deciphering with all the background noise.

Don't hook it into your stereo, though. The noise your engine produces is intense. Knock heard this way sounds like marbles falling on a piece of sheet metal.

therealPROJEKTEG

blah, stock knock sensor's suck anyways. there's so much noise in the motor from the high revs and vtec, etc. that the stock knock sensor's become really inaccurate at higher rpm's. crome pro has knock logger to show how much the knock sensor is retarding timing, but like i said it's really not that effective.

Buzzbomb

So it's not an ON / OFF situation where the sensor sits quietly waiting for knock and once it hears it, it send a signal to the computer telling it that knock was heard?

If it's like you say, an LED won't do much of anything.

therealPROJEKTEG

i believe the knock sensor is a microphone type device, i'm pretty sure it doesn't even send a voltage signal, if that's the case, an led would be out of the question anyways. :: Puts on flame suit just in case::

Buzzbomb

Any other ideas?

EnzoSpeed

The knock sensor is a piezo transducer. It turns vibration into voltage.

Under normal driving conditions, the knock sensor creates about 1-2v which the ECU interprets as normal. When detonation occurs, the excess vibration causes a voltage spike and the computer will throw a knock code.

The knock sensor is very complicated. Its output voltage is constanly waivering depending out how you are driving and the ECU monitors the signal. The ECU determines when the voltage spike is considered to be engine knock. The whole system kind of works like a richter scale.


So, no, you can't use an LED. You need the ECU to determine what is and isn't knock.

BlueShadow

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Buzzbomb &raquo;</TD></TR><TR><TD CLASS="quote">Any other ideas?</TD></TR></TABLE>

I believe CromePRO has a knock logger.

http://forum.pgmfi.org/viewtop...9121a