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Originally Posted by richyvrlimited
(Post 657874)
90R, I don't see how your idea would work, you want it sensitive at lower rpms and less sensitive at higher rpms, drilling a hole in the body.... I dunno how or if that'd work, a knock sensor is a sensitive device, drilling into it is likely to destroy it.
http://www.volvoclub.org.uk/faq/Imag...nockSensor.gif |
So? you implied you wanted to drill another hole?
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No not at all. That sensor mounts to a stud or through both to transmit the vibration. My idea is to use a dampened mounting / acoustical transmission device as a filter / tuning device.
Anyone an acoustical engineer? |
Originally Posted by hustler
(Post 657831)
If you don't filter and don't set pre-ignition sample period...you don't have usable knock control. This is the difference between an $800 computer and $3000. I don't see this as a problem on a turbo car considering you can retard spark and "up the boost" to compensate.
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No he means to only sample the engine noise at specific crank angles i.e. when the engine is compressing the air fuel mix.
means more accurate/reliable knock detection. 90R, I see what you mean. I don't think you idea has much merit to be honest. knock occours at a specific frequency, (dependant on bore diameter IIRC) the problem is the engine can drown that noise out, by dampening the signal you're not really helping matters. |
Originally Posted by richyvrlimited
(Post 657892)
90R, I see what you mean. I don't think you idea has much merit to be honest. knock occours at a specific frequency, (dependant on bore diameter IIRC) the problem is the engine can drown that noise out, by dampening the signal you're not really helping matters. I'm just not sure of the ability to tune the "bolt" to the exact frequency. I think the size would constrain it to a higher harmonic. Then I'm not sure how the time delay of the X harmonic to the knock event. Would play in any delays and potential damage. |
Probably a damn site easier and quicker to get a KnockLite ;)
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Originally Posted by richyvrlimited
(Post 657920)
Probably a damn site easier and quicker to get a KnockLite ;)
I called up turboxs and spoke with them about integrating with MS. They said: The knocklite outputs a 0-5v square wave for knock signal on the yellow wire. On the blue wire, it outputs rpm. |
Originally Posted by richyvrlimited
(Post 657920)
Probably a damn site easier and quicker to get a KnockLite ;)
Doing some reading it looks like knock resonates around 7 khz. +/- 1.6/1.8 It shouldn't be that difficult to find a material combination that can work. |
Originally Posted by faeflora
(Post 657922)
I have a knocklite.
I called up turboxs and spoke with them about integrating with MS. They said: The knocklite outputs a 0-5v square wave for knock signal on the yellow wire. On the blue wire, it outputs rpm. Awesome, I emailed and got no response, based on their reply it *should* be able to be plumbed straight into our MS's Good work :D |
It works so long as the 5V is no knock and 0V is knock. Even if its the opposite, its very easy to invert it using two NPN transistors.
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Well let me call them back and get more info on that output signal.
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Sorry to dig up an old thread. Fae, did you get any additional information on this?
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These guys got hold of turboXS and said this:
'i got an email back from turboxs. when the knocklite detects knock, the pin that connects to the DTEC-FC outputs 5v. when not detecting knock, it outputs 0V. that should be able to easily integrate into darn near any engine management system. Brian ' Ok, link denied, quick search for 'knocklite 5v output' finds a thread on another 'mx5' forum, in that thread theres a link to another turbo vehicle forum, lol. Also, it looks like you can configure ms2 (and surely ms3) to trigger knock on high or low so you don't have to do the hardware inverting of the signal... Win! http://www.msextra.com/doc/ms2extra/...ware.htm#knock |
Originally Posted by ianferrell
(Post 698550)
Also, it looks like you can configure ms2 (and surely ms3) to trigger knock on high or low so you don't have to do the hardware inverting of the signal... Win!
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well crap... I went ahead and got a knocklite from ebay, came Saturday. It doesn't have the wires or the connector that has the 5v signal on it... It only has the 4 main wires, power, ground, rpm and knock signal. No yellow or blue wires to be found.
update: sent email to turboxs to try to feegure out watts up. |
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Any updates on this, can knocklite be wired into DIYPNP?
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I am interested to?
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yes.
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