Adding knock sensor to AEM EMS - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 04-16-2009, 06:25 PM   #21
Senior Member
 
Join Date: Dec 2007
Posts: 671
Total Cats: 2
Default

Quote:
Originally Posted by Rafa View Post
Can one use the one that FM sells?
Nope. I have that adapter (from the Knocksense times) too but it doesn't fit the Saturn sensor thread.

Quote:
Originally Posted by Rafa View Post
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!
No worries. I forgot that I've told you too

Last edited by j_man; 04-16-2009 at 08:10 PM.
j_man is offline   Reply With Quote
Old 04-16-2009, 08:11 PM   #22
Senior Member
 
Join Date: Dec 2007
Posts: 671
Total Cats: 2
Default

Quote:
Originally Posted by projectmx View Post
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
I just used the engine mount bolt which is easiest to access from the passenger side wheel well. Just remove the wheel and take a look - one of the bolts is visible right there.
j_man is offline   Reply With Quote
Old 04-16-2009, 08:13 PM   #23
Elite Member
iTrader: (22)
 
Join Date: Dec 2006
Location: Sunny Spanish speaking Non US Caribbean
Posts: 3,257
Total Cats: 3
Default

Quote:
Originally Posted by j_man View Post
Nope. I have that adapter (from the Knocksense times) too but it doesn't fit the Saturn sensor thread.
Then I'm screwed because that's the one currently in my block.

What are my options? I read you went to some hardware store and bought something and had it welded. I just didn't understand what.

To the op: sorry for threadjacking

edit: I just saw your post. You mention a nut. (I guess I'm the nut in this instance).
Rafa is offline   Reply With Quote
Old 04-16-2009, 11:14 PM   #24
Senior Member
 
Join Date: Dec 2007
Posts: 671
Total Cats: 2
Default

Quote:
Originally Posted by Rafa View Post
Then I'm screwed because that's the one currently in my block.

What are my options? I read you went to some hardware store and bought something and had it welded. I just didn't understand what.

To the op: sorry for threadjacking

edit: I just saw your post. You mention a nut. (I guess I'm the nut in this instance).
You buy a 10x1.5mm nut from your local hardware store (the Saturn sensor, which is threaded, can bolt in that nut). Then you get your original motor mount bolt along with the new nut to a someone with a welder and tell him to weld the nut to the bolt head. And you end up with a mounting block for your new sensor
j_man is offline   Reply With Quote
Old 04-17-2009, 08:18 AM   #25
Elite Member
iTrader: (22)
 
Join Date: Dec 2006
Location: Sunny Spanish speaking Non US Caribbean
Posts: 3,257
Total Cats: 3
Default

Quote:
Originally Posted by j_man View Post
You buy a 10x1.5mm nut from your local hardware store (the Saturn sensor, which is threaded, can bolt in that nut). Then you get your original motor mount bolt along with the new nut to a someone with a welder and tell him to weld the nut to the bolt head. And you end up with a mounting block for your new sensor
Many thanks!
Rafa is offline   Reply With Quote
Old 04-17-2009, 11:51 AM   #26
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Nov 2006
Location: Windsor, Ontario, Canada
Posts: 84
Total Cats: 0
Default

will that work for an engine mounted transverse like in the AWD and FWD car? Which motor mount do you hook this on to?
projectmx is offline   Reply With Quote
Old 04-17-2009, 11:55 AM   #27
Elite Member
iTrader: (22)
 
Join Date: Dec 2006
Location: Sunny Spanish speaking Non US Caribbean
Posts: 3,257
Total Cats: 3
Default

Quote:
Originally Posted by projectmx View Post
will that work for an engine mounted transverse like in the AWD and FWD car? Which motor mount do you hook this on to?
Project; I don't see why not. j_man makes his suggestion about which side in our motors just based on the one that's easier to get to. Just look at your engine and hook it to the one that's easier to reach.
Rafa is offline   Reply With Quote
Old 04-20-2009, 01:27 PM   #28
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Nov 2006
Location: Windsor, Ontario, Canada
Posts: 84
Total Cats: 0
Default

my only engine mount that attatches to the block is the passenger side mount, i'm kind of confused how attaching the knock sensor to the mount will allow it to read knock inside the engine doesn't the end of the sensor actually have to touch the block?
projectmx is offline   Reply With Quote
Old 12-16-2009, 04:15 PM   #29
Junior Member
 
Join Date: Jul 2008
Posts: 96
Total Cats: 0
Default

Quote:
Originally Posted by TurboTim View Post
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.
I'm currently running the same exact set up. I believe the Links Bosch sensor is the same pn as used on the buick grand national among many others. On the Link the signal was beautiful and precise, on the few data logs I got b4 the i/o went out.

Now on the AEM EMS I've yet to see a signal above 0.99 volts. I've even started up the logging and started banging stuff with a hammer just to see what would get recorded. Still nothing above 0.99 volts. I thought this was a 5v sensor? Right now I just consider anything above 0.3v is probably real knock, and I've got my timing WAY retarded.

I'd like to have a knock function that I actually have faith in. Would an external bandpass filter help to get the old Link/Bosch/FM sensor to log like it used to on the Link? Is there any advantage to buying the "7 khz sensor from the GM Saturn, part number 21021879"? Should I rescale the sensor table in the AEM EMS from a 5v to a 1v?

I saw that 'JasonC SBB' mentioned a bandpass circuit, does anyone have the link?
GIGAPUNK is offline   Reply With Quote
Old 12-16-2009, 04:25 PM   #30
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,485
Total Cats: 248
Default

Quote:
Originally Posted by GIGAPUNK View Post
I'm currently running the same exact set up. I believe the Links Bosch sensor is the same pn as used on the buick grand national among many others. On the Link the signal was beautiful and precise, on the few data logs I got b4 the i/o went out.

Now on the AEM EMS I've yet to see a signal above 0.99 volts. I've even started up the logging and started banging stuff with a hammer just to see what would get recorded. Still nothing above 0.99 volts. I thought this was a 5v sensor? Right now I just consider anything above 0.3v is probably real knock, and I've got my timing WAY retarded.

I'd like to have a knock function that I actually have faith in. Would an external bandpass filter help to get the old Link/Bosch/FM sensor to log like it used to on the Link? Is there any advantage to buying the "7 khz sensor from the GM Saturn, part number 21021879"? Should I rescale the sensor table in the AEM EMS from a 5v to a 1v?

I saw that 'JasonC SBB' mentioned a bandpass circuit, does anyone have the link?
I didn't know you could rescale the sensor table to 1V, if so that's a good idea. It's not a 5v sensor. I think my cal table has knock defined around .3volts at normal rpm. I took a quick look at it before emailing it to Sav. But just sitting there idling the volts are very very low.
TurboTim is offline   Reply With Quote
Old 12-16-2009, 05:08 PM   #31
Junior Member
 
Join Date: Jul 2008
Posts: 96
Total Cats: 0
Default

I'm going to give this a try.

Name:  Capture.jpg
Views: 13
Size:  95.8 KB

I havn't been able to rescale the volt axis from 5v to 1v, but using auto expand, with knock volts in its own plot in AEMLog works just as well for viewing at least.
GIGAPUNK is offline   Reply With Quote
Old 12-16-2009, 06:32 PM   #32
Senior Member
 
Join Date: Dec 2007
Posts: 671
Total Cats: 2
Default

Quote:
Originally Posted by GIGAPUNK View Post
I saw that 'JasonC SBB' mentioned a bandpass circuit, does anyone have the link?
I just ran a search and found it here:
https://www.miataturbo.net/forum/t31284/


j_man is offline   Reply With Quote
Old 12-16-2009, 07:21 PM   #33
Junior Member
 
Join Date: Jul 2008
Posts: 96
Total Cats: 0
Default

thanx jman!
GIGAPUNK is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
1996 Turbo Build Goldwar DIY Turbo Discussion 2 09-29-2015 10:20 AM
Got bad Crank Angle Sensor and Random Misfire codes, but runs fine. Greasyman General Miata Chat 2 09-28-2015 11:44 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:12 AM.