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  • Detonation detection

    Not knowing much about figuring out if your motor is detonating, I've done so e research and it sounds like a microphone and headphones is the best way to do it.

    My plan is to follow an idea I read about taking a voice amplifier and extending the microphone and gluing it to a little battery clip so you can clip it to different parts of the motor and listening while it is running.

    I wanted to tap te collective wisdom in case that isn't the best or someone knows of a better/different way to do it.

  • #2
    there are schematics out there for doing that with the knock sensor that is already on the motor i believe. but i might be full of it, look around for...nevermind look at this thread

    http://www.starquestclub.com/forum/i...owtopic=127345

    lots of hits typing "knock sensor headphone circuit" into the googles
    I am SKULLWORKS

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    • #3
      I built one of those circuits and it didn't work well under load. I say rely on an EMS with a band pass filter to give you repeatable knock values.
      '18 Chevrolet Volt - Electric fun hatch for DD duty!


      DefSport Koni Sleeve and Spring Perch Buy!!!
      http://www.nissanroadracing.com/showthread.php?t=5902

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      • #4
        Interesting...

        Here is an article on the aem ems and knock sensors:
        http://www.enginebasics.com/EFI%20Tu...%20Sensor.html

        And here is the article that got me thinking about this:

        http://www.autospeed.com/cms/article.html?&A=0348

        The second part has the build instructions.


        I like the idea of what you linked to, Tower. don't you have to install the knock sensor? Or just T into the factory location?

        Really beneficial was the audio of the detonation. It didn't sound anything like audible detonation to the ear.

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        • #5
          Megasquirt has a knock detection system that's pretty good and fairly affordable:

          http://www.viatrack.ca

          KnocksenseMS is what it's called.
          1990 240sx - Aristo 2JZGTE, R154, GT37, Defsport Wilwood kit, KTS coilovers - daily driver
          1991 civic si - B18C5 / toda / ATS / hytech - autox
          2001 integra type R - Greddy td05-18g - garage queen

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          • #6
            I built that auto speed circuit, it didn't work well. It seemed like it had a feedback loop where it kept getting louder and louder. You could definitely hear the valve train noise at idle and light load though.
            '18 Chevrolet Volt - Electric fun hatch for DD duty!


            DefSport Koni Sleeve and Spring Perch Buy!!!
            http://www.nissanroadracing.com/showthread.php?t=5902

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            • #7
              I have one of these in my car

              http://www.linkecu.com/products/Tuni...s/knocklink_g4

              Pretty foolproof and by all reports very reliable.

              Sent from my Nexus 4 using Tapatalk

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              • #8
                Hmmm... So you made that??? Man, reading the article, it seems like a microphone and headphones are the way to go and I had high hopes that this could do it.

                The article isn't super new but indicates that electronically distinguishing between detonation and other noises is very difficult, especially at lower volumes. I might still build one and do that ms box too....

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                • #9
                  Originally posted by Adrian View Post
                  I have one of these in my car

                  http://www.linkecu.com/products/Tuni...s/knocklink_g4

                  Pretty foolproof and by all reports very reliable.

                  Sent from my Nexus 4 using Tapatalk

                  What's the pricing on that like?

                  I can't find figures on that site.
                  1990 240sx - Aristo 2JZGTE, R154, GT37, Defsport Wilwood kit, KTS coilovers - daily driver
                  1991 civic si - B18C5 / toda / ATS / hytech - autox
                  2001 integra type R - Greddy td05-18g - garage queen

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                  • #10
                    Is the knock sensor on the sr a Bosch unit?

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                    • #11
                      Anyone know what kind of knock sensor we have on the sr's??
                      Last edited by jfryjfry; 07-10-2014, 07:52 AM.

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                      • #12
                        This is also a good option:
                        http://www.jandssafeguard.com/
                        First 300ZX to break 500whp on the Stock Turbo/Stock Long Block, boost only, no meth.
                        Currently building sub-2800# 300zx Twin BW 6258 EFR, AMB Aero, TA-U & Road Race Car.

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