Datalogging the Knock sensor?
#1
Three Wheelin'
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Location: Gulf Shores, Alabama
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Datalogging the Knock sensor?
What is the output of the Knock sensor? It is within 0-5v? The Zeitronix has an auxillary input for datalogging, so I was thinking of wiring it in, if its output is between 0-5v and it would be able to be interpreted.
#3
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According to the AEM stuff I was toying with, the knock volts were a range between 0-5v. Not sure if this is the raw voltage or after filtering / conditioning, but the software graphed kock volts in this range.
#4
I tried it with the Zeitronix datalogger and got just 0.2 volts when banging on the block next tot he sensor. I now have a toggle switch on the dashboard to switch between fuel computer output to DME and a steering wheel mounted pushbutton to provide a spike (ie: at the start/finish line and another marker) so that I can relate data logging to particular parts of the racetrack.
I use Knocksense for knock monitoring but can't log it.
I use Knocksense for knock monitoring but can't log it.
#5
Three Wheelin'
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I now have a toggle switch on the dashboard to switch between fuel computer output to DME and a steering wheel mounted pushbutton to provide a spike (ie: at the start/finish line and another marker) so that I can relate data logging to particular parts of the racetrack.
I've got a knock display, but I also wanted to be able to datalog.
#7
You have to be carefull with the type of nock sensor you are using. There are two type of sensors, the Broadband Resonant type and the Flat Response Type.
In summary the Broadband Resonant produce a higher output voltage that can reach up to 2 volts but it is tuned for a narrow frequency range. The Flat Response type produce a very low output voltage up to 30mV but it is tuned for a more large frequency range. In my opinion the knock sensor used for the 944 and 968 series is of the Flat Response type. When I installed my Tec 3 in my 968 Turbo conversion, one of the knock sensors was replaced by the type supplied by electromotive for correct operation. Check the logger owners manual or contact them to see what type of knock sensor has to be used. Hope this help.
In summary the Broadband Resonant produce a higher output voltage that can reach up to 2 volts but it is tuned for a narrow frequency range. The Flat Response type produce a very low output voltage up to 30mV but it is tuned for a more large frequency range. In my opinion the knock sensor used for the 944 and 968 series is of the Flat Response type. When I installed my Tec 3 in my 968 Turbo conversion, one of the knock sensors was replaced by the type supplied by electromotive for correct operation. Check the logger owners manual or contact them to see what type of knock sensor has to be used. Hope this help.
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#8
Originally Posted by Claus Groth
I use Knocksense for knock monitoring but can't log it.
#9
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Originally Posted by Claus Groth
I tried it with the Zeitronix datalogger and got just 0.2 volts when banging on the block next tot he sensor. I now have a toggle switch on the dashboard to switch between fuel computer output to DME and a steering wheel mounted pushbutton to provide a spike (ie: at the start/finish line and another marker) so that I can relate data logging to particular parts of the racetrack.
I use Knocksense for knock monitoring but can't log it.
I use Knocksense for knock monitoring but can't log it.
Edit: And that looks like a sweet little device. What do you think of it so far?
#11
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Originally Posted by BoostGuy951
Yeah, but the question is are you gonna be able to interpret it.
#15
Three Wheelin'
Do a search! Im still working on a device that recognizes a filtered knock, but have been delayed due to running issues. Hopefully by spring I will get my shi@ together.