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Old 10-16-2009, 11:45 PM   #1
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Default Where do you mount your det cans?

just as the title says. What point on the block do, you who have used det cans, mount the pickup to? Or does this location not matter, just so long as it is mounted to the engine?

thanks,
Jared
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Old 10-17-2009, 12:00 AM   #2
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Ive always used a bolt on the valve cover when Ive done it on hondas, I havent done it on the miata yet, but Id imagine that it would work all the same.
You can hear quite a lot, i remember doing it once on my buddys car and the sound of the BOV was louder than anything else

edit:
one of the bolts that hold the engine listing points would probably be good, since theyre directly on the head
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Old 10-17-2009, 12:06 AM   #3
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most people i've seen do it bolt it to the motor mounts near the oil pressure sensor and the oil filter.
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Old 10-17-2009, 12:09 AM   #4
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Quote:
Originally Posted by Full_Tilt_Boogie View Post
Ive always used a bolt on the valve cover when Ive done it on hondas, I havent done it on the miata yet, but Id imagine that it would work all the same.
You can hear quite a lot, i remember doing it once on my buddys car and the sound of the BOV was louder than anything else

edit:
one of the bolts that hold the engine listing points would probably be good, since theyre directly on the head
Wouldn't you just hear valve train noise? I'd think you'd want it to be lower down on the engine.
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Old 10-17-2009, 12:26 AM   #5
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I remove the factory knock sensor and screw it in there.
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Old 10-17-2009, 12:45 AM   #6
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Quote:
Originally Posted by jayc72 View Post
Wouldn't you just hear valve train noise? I'd think you'd want it to be lower down on the engine.
you hear the valve train a lot, but the detonation is so sharp and loud it stands out, but I suppose it would be beneficial to mount it on the block, im just too lazy
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Old 10-17-2009, 05:17 AM   #7
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I'd think the oil filter side on the engine mount bolts would be best. The upper most bolt would be just about right in height.
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Old 10-17-2009, 08:04 AM   #8
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I mounted mine in the OEM location which is near the oil filter. Its on every 5 engine and some have knock sensors already there some don't. Mine didn't so I needed to find a bolt setup that worked to mount it. Basically one bolt for the hole the drill and tap that bolt for another bolt to mount the sensor. Took more time to jack the car up than wiring it all up and fit it.
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Old 10-17-2009, 10:53 AM   #9
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Quote:
Originally Posted by JayL View Post
I remove the factory knock sensor and screw it in there.
+1
Which is on the outside of the cylinder walls, on the short block, near the oil filter. My Bosch knock sensor is mounted there = my det can.
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Old 10-17-2009, 02:58 PM   #10
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wow, thanks for all the great info! I tried mounting it on the furthest back mounting stud on the intake manifold. So far i only hear valve train noise. So either this is a good thing and i have no detonation, or it is drowned out by the valve noise.

i will try attaching it to the same location as the stock knock sensor.
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Old 10-17-2009, 08:23 PM   #11
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Here is a thread on my local MX5 forum which uses a bandpass filter as well as normal knock sensing to help reduce false readings.
Hope we can help you and others
DIY Det Cans
Band pass filter
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Old 10-17-2009, 08:48 PM   #12
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I posted a BP filter for use with the factory sensor and any ECU in the ECU section.

I looked at actual Miata knock waveforms and the knock center frequency was 13 kHz.
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Old 10-17-2009, 09:09 PM   #13
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Quote:
Originally Posted by rrjwilson View Post
Here is a thread on my local MX5 forum which uses a bandpass filter as well as normal knock sensing to help reduce false readings.
Hope we can help you and others
DIY Det Cans
Band pass filter
Damn Im stupid. I thought DET CANS, were literally a tube mounted on the block connected to a can for the purpose of listening to whats happening during combustion.
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Old 10-17-2009, 09:20 PM   #14
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Quote:
Originally Posted by JasonC SBB View Post
I posted a BP filter for use with the factory sensor and any ECU in the ECU section.
I looked at actual Miata knock waveforms and the knock center frequency was 13 kHz.
Cool work. Ours was from the Adaptronic sensing at 7.3kHz so the bandpass focuses there but its all DIY so cost sod all. It might help.
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Old 10-17-2009, 09:50 PM   #15
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Quote:
Originally Posted by buffon01 View Post
Damn Im stupid. I thought DET CANS, were literally a tube mounted on the block connected to a can for the purpose of listening to whats happening during combustion.
Mine are. They work just fine when mounted to the engine mount. I trust my ear more than the waves and or a light. Now, electronic mic to headphones I would trust, but not waveform ****.
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Old 10-18-2009, 06:53 AM   #16
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Well Hustler you'd like that kit I posted up then. Some use it with a knock sensor some use it with the mic but no-one has shown how the mounted the mic so I cant help there.
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Old 10-18-2009, 08:06 AM   #17
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My det cans consist of the KnockSenseMS supplied knock sensor, a mic input in my laptop, Windows Volume Control and Sennheiser headphones.
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Old 10-18-2009, 09:35 AM   #18
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Quote:
Originally Posted by Spookyfish View Post
My det cans consist of the KnockSenseMS supplied knock sensor, a mic input in my laptop, Windows Volume Control and Sennheiser headphones.
Slightly bulky but uber
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Old 10-18-2009, 11:36 AM   #19
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jeez, fancy stuff guys. I am just using the tube and headset stethoscope method.
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Old 10-18-2009, 01:26 PM   #20
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Seems like a cheap easy way to keep form blowing your **** up during tuning.
The shop i used to work at had a dyno and we would wear the earmuffs and just lean over near the back of the engine, the earmuffs filter out all the lower pitch stuff and detonation is very clear. This method was not used on anything that we thought could sling pats, either way it was probably horribly unsafe.
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