Adding knock sensor to AEM EMS
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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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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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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.
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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
Last edited by j_man; 04-15-2009 at 12:05 PM.
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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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Yeah, I used one with my AEM EMS (Bosch one which came with my Knocksense back then) too, but it was giving false alarms - maybe my car is noisier (maybe because of the supercharger whine). The Saturn one works better. 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.
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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.
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Knock should be louder than anything else around a timing event.
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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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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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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!