Knock sensor, any other solution? standalone knock sensor log or visual?
 

Hello
Is anyone running something like a standalone knock sensor with a gauge to display knocks or pings? i am just wondering. I have a open wastegate and it gets really loud i am not able to hear anything besides the exhaust. i don't want to blow something up if you know what i mean. i read about some DIY gauges that you can make to display when the knock sensor is activated. would this work for mazda? anyone have one? looking forward for some input.
-jasko

Shouldnt it throw a cel if it picks up knock?

not sure about that one. maybe someone can confirm it.

I use this with the stock '99 sensor. Works like a charm. Just tap it into the stock ECU harness and have fun. Come with an LED so you can "see" when knock occurs. You have to tune it to your sensitivity liking. When connecto to MS you can retard iginition based on knock.

http://viatrack.ca/

As far as I know, only NB's had a knock sensor.

I've been using this for over a year now, great product:

http://www.vividracing.com/catalog/p...ducts_id/15475

looks pretty good but i am talking here a HOME BREW something cheap it don't have to look good just do its job. any other takers?

A question about that device, as it's one I've had my eye on. I want something that I can run into an input on my EMU for logging and spark retard. The documentation for that device shows that it has a knock output line (yellow wire) which is intended for use with their Gameboy-based Dtec-FC piggyback, but they don't describe the function of the wire (signal levels and durations). Do you happen to know what the output of that wire looks like?

For me, it's down to either that or the KnockSenseMS, though I like the fact that the sensativity scales to RPM on the TurboXS unit. On the downside however, the TurboXS unit does not appear to be tunable to the knock frequency of the engine, unlike the KnockSense. Decisions...

hey guys sorry i havent been around i just got married & got back from my honey moon.... (p.s avo kit is now on also :)

the million $ question i would like to ask is why cant we get the knock sensor on the emu to work... & could it somehow be connected to one of these units to retard timing (like a standard ecu) ........

now that would be great :D

The problem: knock logging has been demonstrated to work on the EMU, but there is no provision in the software for knock retard.

The alternative: Find a standalone knock sensor that will be fed into the EMUs AFM input line, and used to drive the IGN2 map.

Gonna try a KnockSenseMS to see how that goes.

really usefull parts...

You can try to get a J&S and see if you can adapt the knock signal to the EMU.

http://www.jandssafeguard.com/

dont mean to steal the thread, but i'm actually looking for one too. i've got an NA though, with EMB. any suggestions on that one?

I think that one has already been done, it's just too damn expensive. The KnockSenseMS is under $100, and I think that for those of us not using the AFM/MAF input on our EMUs (which should be everybody) that you can feed it into that input and drive an IGN map with it.

Any reason not to try it with the stock '99 knock sensor on a '99 motor that will soon live in my 92 with EMU and AFM removed.

*** whenever you mention removing the AFM you have to credit Joe Perez:bowdown:

To put it into the AFM input? Well, the knock sensor itself is really just a very rugged microphone. It outputs a very low amplitude signal, which contains lots of broadband noise. In order to be useful, the signal needs to be run through a preamplifier and filter, to raise the level of the signal and eliminate all noise that is not within the range of potential knock.

That's basically what the KnockSenseMS is, along with a comparator to drive the outputs.

Oh stop... :cool: I realize AFM removal is not for everyone, what I meant is that even if you're running a stock MAF/AFM, there is no compelling need to pass that signal through the EMU, so that input can potentially be freed up on any Miata.

I was just giving you a little grief. I am really happy without my AFM and know how much work you put in to make it possible.

I am wondering how much I am going to have to adjust the Airflow Output Map to compensate for the different flow characteristics of the 99 head being force fed from a 1.2L whipple supercharger.

And to keep this on topic, I guess I will just log the stock knock sensor output.

I'm using the '99 sensor with knocksense. Works fine.

What about the OP and his cheap standalone knock sensor that requires no other aftermarket parts (not everyone runs emanage) There isn't anything cheap that does not need to log or be plugged into a fancy computer or anything?

knocksense or knocklink
your ears work too.

Yup. The original KnockSense will drive an LED. $50, plus $25 for a sensor.

hello
I am planning on getting the Knocksense unit. The guy asked me to supply the engine bore he said "Each unit is individually optimized to the engine bore so please supply the approximate bore size in millimeters" i have a 2001 miata and how can i find that out. He said that he might do a discount if more than 25 people are willing to buy. Anyone interested?

The 1.8 Miata engines have a bore diameter of 83mm.

The 1.6 is 78mm, in case anybody was wondering.

Just buy it straight up. You'll wait a lifetime for 25 people to pony up the money. I mean, you're not talking about big thick aluminum radiators for $160 for hecks sake. :)
The knocksense will work with your stock sensor. The bore doesn't really matter, you have to tune it yourself anyway.

There are two adjustments on the KS- frequency and sensitivity (gain).

Boris sets up the bandpass filter to match the calculated knock frequency of the block before he ships out the unit. Then it's up to the user to adjust the sensitivity once the device is installed.

Good to know, thanks. Guess that's why it's a tuned circuit out of the box :)

ordered one (knocksense) we'll see how it works out. it was 53 shipped. good deal.

lol......sorry i had to, MUSANOVIC is a very good friend of mine
cjernigan, can i apply this to my sig please? i dont know why this makes me laugh so much, am i the only one that found it funny? :rofl:

I have bought older J&S unit with monitor.
Havnt had time for installation yet.

My plan is to measure monitor signal voltage
and adapt this to EMU for ign retard.

Before I will ask J&S guys which voltage range they use
for the LED monitior.


Falk

FM is selling a J&S for $150 with wiring and sensor.

http://www.flyinmiata.com/dealoftheday/

'Tis gone. I sure hope someone here bought it, as that was a great deal.

A MS V2.2 is cheaper than that JS unit. Add a knocksense and you've got some serious engine managment. Not another bandaid.
It was a good deal though.

Yeah, but for someone using an AFPR and not wanting to go full-ECU, it would have been nice. Hell, even I haven't manned up and taken the MS plunge. Yet...

man up!!! lol
i havent even installed my MS yet and im wondering about knocksense
im gonna have to do that, once the motor is built that is, i see no use for it yet

If someone knows the guy who bought the FM J&S,
I have the monitor for this unit and dont use it.

Falk

oh? Is it the nice round monitor or the ugly square one? If it's the round one I might be interested.

Do it Joe. We need someone to build circuits that do all kinds of crazy stuff in the community.

Joe, you're one of the guys I consider a good source of knowledge; no way that I may end up running around with an MS hooked up (mind you one made by my guru Chad:cool:) before you do. You have to take the plunge so I can ask you dumb questions:bowdown:

Speaking of dumb questions: where do I hook up my Knocksense Chad?

Cheers,

Rafa

You've got email Rafa.
I'm no guru, i just build them.

In my book you are. You've already proven than when it comes to Miatas one only has to ask you to get answers. BTW, where do I connect my Knocksense tomorrow?

Thanks

You can get 12v from anywhere you like, i use an Add-a-circuit in the fusebox though i don't know if you can get those locally. You could get 12v off the ignition, stereo, wherever you like. The ground can be anywhere as well though it's best to ground at the stock ECU location at the throttle body for things like that. Not sure how much that matters with the knocksense.
The knocksense has instructions for the LED, i mounted mine on the steering column cover so i can see it easily. The TIM wire should be connected to the KNOCK wire that i labeled on the MS harness. You will be able to see the KS pulling timing in the datalogs.
I'm still no guru, i just spend too much time online.

Ok, got it. Just with the stock ECU's ground by the throttle body. My LED is going in an extra hole they made on my 2 gauge pod (the ones you hate:gay:) above the gauges which is basically in front of my eyes!

The part of the MS harness labeling I had already seen; BTW, great job, the only thing I would need would be for you to write it in Spanish next time:)

hey guys, ive also found this which is big with the wrx market here in australia

http://www.linkecu.com/products/Anci...ices/KnockLink

KnockLink is an LED bar graph display designed for monitoring engine noise, particularly engine knock (detonation / pre-ignition). KnockLink can be used with almost any type of factory knock sensor and has a built in sensitivity adjustment to allow the display to be tailored to any application and engine noise level.

Most modern engines will already have a knock sensor fitted as standard, but any type of knock sensor may be fitted as required. The sensor is normally screwed into a boss on the engine block although some manufacturers fit the sensor in the inlet manifold (especially Ford). In either case, the sensor must be in such a position that block vibrations are coupled to the sensor.

Assuming the engine is operating correctly, the LEDs will show only background noise which will rise in proportion to engine power output. Any abrupt rise in signal level at any time is an indication that detonation is occurring. Early detection of severe detonation can help prevent engine destruction.

Whether installed permanently or used as a temporary diagnostic tool, the KnockLink can help detect detonation / pre-ignition, optimise advance and prevent costly engine failure.

u.s $113
euro $83
Aust $136
kg 0.3

i think its also well priced, what you guys think?????

when i was running 87 on my 01, i would hear some knock during some spirited drives (corners that dropped me out of powerband)... i'd hear it once or twice, then it shuts up... which can only lead me to assume that the knock sensor picked it up and retarded the timing...

now that i decided to invest that extra 15 cents for 91... it doesnt do that anymore

Sorry, its the ugly square one :-)

Falk

can the ebay monitors be.... trusted???