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Knock Detection


Roland@pcmtec
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A few people have asked what to use for knock detection. Whilst the factory system works ok for a factory car on factory boost levels, it will often miss real knock and it will also detect false knock.

Some recommendations below

Plex 

https://www.plex-tuning.com/products/plex-knock-monitor/

Knock Box

http://theknockbox.com.au/

Link G4 Knock block

http://dealers.linkecu.com/G4PlusKnockBlock

 

If you are poor and handy electrically you can always do the old school method of a microphone wrapped in foam inside a metal tube screwed onto something on the block, then hook this up to an amplifier (low pass filter recommended) and noise cancelling head phones.

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27 minutes ago, Roland@pcmtec said:

If you are poor and handy electrically you can always do the old school method of a microphone wrapped in foam inside a metal tube screwed onto something on the block, then hook this up to an amplifier (low pass filter recommended) and noise cancelling head phones.

 

Lol is being poor a prerequisite? I prefer to think of myself as frugal and self sufficient ?

I bought something similar to this but not this exact one. I opened it up, desoldered the microphone and ran a couple of meters of speaker wire to a bosch donut sensor. I bolted it to the knock sensor location on the block (on a 5 litre holden) and you can hear everything very clearly.

The only issue I found was when the engine noise got too loud it would crap out, presumably due to too much signal input. 

I haven't messed with it further but I'm sure you could fix it up with mechanical or electrical methods.

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23 minutes ago, Puffwagon said:

 

Lol is being poor a prerequisite? I prefer to think of myself as frugal and self sufficient ?

Issue is mainly time, if you have time to tweak and build your own setup the can turn out brilliantly. Pete L at Nistune built his own using refurbished noise cancelling comtag military headphones, was like your head was inside of the engine! Could hear knock amazingly well.

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4 hours ago, Puffwagon said:

I bought something similar to this but not this exact one. I opened it up, desoldered the microphone and ran a couple of meters of speaker wire to a bosch donut sensor. I bolted it to the knock sensor location on the block (on a 5 litre holden) and you can hear everything very clearly.

Exactly what i did :P using the one in your link.  Here's the article i followed, for anyone that is interested.

http://www.autospeed.com/cms/article.html?&title=DIY-Detonation-Detection-Part-2&A=0353

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