Reading knock sensors without a stock computer?
03-16-2005, 01:30 AM
#2
Originally Posted by Boostaholic
Does anyone know of a meter or gauge that will read a knock sensor and display the results?
03-16-2005, 08:52 AM
#3
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Harris (now Intersil) used to make knock sensor
interface ICs. I'm sure there are other old-line
industrial semiconductor companies that do also.
The chips need the filter params tweaked in for
the engine acoustics, want a spark pulse for the
blanking interval, but that's not too big a deal.
Given that, there's -got- to be some garage outfit
making knock-boxes, or kits.
I kind of wonder, whether you couldn't get the
info you need, by just putting the transducer(s) to
an amplifier and just listening. Just as you can hear
ping from the outside, bet you can hear it from the
inside over a wire and into your headphones. Dig
that heavy metal beat
Of course the nice thing about the stock setup is,
somebody has already done the setup work on all the
filtering & discrimination so you get nice clean knock
indication, tolerable level of falses (post-'98 anyway)
and reasonably good sensitivity. That's where the
tough part lies, I think, the calibration.
But hooking up the wires to a little amp and a set of
cheap noise cancelling headphones might give you
some interesting sonar.
interface ICs. I'm sure there are other old-line
industrial semiconductor companies that do also.
The chips need the filter params tweaked in for
the engine acoustics, want a spark pulse for the
blanking interval, but that's not too big a deal.
Given that, there's -got- to be some garage outfit
making knock-boxes, or kits.
I kind of wonder, whether you couldn't get the
info you need, by just putting the transducer(s) to
an amplifier and just listening. Just as you can hear
ping from the outside, bet you can hear it from the
inside over a wire and into your headphones. Dig
that heavy metal beat
Of course the nice thing about the stock setup is,
somebody has already done the setup work on all the
filtering & discrimination so you get nice clean knock
indication, tolerable level of falses (post-'98 anyway)
and reasonably good sensitivity. That's where the
tough part lies, I think, the calibration.
But hooking up the wires to a little amp and a set of
cheap noise cancelling headphones might give you
some interesting sonar.
