Adding knock sensor to AEM EMS
I have a 30-1710 AEM EMS I am having someone help me set up a wire harness for my engine for it and I would like to add a knock sensor eventually. I looked at the PDF file for the EMS and it mentions one pinout for a knock sensor but I wasn't sure what i need to do to wire one in and what would be a good one to use. If anyone can give me some wiring advice for it and if i should look for a stock miata one from a certain year or some kind of aftermarket one that will work with the miata.
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Search for one sold by Boris. It's called Knocksense. It'll do the job. You'll have to fine tune it.
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Engine knock detection and indication for all vehicles is this the one? while i was previously searching the knocksensems was the onely one i saw come up and a lot of times complaints were associated with those discussions i believe you even posted saying you weren't impressed with its efficiancy. So is this a waste of time? is a knock sensor in general a bad idea? I didn't look into the knocksense before also because i assumed the ms on the end meant it only worked for the megasquirt not the AEM EMS also
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Originally Posted by projectmx
(Post 393608)
Engine knock detection and indication for all vehicles is this the one? while i was previously searching the knocksensems was the onely one i saw come up and a lot of times complaints were associated with those discussions i believe you even posted saying you weren't impressed with its efficiancy. So is this a waste of time? is a knock sensor in general a bad idea? I didn't look into the knocksense before also because i assumed the ms on the end meant it only worked for the megasquirt not the AEM EMS also
The AEM will recognize it. |
You can use a saturn knock sensor for the EMS. Search the AEM forums for details. You have to run a shielded wire to the sensor and mount it to the block using a modified bolt. I've got one installed but I haven't got it working real well yet.
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Originally Posted by Rafa
(Post 393583)
Search for one sold by Boris. It's called Knocksense. It'll do the job. You'll have to fine tune it.
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Originally Posted by stinkonamonkey
(Post 395466)
You can use a saturn knock sensor for the EMS. Search the AEM forums for details. You have to run a shielded wire to the sensor and mount it to the block using a modified bolt. I've got one installed but I haven't got it working real well yet.
Flat response sensors won't work. |
Originally Posted by projectmx
(Post 393608)
Engine knock detection and indication for all vehicles is this the one? while i was previously searching the knocksensems was the onely one i saw come up and a lot of times complaints were associated with those discussions i believe you even posted saying you weren't impressed with its efficiancy. So is this a waste of time? is a knock sensor in general a bad idea? I didn't look into the knocksense before also because i assumed the ms on the end meant it only worked for the megasquirt not the AEM EMS also
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Originally Posted by j_man
(Post 395910)
+1. The resonant Saturn sensor is the one he needs.
Flat response sensors won't work. It's a leftover from my link ecu days. |
I looked through the aem website searched miata nock sensor / saturn knock sensor / and nock sensor couldn't find any info though. when adding the wire or wires into the harness for the knock sensor do i add only one or two? The AEM single Pinout do i run one wire from there only or do i add a second "ground" wire to the aem pinout somewhere also? and honestly which one would be best for the knock sensor a wideband bosch one or that saturn one (and if i get the saturn one which engine is it from?) one i get it done i'll post most info and a howto (this could be a while though since I still have a decent amount of work on the car to make it run)
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Originally Posted by TurboTim
(Post 395945)
I am using a flat response (bosch?) knock sensor on my aem ems and it does work. Not ideal due to the low voltage but it does work.
It's a leftover from my link ecu days. |
Originally Posted by projectmx
(Post 396150)
I looked through the aem website searched miata nock sensor / saturn knock sensor / and nock sensor couldn't find any info though. when adding the wire or wires into the harness for the knock sensor do i add only one or two? The AEM single Pinout do i run one wire from there only or do i add a second "ground" wire to the aem pinout somewhere also? and honestly which one would be best for the knock sensor a wideband bosch one or that saturn one (and if i get the saturn one which engine is it from?) one i get it done i'll post most info and a howto (this could be a while though since I still have a decent amount of work on the car to make it run)
MX-5 Miata Forum - Who's running a knock sensor with the AEM EMS? You can get the connector either from a GM car in some junkyard, or order one along with your sensor from places like www.rockauto.com (that's where I got both my sensor and connector from there) I use a shielded wire for the signal. If you do too, connect only one end of the shield to chassis ground. Besides that, the connection sensor to EMS is just one wire. |
Originally Posted by j_man
(Post 396247)
The reason is unlike the Link, the AEM EMS doesn't have a built in bandpass filter so you even strong non knock frequencies are seen as knock from the ECU.
Knock should be louder than anything else around a timing event. |
I think i found the knock sensor... it is the one for 1991 - 1995 Saturn SC and SL as well as the 1993-1995 SW series. now to figure out how to weld a nut onto the cylinder head if i read his instructions right. I really don't need the knock sensor yet but i'm still going to look into the stuff for it if it isn't too pricey i may go ahead and buy it and install it now so that by the time i get the turbo added to the car the knock sensor will already work
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Originally Posted by projectmx
(Post 396607)
I think i found the knock sensor... it is the one for 1991 - 1995 Saturn SC and SL as well as the 1993-1995 SW series. now to figure out how to weld a nut onto the cylinder head if i read his instructions right. I really don't need the knock sensor yet but i'm still going to look into the stuff for it if it isn't too pricey i may go ahead and buy it and install it now so that by the time i get the turbo added to the car the knock sensor will already work
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Originally Posted by j_man
(Post 396707)
I bought the nut from the local hardware store then brought it along with the engine mount bolt to the exhaust shop around the corner and they welded the two - they didn't even charge me because it was like a 2 minute job (I just tipped the welder)
BTW j_man; I stand corrected on the knock sensor. I just reread the thread on m.net about the subject. This is the second time you suggest it to me and I simply forgot. That's what old age does to me! |
you put it on the engine mount rather than the cylinder head?
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FM's goes on the engine mount. All knock sensors I've seen in OEM apps go on the engine block, not the cylinder head. I haven't seen much though.
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Originally Posted by projectmx
(Post 396724)
you put it on the engine mount rather than the cylinder head?
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so it either goes on a particular mount or it goes on the engine block... i need to find a miata i can look at
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