KnocksenseMS - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 02-22-2008, 03:30 PM   #1
Guest
Thread Starter
iTrader: (6)
 
Join Date: Sep 2007
Location: Vaughan, On, Canada
Posts: 1,092
Total Cats: 0
Default KnocksenseMS

Who here uses KnocksenseMS? I'm about 24 hours away from purchasing my Megasquirt setup and am still on the fence in regards to KnocksenseMS. Here is a little bit of my background and it might explain why I am sitting on the fence with this.

- My Car already had a knock link installed when I purchased it. (I look at it when tuning, but leave it in the glove box most times)
- My 700whp Honda Civic does not have a knock sensor, and none of the 500+ Honda's I have tuned do either,
- My old Miata (498hp) ran a LINK, TECII, TEC3 and FJO Ecu all without a knocksensor.
- All I run in my Miata is 94 Octane Fuel.

I've never run a knock sensor, and **TOUCH WOOD** have never hurt and engine due to knock.

I know it is only about an extra $100 for the knocksetup, but I'm really not sure if I need it, plus I plan to install some stiff mounts and I am worried about falses (I once tried the knock sensor on my FJO and had this issue)

Your thoughts?

Do you folks run this KnocksenseMS on your Megasquirt setups?

Last edited by M-Tuned; 02-22-2008 at 04:16 PM.
M-Tuned is offline   Reply With Quote
Old 02-22-2008, 03:37 PM   #2
Elite Member
iTrader: (21)
 
paul's Avatar
 
Join Date: Jun 2006
Location: Point Pleasant, NJ
Posts: 2,957
Total Cats: 2
Default

i don't. i bought one but couldn't get it to not light up all the time.

i like to live dangerously though.
paul is offline   Reply With Quote
Old 02-22-2008, 04:13 PM   #3
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

I have the KS MS and i use the stock '99 sensor. It works, but i never tried to "tune" it. I have it disable right now, to the highest setting so it never flashes. Just haven't had the time.
cjernigan is offline   Reply With Quote
Old 02-22-2008, 04:30 PM   #4
Hittin' Boost & Cones
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

i like it. i have it tuned pretty well to be used as a safety procaution. Itll show knock at high rpm/load when the engine is cold and thats about it. It seems to be pretty "acurate" to the point where its not goin off all the time, but still gives me a heads up when the engine is runnin a little rough and possibly knocking
240_to_miata is offline   Reply With Quote
Old 02-22-2008, 04:34 PM   #5
Elite Member
iTrader: (30)
 
Join Date: Aug 2007
Location: Va Beach
Posts: 7,282
Total Cats: 0
Default

hmm, im about to order my MS also and now im unsure if I should get the knocksense. How hard is it to tune and do stiffer mounts really make it harder? I have comp mounts now and en ebay torque strut. Someone tell me why i should get it.
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
levnubhin is offline   Reply With Quote
Old 02-22-2008, 04:59 PM   #6
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,440
Total Cats: 198
Default

I run a knock sensor (the stock one on the NB) using the recommended circuit on the msextra manual (no KnockSense here).

Jim
Reverant is offline   Reply With Quote
Old 02-22-2008, 05:07 PM   #7
Hittin' Boost & Cones
iTrader: (2)
 
240_to_miata's Avatar
 
Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,572
Total Cats: 11
Default

Quote:
Originally Posted by Reverant View Post
I run a knock sensor (the stock one on the NB) using the recommended circuit on the msextra manual (no KnockSense here).

Jim
I've heard knocksense is alot more accurate than that circuit. Its really just a matter of turning down the sensitivity until its not annoying. you get it to where it goes off every time u get on high rpm/load and then just turn it slightly less sensative than that... so it only detects knocks or abnormal vibration
240_to_miata is offline   Reply With Quote
Old 02-22-2008, 05:08 PM   #8
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

That circuit just doesn't look like much fun, and it doesn't include a nice case. If i absolutely had to build that one myself I would, but when the KS is offered in such a nice package, its hard to pass up. Plus it is a tuned circuit so you just have to adjust the sensitivity.
cjernigan is offline   Reply With Quote
Old 02-22-2008, 05:38 PM   #9
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,914
Default

Knock tends to occur within a specific and narrow frequency range for any given engine, and is largely determined by the cylinder diameter. To improve the false-rejection abilities of a knock detection system, you can either use a narrowband sensor (as some OEMs do) or use a bandpass filter on the detector as KSMS does- you tell Boris your engine bore and he sets it up. The only user adjustment is a potentiometer to set the sensitivity (gain) of the circuit.

I found that mine tended to false trigger a lot when initially installed. I've been slowly tweaking the potentiometer (turn a bit, drive a bit) and have found that the propensity for false triggering seems to increase linearly with RPM. I got mine to the point where it doesn't seem to false trigger except occasionally on shifting, at which point it doesn't matter anyway. FWIW, this is on a 1.6 with MazdaComp motormounts and noisy-as-hell lifters.

I consider it a nice piece of insurance. I mounted the LED on the top of the steering column (in a small box, pointed directly at my face) and it's bright enough to notice in full sunlight.
Joe Perez is offline   Reply With Quote
Old 02-22-2008, 05:49 PM   #10
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Quote:
Originally Posted by Joe Perez View Post
I consider it a nice piece of insurance. I mounted the LED on the top of the steering column (in a small box, pointed directly at my face) and it's bright enough to notice in full sunlight.
Have a picture of said box? I want to make a shift light assembly with some leds and have been looking for a box like what reverant uses, can't seem to get one around here though.
I too put my LED on my steering column though it is in a hole i drilled in the steering column cover, exactly like what Scott did to his. I can also see it during the day in bright sunlight.
cjernigan is offline   Reply With Quote
Old 02-22-2008, 07:28 PM   #11
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,440
Total Cats: 198
Default

Here is mine btw.

Jim
Attached Thumbnails
KnocksenseMS-p1010012_1.jpg  
Reverant is offline   Reply With Quote
Old 02-23-2008, 01:10 AM   #12
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

Yeah i love your box, wish i had one just like it.
cjernigan is offline   Reply With Quote
Old 02-23-2008, 04:39 AM   #13
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,440
Total Cats: 198
Default

I can get you one if you want, the next time I hit the hardware store.

Jim
Reverant is offline   Reply With Quote
Old 02-23-2008, 02:13 PM   #14
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

This kind of looks like it would work well or the same purpose. Still gotta hit up the local hobby lobby to see if they have anything though.
http://ElectronicsUSA.com/miniboxes4.html
cjernigan is offline   Reply With Quote
Old 02-23-2008, 04:30 PM   #15
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,317
Total Cats: 1,914
Default

Quote:
Originally Posted by cjernigan View Post
Have a picture of said box?
Mine is pretty similar to Rev's. I went to Fry's and bought a tiny little project box that looks like it was intended for building a remote control or something. I removed one of the end plates, and mounted the LED deep inside the case at the other end. This way it's shielded from sunlight. It's mounted so that the open end faces back towards me.

Joe Perez is offline   Reply With Quote
Old 04-06-2008, 10:32 PM   #16
Elite Member
iTrader: (3)
 
AbeFM's Avatar
 
Join Date: Aug 2006
Location: San Diego, CA
Posts: 3,048
Total Cats: 8
Default

JESUS your car looks ricier every time I see it!!

Anyway, with my original (non-MS) knocksense I guess it works, when I was running a front liscence plate, it lit up all the time on the freeway (blocked intercooler) but not before or after that.

Now I don't trust it again. One thing, once I set it for no false positives (free reving in a parkinglot when fully warmed up) I never get any weird wrong signals, except above 7k indicated, which might be since I tuned it on the stock tach, not the MS powered one.
AbeFM is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
FFS Build, converting to MS. Andre94R Supercharger Discussion 23 06-16-2016 02:00 PM
First dyno session Too much ignition retard = knock? kidrabbit84 ECUs and Tuning 52 01-24-2013 10:17 AM
WBO2 dying? log inside Oscar MEGAsquirt 5 10-29-2010 11:11 PM
FS: KnockSenseMS for 1.8l + Sensor/Harness + Random Wires orion4096 Miata parts for sale/trade 6 01-25-2010 11:09 AM
KnockSenseMS sensor question elesjuan MEGAsquirt 10 12-14-2007 11:21 PM


Thread Tools

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 12:33 PM.