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02-11-2007, 04:22 PM | #1 |
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Member#: 53665
Join Date: Jan 2004
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Location: Northboro, MA
Vehicle:2022 BMW M240i Thundernight |
Tapping the stock knock sensor, will this work?
Hey guys,
I am entertaining the idea of tapping my stock knock sensor based on this write up: http://home.netcom.com/~bsundahl/kno...ten/listen.htm Pretty much, I can tap the sensor wire, put in a capacitor and resistor and run it into some kind of a listening device. This seems straightforward to me except for one part. My stereo has an auxiliary stereo input which I'd love to use for listening to the sensor. Would the whole thing work if I just connected the signal off the sensor to an aux plug which I can than convert to a proper stereo plug and run that into the deck? I am concerned that the signal will not be enough for me to hear through the deck. Do I have to do some kind of an amplification first? I searched around and there's lots of old threads with indirect info. If someone has a similar setup running, please send me some info. Any help is much appreciated.
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02-11-2007, 08:04 PM | #2 |
Scooby Specialist
Member#: 2998
Join Date: Nov 2000
Chapter/Region:
VIC
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Vehicle:2002 WRX WRB |
That circuit is an audio amplifier, you need it to be able to hear it.
I have used it and it works well. The signal coming from the knock sensor is too weak for you to plug into your line input, and you need that capacitor anyway to isolate any DC from getting into your ecu. |
02-12-2007, 08:54 AM | #3 | |
Scooby Specialist
Member#: 53665
Join Date: Jan 2004
Chapter/Region:
NESIC
Location: Northboro, MA
Vehicle:2022 BMW M240i Thundernight |
Quote:
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02-12-2007, 09:46 AM | #4 |
Scooby Specialist
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Join Date: Jul 2002
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Vehicle:2002 PSM WRX (Sold) 2017 BMW X5 |
Useless. It DOES give you audio but you can't hear the difference between what is knock and what is just a loud as heck engine. I've tried it, it doesn't do anything but make lots of noise since our knock sensor is broad spectrum and the processing is done in the ECU.
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02-12-2007, 10:16 AM | #5 | |
Scooby Specialist
Member#: 53665
Join Date: Jan 2004
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06-12-2007, 03:06 PM | #6 |
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South East
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Vehicle:2002 WRX chassis... stage-infinity.com |
I am *still* in the market for a device like the one you mention, Ziggyrama.
I've done the wiring as you pointed at in your first post. With post-analysis using "Gram" or "Cool Edit Pro" it is most definitely better than NOT listening. I have wanted to make something proper for years now but I lack the electronics skills to design the unit. I even offered $50 to a certain forum to help me out. All I frickin want is 4KHz - 8KHz from a knock sensor in realtime with volume control and a headphone jack. Hell, maybe I'll just rip apart a TXS KnockLite and amplify its signal to an audio jack somehow. |
06-12-2007, 05:48 PM | #7 | |
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Vehicle:02 WRX Sedan Silver |
Here's an interesting post from http://www.enginuity.org/viewtopic.php?p=6921#6921:
Quote:
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06-12-2007, 06:12 PM | #8 |
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Chapter/Region:
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Yes, unfortunately, Link ECU USA is in "la la land" so getting a KnockBlock is almost futile.
http://www.linkecu.com/dealers/dealersusa * http://www.link-electro-usa.com/ : Tried their Contact Us email address. Bounced. * Off Road Buggy Supply (O.R.B.S.) looks super sketchy. Would not order from them. * Vivid Racing ... nuff said. Won't order from them on principle alone, let alone their high prices. * Brain Storm, aka miata.org : Dead link * http://www.finelineimports.net/ : Cannot find KnockBlock anywhere on the site * http://www.flyinmiata.net : Zero search results for KnockLink or KnockBlock * http://www.fairfieldcountymotorsport.com/ : Zero Link products shown |
06-12-2007, 06:16 PM | #9 |
Scooby Guru
Member#: 8512
Join Date: Jul 2001
Chapter/Region:
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Not only that, tried to order from www.linkecu.com directly.
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06-12-2007, 07:02 PM | #10 |
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Maybe you should try their forums to see whether anyone anywhere will sell you a KnockBlock.
http://www.linkecu.com/forum/forums |
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