knocksenseMS - who's got one?
#1
Senior Member
Thread Starter
iTrader: (2)
Join Date: Oct 2007
Location: Northeastern CT
Posts: 547
Total Cats: 2
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
... and who's using it effectively?
i bought one a WHILE ago... installed it, etc. The bosch knock sensor is bolted to the block where the OE knock sensor was (this is a familia GTR motor). I'd have tried using the stock knock sensor but it was damaged. i'm not sure if this is the same for the miata, but it's below the intake manifold between cyl 2+3 if i remember right.
i tried dialing it in... no matter what as soon as i hit ~4k or so it would light off, even with the sensitivity all the way down. in boost, in vac, free revving... didn't matter. i know for a fact that its not knocking in vac, plus i've been running it for 12k miles now on MS and its running fine... so i'm pretty sure i'm not having any deto problems.
anyway... annoyed that i may have wasted $75 or so, i unhooked it and put it away. the knock sensor is still mounted and shielded wire is still chillin in my harness, but thats all. i'm redoing the whole harness and adding a bunch of options to the MS in a few months - i'd like to get this thing working if possible.
any suggestions as to where i should mount the sensor? should i keep it where it is and insulate it with a plastic or rubber washer? does knocksense just not work worth a crap? any advice would be appreciated
i bought one a WHILE ago... installed it, etc. The bosch knock sensor is bolted to the block where the OE knock sensor was (this is a familia GTR motor). I'd have tried using the stock knock sensor but it was damaged. i'm not sure if this is the same for the miata, but it's below the intake manifold between cyl 2+3 if i remember right.
i tried dialing it in... no matter what as soon as i hit ~4k or so it would light off, even with the sensitivity all the way down. in boost, in vac, free revving... didn't matter. i know for a fact that its not knocking in vac, plus i've been running it for 12k miles now on MS and its running fine... so i'm pretty sure i'm not having any deto problems.
anyway... annoyed that i may have wasted $75 or so, i unhooked it and put it away. the knock sensor is still mounted and shielded wire is still chillin in my harness, but thats all. i'm redoing the whole harness and adding a bunch of options to the MS in a few months - i'd like to get this thing working if possible.
any suggestions as to where i should mount the sensor? should i keep it where it is and insulate it with a plastic or rubber washer? does knocksense just not work worth a crap? any advice would be appreciated
![](https://www.miataturbo.net/images/smilies/smile.gif)
#2
Former Vendor
![](/mt2011/images_td/ranks/supporter1.gif)
iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,103
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I have one, it's ******* excellent. I had the same problem you had; anything over 6500rpm and it would go off. I wired an additional potentiometer inline with the sensor to give me more adjustment and I was able to dial it in perfectly. When it goes off, there is knock, and when there is no knock, it's silent. Works flawlessly and I'm sure it's saved my motor quite a few times.
I have the sensor on the passenger side motor mount, below the starter, and the unit itself is in the glovebox. I used the FM mount to mount the sensor itself.
I have the sensor on the passenger side motor mount, below the starter, and the unit itself is in the glovebox. I used the FM mount to mount the sensor itself.
#3
Senior Member
Thread Starter
iTrader: (2)
Join Date: Oct 2007
Location: Northeastern CT
Posts: 547
Total Cats: 2
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
i'll have to take a look at this FM sensor mount and how/where your mounts bolt up. there is a carrier bracket for an intermediate shaft bearing on the back of my block, probably where your engine mount goes. hmmm
#14
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I've got one installed the same way Sav does, but without the extra pot. I also tuned it the way he suggested (run 100 octane and get it just a hair away from going off under full load/high rpm). I haven't found the need for a second pot as mine still has some adjustment left. So far it's only gone off a few times when I've been lean and the motor and ambient air are hot, so I assume it's working just fine. I never really hear the "coins rattling" though; maybe I should make some det cans to compare. I was under the impression that if you can actually hear pinging while driving then it's already really really bad.
#19
Elite Member
iTrader: (2)
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,606
Total Cats: 16
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
mine seems to be dialed in nicely. It flashed real quick today when i was on it hard and some knock may have been there. 99.9% of the time it doesnt go off, so i think its doing a great job of picking up only the actual knock at this point.
I have it taking off 1 degree of timing for every knock event (total of 3 degrees) and adding in 1 degree when there is no knock. I am on DIYs spark base map still.
I have it taking off 1 degree of timing for every knock event (total of 3 degrees) and adding in 1 degree when there is no knock. I am on DIYs spark base map still.