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  1. #1
    Autosport's Avatar
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    Pinging and knock detection

    When setting up a ski with more HP, how do you guys/tuners watch for detonation? do you use something like this on you ski?

    http://www.turboxs.com/more_info.php?ID=212

    or do 2 stroke engines have to much engine noise for these to work properly? (althought the TurboXS item is tunable and smart enough to differentiate between engine noise and detonation).




  2. #2
    All hail the Chief! fullboogie's Avatar
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    I can't see any way to detect detonation on these skis - they are so loud and vibrate so much, if you hear it then it's too late.

  3. #3
    Autosport's Avatar
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    hence my question to be able to use a tool such as the one above, which basically bolts directly to the cylinder. Has anyone tried such a tool before?

  4. #4
    cheatin' piston popper addicted's Avatar
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    i think I remember reading about deto sendors on groupK's site. I thnk they go under the spark plugs??

  5. #5
    Moderator OsideBill's Avatar
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    Quote Originally Posted by addicted View Post
    i think I remember reading about deto sendors on groupK's site. I thnk they go under the spark plugs??
    Bingo I read this too now to do some searching

  6. #6
    YudLuz2's Avatar
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    The ones that group K had cost around $5K. I don't think
    this setup would work, some of those depend on a knock
    sensors and you probably would need one on each cylinder.
    A good tuner can hear deto on most motors, but some are just
    to hard to catch, due to noise or other things. In some cases
    using ear plugs can help weed out some of the noise. But the
    most important thing is what it sounds like on a 2 stroke motor,
    if you know what to listen for, you can go a long way.

  7. #7
    Autosport's Avatar
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    Quote Originally Posted by YudLuz2 View Post
    some of those depend on a knock
    sensors and you probably would need one on each cylinder.
    That wouldn't be hard to have a sensor on each cylinder, all conected up to the one knock lite sitting on your dash. that way big red light flashes if you got bad fuel or something goes wrong.

    The sensors you can get from any car scrap yard, I've done this before on my subaru to put a sensor on each side of the boxer engine conected to the single knock light.

    the hardest thing would be making it waterproof, which I don't think would be to hard either.

  8. #8
    All hail the Chief! fullboogie's Avatar
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    My point is that I don't know if one would WORK. For example, my Lightning cannot use one because the supercharger noise interferes with a sensor's ability to pick up pinging. I believe some of the GM cars - either the last run of Camaros or perhaps certain Vettes (maybe ZO6) - cannot use them either.

    It therefore seemed a possibility that a knock sensor couldn't function in a 2 stroke environment. I should have explained my thoughts better.

  9. #9
    Autosport's Avatar
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    ok.. makes sense...

    I have one, so I might try it over out Australian summer this year, and see if it does or doesnt work. I spoke to TurboXS they seem to think it would work on 2 strokes, the problem they think would be the noise of the water on the hull affecting it... I guess you don't know unless you try ??

  10. #10
    philip_gpr's Avatar
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    I think having a low cost sensor we could use would be a great idea.

    I know others (GroupK for one) have used them on 2 strokes so we know it is possible.

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