KnocksenseMS for Megasquirt and others

[Boris740]

For those who do not already know I have integrated Megasquirt & Spark Extra knock signal interface in KnocksenseMS. This will allow you to pull your timing should the knock occur. I have also added another output that connects to CLT line and superimposes a sharp spike on the datalog when the knock occurs. This short transient does not affect the operation of the engine. The LED is still there. Wiring diagram is on my website.
http://www.viatrack.ca/KnockMS/KnocsenseMS_LED.jpg

[bryant]

I received mine yesterday, Boris...
Very nice pkg.
Looks just like the picture.

Fair warning, tho, I may be bugging you next week when it is time to hook it up.

regards
Bill

[ovlov760]

That one looks a bit different than mine.

[n xntrx volvo]

that sucks, for me, not for anyone looking to buy a new one. grr, time to go burn myself on the soldering iron.

[the poi]

I know I'll be buying one soon, filtered knock circuit, whoo!

[ovlov760]

Are those bigger ones improved in someway over the old ones?

[the poi]

they have a direct output to the knock input pin for MSnS-extra... meaning, no need for a knock input circuit

[ovlov760]

The only problem with that for me is that my knock sense light comes on between 4-5k rpm and stays on no matter what. I hear no knocking and my AFR is good. Doesn't matter if im in boost or not.

[Magnum TE]

so how about those that have hte regular knocksence unit, whats the best way to wire that into ms? Should we just connect the stock sensor wires intot he external knock circuit from ms? I'd rather use your knocksence in some way

[the poi]

The only problem with that for me is that my knock sense light comes on between 4-5k rpm and stays on no matter what. I hear no knocking and my AFR is good. Doesn't matter if im in boost or not.
turn down the sensitivity. even a filtered circuit is going to be tripped by noise at high rpm's. the other option is to keep the sensitivity where it is at now, and tell MS to disable knock retard after a certain RPM. This is how Volvo did it for LH....

[ovlov760]

turn down the sensitivity. even a filtered circuit is going to be tripped by noise at high rpm's. the other option is to keep the sensitivity where it is at now, and tell MS to disable knock retard after a certain RPM. This is how Volvo did it for LH....
You think I can reduce the sensitivity further without losing its ability to detect knock at lower rpms and everywhere else? I still have a lot adjustment range left but I was worried about adjusting out real knock...

[Boris740]

The only problem with that for me is that my knock sense light comes on between 4-5k rpm and stays on no matter what. I hear no knocking and my AFR is good. Doesn't matter if im in boost or not.

You can have knock and not hear it. Case in point. I have friend here in town with modified 740T. It was a NA car the he put a turbo on and used Buick pistons. High CR. He was one of the first people to use the original Knocksense and than KnocksenseMS. He always had Knocksense light up at high RPM and we speculated on possibilities because he could not hear it knocking. He could hear knock at low RPM and heavy load. One time he shredded the M46 and Knocksense picked up the racket. Recently he installed a later version of MS&S that has IAT/CLT related ignition timing control. With that in place the knock that he couldn't hear went away. This is not to say the you have the same problem. I can and do take my B230FT to 6300 RPM and it does not knock. I can get it to knock if I load it. If I advance the cam few degrees it gets really knock happy. Try a gallon of Toluene in a half a tank and see if anything changes all other conditions being the same. Try changing the sensor. Sometimes they can crack internally and produce false signals. This is hard to test for.

[ovlov760]

It did the same thing with LH and EZK. I run more timing at lower RPM's and I get nothing even at 20psi. I can try to grab some knock sensors next time i'm at the JY. I've never touched mine or removed it.

[wildmanben]

For the record, which pin is the knock input pin on the MS board?
And do you have to do anything special in the megatune code or the program itself, besides going to spark-->knock system"?
Thanks!
-Ben

[Boris740]

For the record, which pin is the knock input pin on the MS board?
And do you have to do anything special in the megatune code or the program itself, besides going to spark-->knock system"?
Thanks!
-Ben

http://www.viatrack.ca/KnockMS/WiringMS.JPG

Just set the knock control parameters in Knock / system. My first retard is 2° and subsequent retards are 1° Max is 14° Advance is 1° Wait time is 1 sec. If you want to see that it is really working than make the first retard 15° and wait time 15 sec. Instant slug after first knock.

[Magnum TE]

hey boris can we mod your origional knock sence to work, or will this require another monitary investment in new and improved circuit board design.

can we add a BJT or a FET to the output of the LED or something....

[n xntrx volvo]

hey boris can we mod your origional knock sence to work, or will this require another monitary investment in new and improved circuit board design.

can we add a BJT or a FET to the output of the LED or something....
you have to build a small cb. theres a thread around here with it.

[Boris740]

hey boris can we mod your origional knock sence to work, or will this require another monitary investment in new and improved circuit board design.

can we add a BJT or a FET to the output of the LED or something....

You can piggy this circuit on a small perf board.

http://www.viatrack.ca/Misc/MEGAKNOCK.JPG

[Magnum TE]

thank you very much.

[blkaplan]

borris, just want to say GREAT PRODUCT,

i ordred the stand knocksense from you a while back and just got around to installing it, to bad its already obsolete :-( . Why do you improve your products WHY! ;-)

On anything that is MSnS it is absolutely necessary to go with a knock sensor thats visual.

With my car i had no audible ping up above 4000 rpm, (its hard to hear when u get on it with a short intake and 3" side exit exhaust with no mufflers or cats) but the knock sense picked it up and i was able to drop the timing down in the upper areas so that i have no knock.

I know some people say well it stays on all the time, theres a possiblitly that it needs adjustment if you haven't done it right but you could be pinging all the time! i know mine didn't "feel" or "sound" bad but it was pinging and this was traceable only with knocksense. Dropping a lot of timing up in the boost range was the answer, the thing that amazed me was how much timing needed to be pulled @ 6400 rpm , 205 kpa im running like 12 degrees, never thought it would have to be that much.

With the car tuned correctly even with the stock 530 head and the ****ty m cam the thing just keeps reving and pulls really hard.

Borris is there a way to interface my old knocksense with megasquirt or do i need to buy an updated one from you?

I would love to be able to see the knocks on the data log cause its always hard to remember @ exactly what rpm bin and what pressure bin i should be tuning....


Even if i cant for 50 bucks its a kick ass product and anyone who has msns and doesn't have this should shoot themselves in the head cause they are dumb!

Fuel tuning is easy,
Spark Tuning is still tricky but you made it much easier than it was doing it blind.

[ovlov760]

You can piggy this circuit on a small perf board.

http://www.viatrack.ca/Misc/MEGAKNOCK.JPG
This works without a daughterboard? Can it be built and hooked up to a regular MSnS box running-extra?

[Boris740]

This works without a daughterboard? Can it be built and hooked up to a regular MSnS box running-extra?

Yes. Just connect the output to JP1 pin 5. Use 5V on MS board for the 4K7 pullup resistor.