Adding an LED to the knock sensor?
11-21-2002, 06:53 PM
#1
New User
Thread Starter
Adding an LED to the knock sensor?
Is it possible to attach some sort of LED to the knock sensor for knock monitoring, or is it more complex than that?
11-21-2002, 07:04 PM
#2
Honda-Tech Member
iTrader: (3)
Join Date: Feb 2002
Location: Carlisle, PA, usa
Posts: 1,534
Likes: 0
Received 0 Likes
on
0 Posts
Re: Adding an LED to the knock sensor? (Aeka GSR)
the knock sensor is like a little microphone, i dont think it will put out enough power to light up an LED.
11-21-2002, 07:11 PM
#4
What is this crap?
Re: Adding an LED to the knock sensor? (Aeka GSR)
its not really that simple, since you need to do some pretty complex filtering to get the led to light up for knock and not all the other engine noises it picks up.
Trending Topics
11-21-2002, 10:20 PM
#8
Honda-Tech Member
Join Date: Jul 2001
Posts: 899
Likes: 0
Received 0 Likes
on
0 Posts
Re: Adding an LED to the knock sensor? (Aeka GSR)
It is possible to do, as it has been done on DSMs for years, albeit in a slightly different manner.
On a DSM, when excessive knock is detected, they send power to the factory boost controller to open the valve completely and cut down on the amount of boost run. When you dont use the factory boost controller, or even if you do, you can tap into this wire on a DSM for powering a knock LED.
On a Honda, i'd imagine it would be possible to do something else as well. Remember, the ECU cannot filter what it detects as knock and what it does not, due to the fact that it is basically a microphone. Use the 12v output of the knock sensor and run that into an LED (make sure to put a resistor in front) and then mount the LED somewhere, whether it be in the cluster, the dash, whatever.
There you go, a knock LED in its most basic form, as it will blink whenever any form of "knock" is detected. I'm actually planning on doing this with my GSR due to the fact that my P28 w/ Hondata does not have an input for the knock sensor.
On a DSM, when excessive knock is detected, they send power to the factory boost controller to open the valve completely and cut down on the amount of boost run. When you dont use the factory boost controller, or even if you do, you can tap into this wire on a DSM for powering a knock LED.
On a Honda, i'd imagine it would be possible to do something else as well. Remember, the ECU cannot filter what it detects as knock and what it does not, due to the fact that it is basically a microphone. Use the 12v output of the knock sensor and run that into an LED (make sure to put a resistor in front) and then mount the LED somewhere, whether it be in the cluster, the dash, whatever.
There you go, a knock LED in its most basic form, as it will blink whenever any form of "knock" is detected. I'm actually planning on doing this with my GSR due to the fact that my P28 w/ Hondata does not have an input for the knock sensor.
11-22-2002, 02:22 PM
#11
Honda-Tech Member
Re: Adding an LED to the knock sensor? (philo)
The feedback on the hybrid forum seems to indicate that the MSD knock alert is a worthless piece of crap.
Sonny
11-22-2002, 02:37 PM
#12
Honda-Tech Member
Join Date: Dec 2001
Location: NW, FL
Posts: 1,170
Likes: 0
Received 0 Likes
on
0 Posts
Re: Adding an LED to the knock sensor? (Aeka GSR)
Ive heard bad things about knock sensing.
Please comment on the following:
*Knock sensor will sense VTEC switchover as knock.
*Having polyurethane motor mounts or anything stiffer will make knock sensor sense engine vibration as knock.
[Modified by Quick 200k Mile Motor, 6:37 PM 11/22/2002]
Please comment on the following:
*Knock sensor will sense VTEC switchover as knock.
*Having polyurethane motor mounts or anything stiffer will make knock sensor sense engine vibration as knock.
[Modified by Quick 200k Mile Motor, 6:37 PM 11/22/2002]
11-23-2002, 05:08 PM
#14
Honda-Tech Member
Re: Adding an LED to the knock sensor? (integra_gsr98)
It is possible to do, as it has been done on DSMs for years, albeit in a slightly different manner.
On a DSM, when excessive knock is detected, they send power to the factory boost controller to open the valve completely and cut down on the amount of boost run. When you dont use the factory boost controller, or even if you do, you can tap into this wire on a DSM for powering a knock LED.
On a Honda, i'd imagine it would be possible to do something else as well. Remember, the ECU cannot filter what it detects as knock and what it does not, due to the fact that it is basically a microphone. Use the 12v output of the knock sensor and run that into an LED (make sure to put a resistor in front) and then mount the LED somewhere, whether it be in the cluster, the dash, whatever.
There you go, a knock LED in its most basic form, as it will blink whenever any form of "knock" is detected. I'm actually planning on doing this with my GSR due to the fact that my P28 w/ Hondata does not have an input for the knock sensor.
On a DSM, when excessive knock is detected, they send power to the factory boost controller to open the valve completely and cut down on the amount of boost run. When you dont use the factory boost controller, or even if you do, you can tap into this wire on a DSM for powering a knock LED.
On a Honda, i'd imagine it would be possible to do something else as well. Remember, the ECU cannot filter what it detects as knock and what it does not, due to the fact that it is basically a microphone. Use the 12v output of the knock sensor and run that into an LED (make sure to put a resistor in front) and then mount the LED somewhere, whether it be in the cluster, the dash, whatever.
There you go, a knock LED in its most basic form, as it will blink whenever any form of "knock" is detected. I'm actually planning on doing this with my GSR due to the fact that my P28 w/ Hondata does not have an input for the knock sensor.
11-24-2002, 05:59 PM
#15
Junior Member
Join Date: Mar 2002
Location: V8 Land, State of, USA
Posts: 372
Likes: 0
Received 0 Likes
on
0 Posts
Re: Adding an LED to the knock sensor? (keebler65)
Not wanting to be an *** and burst your bubble, but this will never work. Sensing knock is much more complicated:
1. The knock sensor voltage output is not on or off, but varies in intensity
2. The knock sensor will pick up ignition and exhaust valve openning as knock (duh) as it does not filter when it listens. The ECU only listens to the sensor on the compression stroke before firing the spark.
3. The stock knock sensor was NEVER meant to contol knock under boost. Don't even think of using it like this. It does not have enough authority, even in the P72 ECU.
4. The sensor does not output any current that is usable, only voltage. You would need and amplifier/display circut made
The J&S unit is the best thing to have if you are running stock ECU. But it ain't cheap, as you can see why.
IMHO the best thing to do is never get into this situation... 1.5 deg per pound of boost on stock internals @13:1 works, I've seen it to 10 psi.
Sean
1. The knock sensor voltage output is not on or off, but varies in intensity
2. The knock sensor will pick up ignition and exhaust valve openning as knock (duh) as it does not filter when it listens. The ECU only listens to the sensor on the compression stroke before firing the spark.
3. The stock knock sensor was NEVER meant to contol knock under boost. Don't even think of using it like this. It does not have enough authority, even in the P72 ECU.
4. The sensor does not output any current that is usable, only voltage. You would need and amplifier/display circut made
The J&S unit is the best thing to have if you are running stock ECU. But it ain't cheap, as you can see why.
IMHO the best thing to do is never get into this situation... 1.5 deg per pound of boost on stock internals @13:1 works, I've seen it to 10 psi.
Sean
11-24-2002, 06:17 PM
#16
Honda-Tech Member
Join Date: Jul 2001
Posts: 899
Likes: 0
Received 0 Likes
on
0 Posts
Re: Adding an LED to the knock sensor? (keebler65)
You could get it to light up and flash but it really isn't worthwhile, other than just using it as an indicator of "knock". Basically on DSMs we use it to get a *rough* idea as to where in the RPM band the motor is knocking. Noisy lifters, valves opening and closing, the motor vibrating, and the vtec crossover, as stated above, will cause the knock sensor to go off. So it is just a novelty type item.
Thread
Thread Starter
Forum
Replies
Last Post