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Thread: Listening to your engine - Part 1 in our series on Knock Detection - Apex Speed Technology Blog Post

              
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    Listening to your engine - Part 1 in our series on Knock Detection - Apex Speed Technology Blog Post

    I've added a new blog post to our blog about knock detection. Its the first of a multi-part series that talks about learning to identify detonation, then setup and work with audio-based knock detection setup like those that are common to aftermarket standalone ECUs.

    Check it out here:

    http://www.apexspeedtech.com/?p=233

    -Neel
    Neel Vasavada
    Apex Speed Technology
    2947 S Sepulveda Blvd
    Los Angeles, CA 90064
    310.314.2005 (p)
    310.496.0951 (f)
    www.apexspeedtech.com
    info@apexspeedtech.com

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    This is the technical stuff you guys crave. Nice post Neel.

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    Yep - good stuff and also people don't realize that knock sensors are tuned to a specific frequency but only account for noise produced by the pistons in the chambers. If you have an external wastegate or blow off valve or loud vanos unit, etc., all of these can cause false triggers that might make you want to re-tune the frequency... ultimately masking true knock event.

    I've used the old school method of crushed copper tubing bolted to the engine and a stethoscope. I like the J&S and Phormula stuff.


    Did you get my order Click here to enlarge


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    First thing my tuner told me was to throw out the knock sensors on my built motor and put on the knock ears. Good stuff!

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    that knock sensors are tuned to a specific frequency
    Not all. Some have a definite resonance, some have a very even output across a wide band of frequencies. Part of the art is knowing and choosing the right sensors.

    First thing my tuner told me was to throw out the knock sensors on my built motor and put on the knock ears. Good stuff!
    In my opinion, its smarter to learn how to use the sensors on your motor to your advantage than to throw them out. I'd consider that poor advice on the part of your tuner.

    -Neel
    Last edited by Apex Speed Technology; 07-27-2011 at 06:57 PM.
    Neel Vasavada
    Apex Speed Technology
    2947 S Sepulveda Blvd
    Los Angeles, CA 90064
    310.314.2005 (p)
    310.496.0951 (f)
    www.apexspeedtech.com
    info@apexspeedtech.com

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    The experienced human ear (with brain connected) is a great tool for calibrating a knock sensor that will be paying attention even when you're not. I can imagine why a tuner would say listening is more reliable than OEM sensors. Listening only works when you do though, and knock doesn't go away just because tuning is done.

    Dan

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    Click here to enlarge Originally Posted by Apex Speed Technology Click here to enlarge
    This quote is hidden because you are ignoring this member. Show Quote
    Not all. Some have a definite resonance, some have a very even output across a wide band of frequencies. Part of the art is knowing and choosing the right sensors.



    In my opinion, its smarter to learn how to use the sensors on your motor to your advantage than to throw them out. I'd consider that poor advice on the part of your tuner.

    -Neel
    The art of choosing the right sensor seems to be confirmed by math, which makes it science, not art Click here to enlarge


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    Awesome stuff!

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    i love info like this...keep it coming man Click here to enlarge much appreciated

    That Phormula Pro Tuning Solution looks very appealing..do you have any screenshots of the software showing outputs from the knock sensors?
    Last edited by dzenno@PTF; 07-27-2011 at 10:59 PM.


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    Click here to enlarge Originally Posted by Apex Speed Technology Click here to enlarge
    This quote is hidden because you are ignoring this member. Show Quote
    In my opinion, its smarter to learn how to use the sensors on your motor to your advantage than to throw them out. I'd consider that poor advice on the part of your tuner.

    -Neel
    He uses the knock sensor locations to put in his sensors and it's strictly a drag car I won't be letting off during a pass regardless of what's going on with the motor.

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    The art of choosing the right sensor seems to be confirmed by math, which makes it science, not art Click here to enlarge
    Ah, I disagree. Part of art to me is the act of drawing from the qualitative and subjective. My whole point is that subjective evaluation is what enhances the math. Part of the art is listening to a sensor that you haven't any information for and making a qualitative assessment of its frequency response characteristics.
    Neel Vasavada
    Apex Speed Technology
    2947 S Sepulveda Blvd
    Los Angeles, CA 90064
    310.314.2005 (p)
    310.496.0951 (f)
    www.apexspeedtech.com
    info@apexspeedtech.com

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    That Phormula Pro Tuning Solution looks very appealing..do you have any screenshots of the software showing outputs from the knock sensors?
    No I don't. That's where I'm not so well prepared for these; as I put out mere I"ll get better. I have done it quite extensively though with customers.

    -Neel
    Neel Vasavada
    Apex Speed Technology
    2947 S Sepulveda Blvd
    Los Angeles, CA 90064
    310.314.2005 (p)
    310.496.0951 (f)
    www.apexspeedtech.com
    info@apexspeedtech.com

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    very good read..I browsed through it last night Click here to enlarge

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